X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/7a98913d0cf74887180aca3520c628a52b0e7071..555a821c3e1b79093b63b96e981c4766cf43baa9:/vendor/assets/iD/iD.js?ds=sidebyside diff --git a/vendor/assets/iD/iD.js b/vendor/assets/iD/iD.js index 11dd2f7b0..8aa803c09 100644 --- a/vendor/assets/iD/iD.js +++ b/vendor/assets/iD/iD.js @@ -1,70963 +1,79178 @@ -(function(exports) { +(function () { +function actionAddEntity(way) { + return function(graph) { + return graph.replace(way); + }; +} - var bootstrap = (typeof exports.bootstrap === "object") ? - exports.bootstrap : - (exports.bootstrap = {}); +var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {}; - bootstrap.tooltip = function() { - var tooltip = function(selection) { - selection.each(setup); - }, - animation = d3.functor(false), - html = d3.functor(false), - title = function() { - var title = this.getAttribute("data-original-title"); - if (title) { - return title; - } else { - title = this.getAttribute("title"); - this.removeAttribute("title"); - this.setAttribute("data-original-title", title); - } - return title; - }, - over = "mouseenter.tooltip", - out = "mouseleave.tooltip", - placements = "top left bottom right".split(" "), - placement = d3.functor("top"); - - tooltip.title = function(_) { - if (arguments.length) { - title = d3.functor(_); - return tooltip; - } else { - return title; - } - }; - tooltip.html = function(_) { - if (arguments.length) { - html = d3.functor(_); - return tooltip; - } else { - return html; - } - }; - tooltip.placement = function(_) { - if (arguments.length) { - placement = d3.functor(_); - return tooltip; - } else { - return placement; - } - }; - tooltip.show = function(selection) { - selection.each(show); - }; +function createCommonjsModule(fn, module) { + return module = { exports: {} }, fn(module, module.exports), module.exports; +} - tooltip.hide = function(selection) { - selection.each(hide); - }; +var lodash = createCommonjsModule(function (module, exports) { +/** + * @license + * Lodash + * Copyright JS Foundation and other contributors + * Released under MIT license + * Based on Underscore.js 1.8.3 + * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors + */ +(function() { + + /** Used as a safe reference for `undefined` in pre-ES5 environments. */ + var undefined; + + /** Used as the semantic version number. */ + var VERSION = '4.17.4'; + + /** Used as the size to enable large array optimizations. */ + var LARGE_ARRAY_SIZE = 200; + + /** Error message constants. */ + var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.', + FUNC_ERROR_TEXT = 'Expected a function'; + + /** Used to stand-in for `undefined` hash values. */ + var HASH_UNDEFINED = '__lodash_hash_undefined__'; + + /** Used as the maximum memoize cache size. */ + var MAX_MEMOIZE_SIZE = 500; + + /** Used as the internal argument placeholder. */ + var PLACEHOLDER = '__lodash_placeholder__'; + + /** Used to compose bitmasks for cloning. */ + var CLONE_DEEP_FLAG = 1, + CLONE_FLAT_FLAG = 2, + CLONE_SYMBOLS_FLAG = 4; + + /** Used to compose bitmasks for value comparisons. */ + var COMPARE_PARTIAL_FLAG = 1, + COMPARE_UNORDERED_FLAG = 2; + + /** Used to compose bitmasks for function metadata. */ + var WRAP_BIND_FLAG = 1, + WRAP_BIND_KEY_FLAG = 2, + WRAP_CURRY_BOUND_FLAG = 4, + WRAP_CURRY_FLAG = 8, + WRAP_CURRY_RIGHT_FLAG = 16, + WRAP_PARTIAL_FLAG = 32, + WRAP_PARTIAL_RIGHT_FLAG = 64, + WRAP_ARY_FLAG = 128, + WRAP_REARG_FLAG = 256, + WRAP_FLIP_FLAG = 512; + + /** Used as default options for `_.truncate`. */ + var DEFAULT_TRUNC_LENGTH = 30, + DEFAULT_TRUNC_OMISSION = '...'; + + /** Used to detect hot functions by number of calls within a span of milliseconds. */ + var HOT_COUNT = 800, + HOT_SPAN = 16; + + /** Used to indicate the type of lazy iteratees. */ + var LAZY_FILTER_FLAG = 1, + LAZY_MAP_FLAG = 2, + LAZY_WHILE_FLAG = 3; + + /** Used as references for various `Number` constants. */ + var INFINITY = 1 / 0, + MAX_SAFE_INTEGER = 9007199254740991, + MAX_INTEGER = 1.7976931348623157e+308, + NAN = 0 / 0; + + /** Used as references for the maximum length and index of an array. */ + var MAX_ARRAY_LENGTH = 4294967295, + MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1, + HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1; + + /** Used to associate wrap methods with their bit flags. */ + var wrapFlags = [ + ['ary', WRAP_ARY_FLAG], + ['bind', WRAP_BIND_FLAG], + ['bindKey', WRAP_BIND_KEY_FLAG], + ['curry', WRAP_CURRY_FLAG], + ['curryRight', WRAP_CURRY_RIGHT_FLAG], + ['flip', WRAP_FLIP_FLAG], + ['partial', WRAP_PARTIAL_FLAG], + ['partialRight', WRAP_PARTIAL_RIGHT_FLAG], + ['rearg', WRAP_REARG_FLAG] + ]; - tooltip.toggle = function(selection) { - selection.each(toggle); - }; + /** `Object#toString` result references. */ + var argsTag = '[object Arguments]', + arrayTag = '[object Array]', + asyncTag = '[object AsyncFunction]', + boolTag = '[object Boolean]', + dateTag = '[object Date]', + domExcTag = '[object DOMException]', + errorTag = '[object Error]', + funcTag = '[object Function]', + genTag = '[object GeneratorFunction]', + mapTag = '[object Map]', + numberTag = '[object Number]', + nullTag = '[object Null]', + objectTag = '[object Object]', + promiseTag = '[object Promise]', + proxyTag = '[object Proxy]', + regexpTag = '[object RegExp]', + setTag = '[object Set]', + stringTag = '[object String]', + symbolTag = '[object Symbol]', + undefinedTag = '[object Undefined]', + weakMapTag = '[object WeakMap]', + weakSetTag = '[object WeakSet]'; + + var arrayBufferTag = '[object ArrayBuffer]', + dataViewTag = '[object DataView]', + float32Tag = '[object Float32Array]', + float64Tag = '[object Float64Array]', + int8Tag = '[object Int8Array]', + int16Tag = '[object Int16Array]', + int32Tag = '[object Int32Array]', + uint8Tag = '[object Uint8Array]', + uint8ClampedTag = '[object Uint8ClampedArray]', + uint16Tag = '[object Uint16Array]', + uint32Tag = '[object Uint32Array]'; + + /** Used to match empty string literals in compiled template source. */ + var reEmptyStringLeading = /\b__p \+= '';/g, + reEmptyStringMiddle = /\b(__p \+=) '' \+/g, + reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; - tooltip.destroy = function(selection) { - selection - .on(over, null) - .on(out, null) - .attr("title", function() { - return this.getAttribute("data-original-title") || this.getAttribute("title"); - }) - .attr("data-original-title", null) - .select(".tooltip") - .remove(); - }; + /** Used to match HTML entities and HTML characters. */ + var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g, + reUnescapedHtml = /[&<>"']/g, + reHasEscapedHtml = RegExp(reEscapedHtml.source), + reHasUnescapedHtml = RegExp(reUnescapedHtml.source); - function setup() { - var root = d3.select(this), - animate = animation.apply(this, arguments), - tip = root.append("div") - .attr("class", "tooltip"); + /** Used to match template delimiters. */ + var reEscape = /<%-([\s\S]+?)%>/g, + reEvaluate = /<%([\s\S]+?)%>/g, + reInterpolate = /<%=([\s\S]+?)%>/g; - if (animate) { - tip.classed("fade", true); - } + /** Used to match property names within property paths. */ + var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/, + reIsPlainProp = /^\w*$/, + reLeadingDot = /^\./, + rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g; - // TODO "inside" checks? + /** + * Used to match `RegExp` + * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns). + */ + var reRegExpChar = /[\\^$.*+?()[\]{}|]/g, + reHasRegExpChar = RegExp(reRegExpChar.source); - tip.append("div") - .attr("class", "tooltip-arrow"); - tip.append("div") - .attr("class", "tooltip-inner"); + /** Used to match leading and trailing whitespace. */ + var reTrim = /^\s+|\s+$/g, + reTrimStart = /^\s+/, + reTrimEnd = /\s+$/; - var place = placement.apply(this, arguments); - tip.classed(place, true); + /** Used to match wrap detail comments. */ + var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/, + reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/, + reSplitDetails = /,? & /; - root.on(over, show); - root.on(out, hide); - } + /** Used to match words composed of alphanumeric characters. */ + var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g; - function show() { - var root = d3.select(this), - content = title.apply(this, arguments), - tip = root.select(".tooltip") - .classed("in", true), - markup = html.apply(this, arguments), - innercontent = tip.select(".tooltip-inner")[markup ? "html" : "text"](content), - place = placement.apply(this, arguments), - outer = getPosition(root.node()), - inner = getPosition(tip.node()), - pos; + /** Used to match backslashes in property paths. */ + var reEscapeChar = /\\(\\)?/g; - switch (place) { - case "top": - pos = {x: outer.x + (outer.w - inner.w) / 2, y: outer.y - inner.h}; - break; - case "right": - pos = {x: outer.x + outer.w, y: outer.y + (outer.h - inner.h) / 2}; - break; - case "left": - pos = {x: outer.x - inner.w, y: outer.y + (outer.h - inner.h) / 2}; - break; - case "bottom": - pos = {x: Math.max(0, outer.x + (outer.w - inner.w) / 2), y: outer.y + outer.h}; - break; - } + /** + * Used to match + * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components). + */ + var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; - tip.style(pos ? - {left: ~~pos.x + "px", top: ~~pos.y + "px"} : - {left: null, top: null}); + /** Used to match `RegExp` flags from their coerced string values. */ + var reFlags = /\w*$/; - this.tooltipVisible = true; - } + /** Used to detect bad signed hexadecimal string values. */ + var reIsBadHex = /^[-+]0x[0-9a-f]+$/i; - function hide() { - d3.select(this).select(".tooltip") - .classed("in", false); + /** Used to detect binary string values. */ + var reIsBinary = /^0b[01]+$/i; - this.tooltipVisible = false; - } + /** Used to detect host constructors (Safari). */ + var reIsHostCtor = /^\[object .+?Constructor\]$/; - function toggle() { - if (this.tooltipVisible) { - hide.apply(this, arguments); - } else { - show.apply(this, arguments); - } - } + /** Used to detect octal string values. */ + var reIsOctal = /^0o[0-7]+$/i; - return tooltip; - }; + /** Used to detect unsigned integer values. */ + var reIsUint = /^(?:0|[1-9]\d*)$/; - function getPosition(node) { - var mode = d3.select(node).style('position'); - if (mode === 'absolute' || mode === 'static') { - return { - x: node.offsetLeft, - y: node.offsetTop, - w: node.offsetWidth, - h: node.offsetHeight - }; - } else { - return { - x: 0, - y: 0, - w: node.offsetWidth, - h: node.offsetHeight - }; - } - } + /** Used to match Latin Unicode letters (excluding mathematical operators). */ + var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g; -})(this); -d3 = (function(){ - var d3 = {version: "3.1.4"}; // semver -d3.ascending = function(a, b) { - return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN; -}; -d3.descending = function(a, b) { - return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN; -}; -d3.min = function(array, f) { - var i = -1, - n = array.length, - a, - b; - if (arguments.length === 1) { - while (++i < n && ((a = array[i]) == null || a != a)) a = undefined; - while (++i < n) if ((b = array[i]) != null && a > b) a = b; - } else { - while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined; - while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b; - } - return a; -}; -d3.max = function(array, f) { - var i = -1, - n = array.length, - a, - b; - if (arguments.length === 1) { - while (++i < n && ((a = array[i]) == null || a != a)) a = undefined; - while (++i < n) if ((b = array[i]) != null && b > a) a = b; - } else { - while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined; - while (++i < n) if ((b = f.call(array, array[i], i)) != null && b > a) a = b; - } - return a; -}; -d3.extent = function(array, f) { - var i = -1, - n = array.length, - a, - b, - c; - if (arguments.length === 1) { - while (++i < n && ((a = c = array[i]) == null || a != a)) a = c = undefined; - while (++i < n) if ((b = array[i]) != null) { - if (a > b) a = b; - if (c < b) c = b; - } - } else { - while (++i < n && ((a = c = f.call(array, array[i], i)) == null || a != a)) a = undefined; - while (++i < n) if ((b = f.call(array, array[i], i)) != null) { - if (a > b) a = b; - if (c < b) c = b; - } - } - return [a, c]; -}; -d3.sum = function(array, f) { - var s = 0, - n = array.length, - a, - i = -1; + /** Used to ensure capturing order of template delimiters. */ + var reNoMatch = /($^)/; - if (arguments.length === 1) { - while (++i < n) if (!isNaN(a = +array[i])) s += a; - } else { - while (++i < n) if (!isNaN(a = +f.call(array, array[i], i))) s += a; - } + /** Used to match unescaped characters in compiled string literals. */ + var reUnescapedString = /['\n\r\u2028\u2029\\]/g; + + /** Used to compose unicode character classes. */ + var rsAstralRange = '\\ud800-\\udfff', + rsComboMarksRange = '\\u0300-\\u036f', + reComboHalfMarksRange = '\\ufe20-\\ufe2f', + rsComboSymbolsRange = '\\u20d0-\\u20ff', + rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange, + rsDingbatRange = '\\u2700-\\u27bf', + rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff', + rsMathOpRange = '\\xac\\xb1\\xd7\\xf7', + rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf', + rsPunctuationRange = '\\u2000-\\u206f', + rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000', + rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde', + rsVarRange = '\\ufe0e\\ufe0f', + rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange; + + /** Used to compose unicode capture groups. */ + var rsApos = "['\u2019]", + rsAstral = '[' + rsAstralRange + ']', + rsBreak = '[' + rsBreakRange + ']', + rsCombo = '[' + rsComboRange + ']', + rsDigits = '\\d+', + rsDingbat = '[' + rsDingbatRange + ']', + rsLower = '[' + rsLowerRange + ']', + rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']', + rsFitz = '\\ud83c[\\udffb-\\udfff]', + rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')', + rsNonAstral = '[^' + rsAstralRange + ']', + rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}', + rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]', + rsUpper = '[' + rsUpperRange + ']', + rsZWJ = '\\u200d'; + + /** Used to compose unicode regexes. */ + var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')', + rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')', + rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?', + rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?', + reOptMod = rsModifier + '?', + rsOptVar = '[' + rsVarRange + ']?', + rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*', + rsOrdLower = '\\d*(?:(?:1st|2nd|3rd|(?![123])\\dth)\\b)', + rsOrdUpper = '\\d*(?:(?:1ST|2ND|3RD|(?![123])\\dTH)\\b)', + rsSeq = rsOptVar + reOptMod + rsOptJoin, + rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq, + rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')'; + + /** Used to match apostrophes. */ + var reApos = RegExp(rsApos, 'g'); - return s; -}; -function d3_number(x) { - return x != null && !isNaN(x); -} + /** + * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and + * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols). + */ + var reComboMark = RegExp(rsCombo, 'g'); + + /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */ + var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g'); + + /** Used to match complex or compound words. */ + var reUnicodeWord = RegExp([ + rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')', + rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')', + rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower, + rsUpper + '+' + rsOptContrUpper, + rsOrdUpper, + rsOrdLower, + rsDigits, + rsEmoji + ].join('|'), 'g'); + + /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */ + var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']'); + + /** Used to detect strings that need a more robust regexp to match words. */ + var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/; + + /** Used to assign default `context` object properties. */ + var contextProps = [ + 'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array', + 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object', + 'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array', + 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap', + '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout' + ]; -d3.mean = function(array, f) { - var n = array.length, - a, - m = 0, - i = -1, - j = 0; - if (arguments.length === 1) { - while (++i < n) if (d3_number(a = array[i])) m += (a - m) / ++j; - } else { - while (++i < n) if (d3_number(a = f.call(array, array[i], i))) m += (a - m) / ++j; - } - return j ? m : undefined; -}; -// R-7 per -d3.quantile = function(values, p) { - var H = (values.length - 1) * p + 1, - h = Math.floor(H), - v = +values[h - 1], - e = H - h; - return e ? v + e * (values[h] - v) : v; -}; + /** Used to make template sourceURLs easier to identify. */ + var templateCounter = -1; + + /** Used to identify `toStringTag` values of typed arrays. */ + var typedArrayTags = {}; + typedArrayTags[float32Tag] = typedArrayTags[float64Tag] = + typedArrayTags[int8Tag] = typedArrayTags[int16Tag] = + typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] = + typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] = + typedArrayTags[uint32Tag] = true; + typedArrayTags[argsTag] = typedArrayTags[arrayTag] = + typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] = + typedArrayTags[dataViewTag] = typedArrayTags[dateTag] = + typedArrayTags[errorTag] = typedArrayTags[funcTag] = + typedArrayTags[mapTag] = typedArrayTags[numberTag] = + typedArrayTags[objectTag] = typedArrayTags[regexpTag] = + typedArrayTags[setTag] = typedArrayTags[stringTag] = + typedArrayTags[weakMapTag] = false; + + /** Used to identify `toStringTag` values supported by `_.clone`. */ + var cloneableTags = {}; + cloneableTags[argsTag] = cloneableTags[arrayTag] = + cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] = + cloneableTags[boolTag] = cloneableTags[dateTag] = + cloneableTags[float32Tag] = cloneableTags[float64Tag] = + cloneableTags[int8Tag] = cloneableTags[int16Tag] = + cloneableTags[int32Tag] = cloneableTags[mapTag] = + cloneableTags[numberTag] = cloneableTags[objectTag] = + cloneableTags[regexpTag] = cloneableTags[setTag] = + cloneableTags[stringTag] = cloneableTags[symbolTag] = + cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] = + cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true; + cloneableTags[errorTag] = cloneableTags[funcTag] = + cloneableTags[weakMapTag] = false; + + /** Used to map Latin Unicode letters to basic Latin letters. */ + var deburredLetters = { + // Latin-1 Supplement block. + '\xc0': 'A', '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A', + '\xe0': 'a', '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a', + '\xc7': 'C', '\xe7': 'c', + '\xd0': 'D', '\xf0': 'd', + '\xc8': 'E', '\xc9': 'E', '\xca': 'E', '\xcb': 'E', + '\xe8': 'e', '\xe9': 'e', '\xea': 'e', '\xeb': 'e', + '\xcc': 'I', '\xcd': 'I', '\xce': 'I', '\xcf': 'I', + '\xec': 'i', '\xed': 'i', '\xee': 'i', '\xef': 'i', + '\xd1': 'N', '\xf1': 'n', + '\xd2': 'O', '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O', + '\xf2': 'o', '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o', + '\xd9': 'U', '\xda': 'U', '\xdb': 'U', '\xdc': 'U', + '\xf9': 'u', '\xfa': 'u', '\xfb': 'u', '\xfc': 'u', + '\xdd': 'Y', '\xfd': 'y', '\xff': 'y', + '\xc6': 'Ae', '\xe6': 'ae', + '\xde': 'Th', '\xfe': 'th', + '\xdf': 'ss', + // Latin Extended-A block. + '\u0100': 'A', '\u0102': 'A', '\u0104': 'A', + '\u0101': 'a', '\u0103': 'a', '\u0105': 'a', + '\u0106': 'C', '\u0108': 'C', '\u010a': 'C', '\u010c': 'C', + '\u0107': 'c', '\u0109': 'c', '\u010b': 'c', '\u010d': 'c', + '\u010e': 'D', '\u0110': 'D', '\u010f': 'd', '\u0111': 'd', + '\u0112': 'E', '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E', + '\u0113': 'e', '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e', + '\u011c': 'G', '\u011e': 'G', '\u0120': 'G', '\u0122': 'G', + '\u011d': 'g', '\u011f': 'g', '\u0121': 'g', '\u0123': 'g', + '\u0124': 'H', '\u0126': 'H', '\u0125': 'h', '\u0127': 'h', + '\u0128': 'I', '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I', + '\u0129': 'i', '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i', + '\u0134': 'J', '\u0135': 'j', + '\u0136': 'K', '\u0137': 'k', '\u0138': 'k', + '\u0139': 'L', '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L', + '\u013a': 'l', '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l', + '\u0143': 'N', '\u0145': 'N', '\u0147': 'N', '\u014a': 'N', + '\u0144': 'n', '\u0146': 'n', '\u0148': 'n', '\u014b': 'n', + '\u014c': 'O', '\u014e': 'O', '\u0150': 'O', + '\u014d': 'o', '\u014f': 'o', '\u0151': 'o', + '\u0154': 'R', '\u0156': 'R', '\u0158': 'R', + '\u0155': 'r', '\u0157': 'r', '\u0159': 'r', + '\u015a': 'S', '\u015c': 'S', '\u015e': 'S', '\u0160': 'S', + '\u015b': 's', '\u015d': 's', '\u015f': 's', '\u0161': 's', + '\u0162': 'T', '\u0164': 'T', '\u0166': 'T', + '\u0163': 't', '\u0165': 't', '\u0167': 't', + '\u0168': 'U', '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U', + '\u0169': 'u', '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u', + '\u0174': 'W', '\u0175': 'w', + '\u0176': 'Y', '\u0177': 'y', '\u0178': 'Y', + '\u0179': 'Z', '\u017b': 'Z', '\u017d': 'Z', + '\u017a': 'z', '\u017c': 'z', '\u017e': 'z', + '\u0132': 'IJ', '\u0133': 'ij', + '\u0152': 'Oe', '\u0153': 'oe', + '\u0149': "'n", '\u017f': 's' + }; -d3.median = function(array, f) { - if (arguments.length > 1) array = array.map(f); - array = array.filter(d3_number); - return array.length ? d3.quantile(array.sort(d3.ascending), .5) : undefined; -}; -d3.bisector = function(f) { - return { - left: function(a, x, lo, hi) { - if (arguments.length < 3) lo = 0; - if (arguments.length < 4) hi = a.length; - while (lo < hi) { - var mid = lo + hi >>> 1; - if (f.call(a, a[mid], mid) < x) lo = mid + 1; - else hi = mid; - } - return lo; - }, - right: function(a, x, lo, hi) { - if (arguments.length < 3) lo = 0; - if (arguments.length < 4) hi = a.length; - while (lo < hi) { - var mid = lo + hi >>> 1; - if (x < f.call(a, a[mid], mid)) hi = mid; - else lo = mid + 1; - } - return lo; - } + /** Used to map characters to HTML entities. */ + var htmlEscapes = { + '&': '&', + '<': '<', + '>': '>', + '"': '"', + "'": ''' }; -}; -var d3_bisector = d3.bisector(function(d) { return d; }); -d3.bisectLeft = d3_bisector.left; -d3.bisect = d3.bisectRight = d3_bisector.right; -d3.shuffle = function(array) { - var m = array.length, t, i; - while (m) { - i = Math.random() * m-- | 0; - t = array[m], array[m] = array[i], array[i] = t; - } - return array; -}; -d3.permute = function(array, indexes) { - var permutes = [], - i = -1, - n = indexes.length; - while (++i < n) permutes[i] = array[indexes[i]]; - return permutes; -}; + /** Used to map HTML entities to characters. */ + var htmlUnescapes = { + '&': '&', + '<': '<', + '>': '>', + '"': '"', + ''': "'" + }; -d3.zip = function() { - if (!(n = arguments.length)) return []; - for (var i = -1, m = d3.min(arguments, d3_zipLength), zips = new Array(m); ++i < m;) { - for (var j = -1, n, zip = zips[i] = new Array(n); ++j < n;) { - zip[j] = arguments[j][i]; - } - } - return zips; -}; + /** Used to escape characters for inclusion in compiled string literals. */ + var stringEscapes = { + '\\': '\\', + "'": "'", + '\n': 'n', + '\r': 'r', + '\u2028': 'u2028', + '\u2029': 'u2029' + }; -function d3_zipLength(d) { - return d.length; -} + /** Built-in method references without a dependency on `root`. */ + var freeParseFloat = parseFloat, + freeParseInt = parseInt; -d3.transpose = function(matrix) { - return d3.zip.apply(d3, matrix); -}; -d3.keys = function(map) { - var keys = []; - for (var key in map) keys.push(key); - return keys; -}; -d3.values = function(map) { - var values = []; - for (var key in map) values.push(map[key]); - return values; -}; -d3.entries = function(map) { - var entries = []; - for (var key in map) entries.push({key: key, value: map[key]}); - return entries; -}; -d3.merge = function(arrays) { - return Array.prototype.concat.apply([], arrays); -}; -d3.range = function(start, stop, step) { - if (arguments.length < 3) { - step = 1; - if (arguments.length < 2) { - stop = start; - start = 0; - } - } - if ((stop - start) / step === Infinity) throw new Error("infinite range"); - var range = [], - k = d3_range_integerScale(Math.abs(step)), - i = -1, - j; - start *= k, stop *= k, step *= k; - if (step < 0) while ((j = start + step * ++i) > stop) range.push(j / k); - else while ((j = start + step * ++i) < stop) range.push(j / k); - return range; -}; + /** Detect free variable `global` from Node.js. */ + var freeGlobal = typeof commonjsGlobal == 'object' && commonjsGlobal && commonjsGlobal.Object === Object && commonjsGlobal; -function d3_range_integerScale(x) { - var k = 1; - while (x * k % 1) k *= 10; - return k; -} -function d3_class(ctor, properties) { - try { - for (var key in properties) { - Object.defineProperty(ctor.prototype, key, { - value: properties[key], - enumerable: false - }); - } - } catch (e) { - ctor.prototype = properties; - } -} + /** Detect free variable `self`. */ + var freeSelf = typeof self == 'object' && self && self.Object === Object && self; -d3.map = function(object) { - var map = new d3_Map; - for (var key in object) map.set(key, object[key]); - return map; -}; + /** Used as a reference to the global object. */ + var root = freeGlobal || freeSelf || Function('return this')(); -function d3_Map() {} + /** Detect free variable `exports`. */ + var freeExports = 'object' == 'object' && exports && !exports.nodeType && exports; -d3_class(d3_Map, { - has: function(key) { - return d3_map_prefix + key in this; - }, - get: function(key) { - return this[d3_map_prefix + key]; - }, - set: function(key, value) { - return this[d3_map_prefix + key] = value; - }, - remove: function(key) { - key = d3_map_prefix + key; - return key in this && delete this[key]; - }, - keys: function() { - var keys = []; - this.forEach(function(key) { keys.push(key); }); - return keys; - }, - values: function() { - var values = []; - this.forEach(function(key, value) { values.push(value); }); - return values; - }, - entries: function() { - var entries = []; - this.forEach(function(key, value) { entries.push({key: key, value: value}); }); - return entries; - }, - forEach: function(f) { - for (var key in this) { - if (key.charCodeAt(0) === d3_map_prefixCode) { - f.call(this, key.substring(1), this[key]); - } - } - } -}); + /** Detect free variable `module`. */ + var freeModule = freeExports && 'object' == 'object' && module && !module.nodeType && module; -var d3_map_prefix = "\0", // prevent collision with built-ins - d3_map_prefixCode = d3_map_prefix.charCodeAt(0); + /** Detect the popular CommonJS extension `module.exports`. */ + var moduleExports = freeModule && freeModule.exports === freeExports; -d3.nest = function() { - var nest = {}, - keys = [], - sortKeys = [], - sortValues, - rollup; + /** Detect free variable `process` from Node.js. */ + var freeProcess = moduleExports && freeGlobal.process; - function map(mapType, array, depth) { - if (depth >= keys.length) return rollup - ? rollup.call(nest, array) : (sortValues - ? array.sort(sortValues) - : array); + /** Used to access faster Node.js helpers. */ + var nodeUtil = (function() { + try { + return freeProcess && freeProcess.binding && freeProcess.binding('util'); + } catch (e) {} + }()); + + /* Node.js helper references. */ + var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer, + nodeIsDate = nodeUtil && nodeUtil.isDate, + nodeIsMap = nodeUtil && nodeUtil.isMap, + nodeIsRegExp = nodeUtil && nodeUtil.isRegExp, + nodeIsSet = nodeUtil && nodeUtil.isSet, + nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray; - var i = -1, - n = array.length, - key = keys[depth++], - keyValue, - object, - setter, - valuesByKey = new d3_Map, - values; + /*--------------------------------------------------------------------------*/ - while (++i < n) { - if (values = valuesByKey.get(keyValue = key(object = array[i]))) { - values.push(object); - } else { - valuesByKey.set(keyValue, [object]); - } - } + /** + * Adds the key-value `pair` to `map`. + * + * @private + * @param {Object} map The map to modify. + * @param {Array} pair The key-value pair to add. + * @returns {Object} Returns `map`. + */ + function addMapEntry(map, pair) { + // Don't return `map.set` because it's not chainable in IE 11. + map.set(pair[0], pair[1]); + return map; + } - if (mapType) { - object = mapType(); - setter = function(keyValue, values) { - object.set(keyValue, map(mapType, values, depth)); - }; - } else { - object = {}; - setter = function(keyValue, values) { - object[keyValue] = map(mapType, values, depth); - }; - } + /** + * Adds `value` to `set`. + * + * @private + * @param {Object} set The set to modify. + * @param {*} value The value to add. + * @returns {Object} Returns `set`. + */ + function addSetEntry(set, value) { + // Don't return `set.add` because it's not chainable in IE 11. + set.add(value); + return set; + } - valuesByKey.forEach(setter); - return object; + /** + * A faster alternative to `Function#apply`, this function invokes `func` + * with the `this` binding of `thisArg` and the arguments of `args`. + * + * @private + * @param {Function} func The function to invoke. + * @param {*} thisArg The `this` binding of `func`. + * @param {Array} args The arguments to invoke `func` with. + * @returns {*} Returns the result of `func`. + */ + function apply(func, thisArg, args) { + switch (args.length) { + case 0: return func.call(thisArg); + case 1: return func.call(thisArg, args[0]); + case 2: return func.call(thisArg, args[0], args[1]); + case 3: return func.call(thisArg, args[0], args[1], args[2]); + } + return func.apply(thisArg, args); } - function entries(map, depth) { - if (depth >= keys.length) return map; + /** + * A specialized version of `baseAggregator` for arrays. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} setter The function to set `accumulator` values. + * @param {Function} iteratee The iteratee to transform keys. + * @param {Object} accumulator The initial aggregated object. + * @returns {Function} Returns `accumulator`. + */ + function arrayAggregator(array, setter, iteratee, accumulator) { + var index = -1, + length = array == null ? 0 : array.length; - var array = [], - sortKey = sortKeys[depth++]; + while (++index < length) { + var value = array[index]; + setter(accumulator, value, iteratee(value), array); + } + return accumulator; + } - map.forEach(function(key, keyMap) { - array.push({key: key, values: entries(keyMap, depth)}); - }); + /** + * A specialized version of `_.forEach` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns `array`. + */ + function arrayEach(array, iteratee) { + var index = -1, + length = array == null ? 0 : array.length; - return sortKey - ? array.sort(function(a, b) { return sortKey(a.key, b.key); }) - : array; + while (++index < length) { + if (iteratee(array[index], index, array) === false) { + break; + } + } + return array; } - nest.map = function(array, mapType) { - return map(mapType, array, 0); - }; + /** + * A specialized version of `_.forEachRight` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns `array`. + */ + function arrayEachRight(array, iteratee) { + var length = array == null ? 0 : array.length; - nest.entries = function(array) { - return entries(map(d3.map, array, 0), 0); - }; - - nest.key = function(d) { - keys.push(d); - return nest; - }; - - // Specifies the order for the most-recently specified key. - // Note: only applies to entries. Map keys are unordered! - nest.sortKeys = function(order) { - sortKeys[keys.length - 1] = order; - return nest; - }; - - // Specifies the order for leaf values. - // Applies to both maps and entries array. - nest.sortValues = function(order) { - sortValues = order; - return nest; - }; - - nest.rollup = function(f) { - rollup = f; - return nest; - }; - - return nest; -}; - -d3.set = function(array) { - var set = new d3_Set(); - if (array) for (var i = 0; i < array.length; i++) set.add(array[i]); - return set; -}; - -function d3_Set() {} - -d3_class(d3_Set, { - has: function(value) { - return d3_map_prefix + value in this; - }, - add: function(value) { - this[d3_map_prefix + value] = true; - return value; - }, - remove: function(value) { - value = d3_map_prefix + value; - return value in this && delete this[value]; - }, - values: function() { - var values = []; - this.forEach(function(value) { - values.push(value); - }); - return values; - }, - forEach: function(f) { - for (var value in this) { - if (value.charCodeAt(0) === d3_map_prefixCode) { - f.call(this, value.substring(1)); + while (length--) { + if (iteratee(array[length], length, array) === false) { + break; } } + return array; } -}); -d3.behavior = {}; -var d3_document = document, - d3_window = window; -// Copies a variable number of methods from source to target. -d3.rebind = function(target, source) { - var i = 1, n = arguments.length, method; - while (++i < n) target[method = arguments[i]] = d3_rebind(target, source, source[method]); - return target; -}; - -// Method is assumed to be a standard D3 getter-setter: -// If passed with no arguments, gets the value. -// If passed with arguments, sets the value and returns the target. -function d3_rebind(target, source, method) { - return function() { - var value = method.apply(source, arguments); - return value === source ? target : value; - }; -} - -d3.dispatch = function() { - var dispatch = new d3_dispatch, - i = -1, - n = arguments.length; - while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch); - return dispatch; -}; - -function d3_dispatch() {} -d3_dispatch.prototype.on = function(type, listener) { - var i = type.indexOf("."), - name = ""; + /** + * A specialized version of `_.every` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {boolean} Returns `true` if all elements pass the predicate check, + * else `false`. + */ + function arrayEvery(array, predicate) { + var index = -1, + length = array == null ? 0 : array.length; - // Extract optional namespace, e.g., "click.foo" - if (i >= 0) { - name = type.substring(i + 1); - type = type.substring(0, i); + while (++index < length) { + if (!predicate(array[index], index, array)) { + return false; + } + } + return true; } - if (type) return arguments.length < 2 - ? this[type].on(name) - : this[type].on(name, listener); + /** + * A specialized version of `_.filter` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + */ + function arrayFilter(array, predicate) { + var index = -1, + length = array == null ? 0 : array.length, + resIndex = 0, + result = []; - if (arguments.length === 2) { - if (listener == null) for (type in this) { - if (this.hasOwnProperty(type)) this[type].on(name, null); + while (++index < length) { + var value = array[index]; + if (predicate(value, index, array)) { + result[resIndex++] = value; + } } - return this; + return result; } -}; -function d3_dispatch_event(dispatch) { - var listeners = [], - listenerByName = new d3_Map; - - function event() { - var z = listeners, // defensive reference - i = -1, - n = z.length, - l; - while (++i < n) if (l = z[i].on) l.apply(this, arguments); - return dispatch; + /** + * A specialized version of `_.includes` for arrays without support for + * specifying an index to search from. + * + * @private + * @param {Array} [array] The array to inspect. + * @param {*} target The value to search for. + * @returns {boolean} Returns `true` if `target` is found, else `false`. + */ + function arrayIncludes(array, value) { + var length = array == null ? 0 : array.length; + return !!length && baseIndexOf(array, value, 0) > -1; } - event.on = function(name, listener) { - var l = listenerByName.get(name), - i; - - // return the current listener, if any - if (arguments.length < 2) return l && l.on; - - // remove the old listener, if any (with copy-on-write) - if (l) { - l.on = null; - listeners = listeners.slice(0, i = listeners.indexOf(l)).concat(listeners.slice(i + 1)); - listenerByName.remove(name); - } - - // add the new listener, if any - if (listener) listeners.push(listenerByName.set(name, {on: listener})); - - return dispatch; - }; - - return event; -} - -d3.event = null; - -function d3_eventCancel() { - d3.event.stopPropagation(); - d3.event.preventDefault(); -} - -function d3_eventSource() { - var e = d3.event, s; - while (s = e.sourceEvent) e = s; - return e; -} + /** + * This function is like `arrayIncludes` except that it accepts a comparator. + * + * @private + * @param {Array} [array] The array to inspect. + * @param {*} target The value to search for. + * @param {Function} comparator The comparator invoked per element. + * @returns {boolean} Returns `true` if `target` is found, else `false`. + */ + function arrayIncludesWith(array, value, comparator) { + var index = -1, + length = array == null ? 0 : array.length; -// Like d3.dispatch, but for custom events abstracting native UI events. These -// events have a target component (such as a brush), a target element (such as -// the svg:g element containing the brush) and the standard arguments `d` (the -// target element's data) and `i` (the selection index of the target element). -function d3_eventDispatch(target) { - var dispatch = new d3_dispatch, - i = 0, - n = arguments.length; - - while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch); - - // Creates a dispatch context for the specified `thiz` (typically, the target - // DOM element that received the source event) and `argumentz` (typically, the - // data `d` and index `i` of the target element). The returned function can be - // used to dispatch an event to any registered listeners; the function takes a - // single argument as input, being the event to dispatch. The event must have - // a "type" attribute which corresponds to a type registered in the - // constructor. This context will automatically populate the "sourceEvent" and - // "target" attributes of the event, as well as setting the `d3.event` global - // for the duration of the notification. - dispatch.of = function(thiz, argumentz) { - return function(e1) { - try { - var e0 = - e1.sourceEvent = d3.event; - e1.target = target; - d3.event = e1; - dispatch[e1.type].apply(thiz, argumentz); - } finally { - d3.event = e0; + while (++index < length) { + if (comparator(value, array[index])) { + return true; } - }; - }; - - return dispatch; -} - -d3.mouse = function(container) { - return d3_mousePoint(container, d3_eventSource()); -}; - -// https://bugs.webkit.org/show_bug.cgi?id=44083 -var d3_mouse_bug44083 = /WebKit/.test(d3_window.navigator.userAgent) ? -1 : 0; - -function d3_mousePoint(container, e) { - var svg = container.ownerSVGElement || container; - if (svg.createSVGPoint) { - var point = svg.createSVGPoint(); - if (d3_mouse_bug44083 < 0 && (d3_window.scrollX || d3_window.scrollY)) { - svg = d3.select(d3_document.body).append("svg") - .style("position", "absolute") - .style("top", 0) - .style("left", 0); - var ctm = svg[0][0].getScreenCTM(); - d3_mouse_bug44083 = !(ctm.f || ctm.e); - svg.remove(); - } - if (d3_mouse_bug44083) { - point.x = e.pageX; - point.y = e.pageY; - } else { - point.x = e.clientX; - point.y = e.clientY; } - point = point.matrixTransform(container.getScreenCTM().inverse()); - return [point.x, point.y]; + return false; } - var rect = container.getBoundingClientRect(); - return [e.clientX - rect.left - container.clientLeft, e.clientY - rect.top - container.clientTop]; -}; - -var d3_array = d3_arraySlice; // conversion for NodeLists - -function d3_arrayCopy(pseudoarray) { - var i = -1, n = pseudoarray.length, array = []; - while (++i < n) array.push(pseudoarray[i]); - return array; -} - -function d3_arraySlice(pseudoarray) { - return Array.prototype.slice.call(pseudoarray); -} - -try { - d3_array(d3_document.documentElement.childNodes)[0].nodeType; -} catch(e) { - d3_array = d3_arrayCopy; -} - -var d3_arraySubclass = [].__proto__? - -// Until ECMAScript supports array subclassing, prototype injection works well. -function(array, prototype) { - array.__proto__ = prototype; -}: - -// And if your browser doesn't support __proto__, we'll use direct extension. -function(array, prototype) { - for (var property in prototype) array[property] = prototype[property]; -}; - -d3.touches = function(container, touches) { - if (arguments.length < 2) touches = d3_eventSource().touches; - return touches ? d3_array(touches).map(function(touch) { - var point = d3_mousePoint(container, touch); - point.identifier = touch.identifier; - return point; - }) : []; -}; - -function d3_selection(groups) { - d3_arraySubclass(groups, d3_selectionPrototype); - return groups; -} - -var d3_select = function(s, n) { return n.querySelector(s); }, - d3_selectAll = function(s, n) { return n.querySelectorAll(s); }, - d3_selectRoot = d3_document.documentElement, - d3_selectMatcher = d3_selectRoot.matchesSelector || d3_selectRoot.webkitMatchesSelector || d3_selectRoot.mozMatchesSelector || d3_selectRoot.msMatchesSelector || d3_selectRoot.oMatchesSelector, - d3_selectMatches = function(n, s) { return d3_selectMatcher.call(n, s); }; - -// Prefer Sizzle, if available. -if (typeof Sizzle === "function") { - d3_select = function(s, n) { return Sizzle(s, n)[0] || null; }; - d3_selectAll = function(s, n) { return Sizzle.uniqueSort(Sizzle(s, n)); }; - d3_selectMatches = Sizzle.matchesSelector; -} - -var d3_selectionPrototype = []; - -d3.selection = function() { - return d3_selectionRoot; -}; -d3.selection.prototype = d3_selectionPrototype; - - -d3_selectionPrototype.select = function(selector) { - var subgroups = [], - subgroup, - subnode, - group, - node; - - if (typeof selector !== "function") selector = d3_selection_selector(selector); + /** + * A specialized version of `_.map` for arrays without support for iteratee + * shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns the new mapped array. + */ + function arrayMap(array, iteratee) { + var index = -1, + length = array == null ? 0 : array.length, + result = Array(length); - for (var j = -1, m = this.length; ++j < m;) { - subgroups.push(subgroup = []); - subgroup.parentNode = (group = this[j]).parentNode; - for (var i = -1, n = group.length; ++i < n;) { - if (node = group[i]) { - subgroup.push(subnode = selector.call(node, node.__data__, i)); - if (subnode && "__data__" in node) subnode.__data__ = node.__data__; - } else { - subgroup.push(null); - } + while (++index < length) { + result[index] = iteratee(array[index], index, array); } + return result; } - return d3_selection(subgroups); -}; - -function d3_selection_selector(selector) { - return function() { - return d3_select(selector, this); - }; -} - -d3_selectionPrototype.selectAll = function(selector) { - var subgroups = [], - subgroup, - node; - - if (typeof selector !== "function") selector = d3_selection_selectorAll(selector); + /** + * Appends the elements of `values` to `array`. + * + * @private + * @param {Array} array The array to modify. + * @param {Array} values The values to append. + * @returns {Array} Returns `array`. + */ + function arrayPush(array, values) { + var index = -1, + length = values.length, + offset = array.length; - for (var j = -1, m = this.length; ++j < m;) { - for (var group = this[j], i = -1, n = group.length; ++i < n;) { - if (node = group[i]) { - subgroups.push(subgroup = d3_array(selector.call(node, node.__data__, i))); - subgroup.parentNode = node; - } + while (++index < length) { + array[offset + index] = values[index]; } + return array; } - return d3_selection(subgroups); -}; + /** + * A specialized version of `_.reduce` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {*} [accumulator] The initial value. + * @param {boolean} [initAccum] Specify using the first element of `array` as + * the initial value. + * @returns {*} Returns the accumulated value. + */ + function arrayReduce(array, iteratee, accumulator, initAccum) { + var index = -1, + length = array == null ? 0 : array.length; -function d3_selection_selectorAll(selector) { - return function() { - return d3_selectAll(selector, this); - }; -} -var d3_nsPrefix = { - svg: "http://www.w3.org/2000/svg", - xhtml: "http://www.w3.org/1999/xhtml", - xlink: "http://www.w3.org/1999/xlink", - xml: "http://www.w3.org/XML/1998/namespace", - xmlns: "http://www.w3.org/2000/xmlns/" -}; + if (initAccum && length) { + accumulator = array[++index]; + } + while (++index < length) { + accumulator = iteratee(accumulator, array[index], index, array); + } + return accumulator; + } -d3.ns = { - prefix: d3_nsPrefix, - qualify: function(name) { - var i = name.indexOf(":"), - prefix = name; - if (i >= 0) { - prefix = name.substring(0, i); - name = name.substring(i + 1); + /** + * A specialized version of `_.reduceRight` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {*} [accumulator] The initial value. + * @param {boolean} [initAccum] Specify using the last element of `array` as + * the initial value. + * @returns {*} Returns the accumulated value. + */ + function arrayReduceRight(array, iteratee, accumulator, initAccum) { + var length = array == null ? 0 : array.length; + if (initAccum && length) { + accumulator = array[--length]; + } + while (length--) { + accumulator = iteratee(accumulator, array[length], length, array); } - return d3_nsPrefix.hasOwnProperty(prefix) - ? {space: d3_nsPrefix[prefix], local: name} - : name; + return accumulator; } -}; -d3_selectionPrototype.attr = function(name, value) { - if (arguments.length < 2) { + /** + * A specialized version of `_.some` for arrays without support for iteratee + * shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {boolean} Returns `true` if any element passes the predicate check, + * else `false`. + */ + function arraySome(array, predicate) { + var index = -1, + length = array == null ? 0 : array.length; - // For attr(string), return the attribute value for the first node. - if (typeof name === "string") { - var node = this.node(); - name = d3.ns.qualify(name); - return name.local - ? node.getAttributeNS(name.space, name.local) - : node.getAttribute(name); + while (++index < length) { + if (predicate(array[index], index, array)) { + return true; + } } - - // For attr(object), the object specifies the names and values of the - // attributes to set or remove. The values may be functions that are - // evaluated for each element. - for (value in name) this.each(d3_selection_attr(value, name[value])); - return this; + return false; } - return this.each(d3_selection_attr(name, value)); -}; - -function d3_selection_attr(name, value) { - name = d3.ns.qualify(name); + /** + * Gets the size of an ASCII `string`. + * + * @private + * @param {string} string The string inspect. + * @returns {number} Returns the string size. + */ + var asciiSize = baseProperty('length'); - // For attr(string, null), remove the attribute with the specified name. - function attrNull() { - this.removeAttribute(name); - } - function attrNullNS() { - this.removeAttributeNS(name.space, name.local); + /** + * Converts an ASCII `string` to an array. + * + * @private + * @param {string} string The string to convert. + * @returns {Array} Returns the converted array. + */ + function asciiToArray(string) { + return string.split(''); } - // For attr(string, string), set the attribute with the specified name. - function attrConstant() { - this.setAttribute(name, value); - } - function attrConstantNS() { - this.setAttributeNS(name.space, name.local, value); + /** + * Splits an ASCII `string` into an array of its words. + * + * @private + * @param {string} The string to inspect. + * @returns {Array} Returns the words of `string`. + */ + function asciiWords(string) { + return string.match(reAsciiWord) || []; } - // For attr(string, function), evaluate the function for each element, and set - // or remove the attribute as appropriate. - function attrFunction() { - var x = value.apply(this, arguments); - if (x == null) this.removeAttribute(name); - else this.setAttribute(name, x); - } - function attrFunctionNS() { - var x = value.apply(this, arguments); - if (x == null) this.removeAttributeNS(name.space, name.local); - else this.setAttributeNS(name.space, name.local, x); + /** + * The base implementation of methods like `_.findKey` and `_.findLastKey`, + * without support for iteratee shorthands, which iterates over `collection` + * using `eachFunc`. + * + * @private + * @param {Array|Object} collection The collection to inspect. + * @param {Function} predicate The function invoked per iteration. + * @param {Function} eachFunc The function to iterate over `collection`. + * @returns {*} Returns the found element or its key, else `undefined`. + */ + function baseFindKey(collection, predicate, eachFunc) { + var result; + eachFunc(collection, function(value, key, collection) { + if (predicate(value, key, collection)) { + result = key; + return false; + } + }); + return result; } - return value == null - ? (name.local ? attrNullNS : attrNull) : (typeof value === "function" - ? (name.local ? attrFunctionNS : attrFunction) - : (name.local ? attrConstantNS : attrConstant)); -} -function d3_collapse(s) { - return s.trim().replace(/\s+/g, " "); -} -d3.requote = function(s) { - return s.replace(d3_requote_re, "\\$&"); -}; - -var d3_requote_re = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g; - -d3_selectionPrototype.classed = function(name, value) { - if (arguments.length < 2) { + /** + * The base implementation of `_.findIndex` and `_.findLastIndex` without + * support for iteratee shorthands. + * + * @private + * @param {Array} array The array to inspect. + * @param {Function} predicate The function invoked per iteration. + * @param {number} fromIndex The index to search from. + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function baseFindIndex(array, predicate, fromIndex, fromRight) { + var length = array.length, + index = fromIndex + (fromRight ? 1 : -1); - // For classed(string), return true only if the first node has the specified - // class or classes. Note that even if the browser supports DOMTokenList, it - // probably doesn't support it on SVG elements (which can be animated). - if (typeof name === "string") { - var node = this.node(), - n = (name = name.trim().split(/^|\s+/g)).length, - i = -1; - if (value = node.classList) { - while (++i < n) if (!value.contains(name[i])) return false; - } else { - value = node.getAttribute("class"); - while (++i < n) if (!d3_selection_classedRe(name[i]).test(value)) return false; + while ((fromRight ? index-- : ++index < length)) { + if (predicate(array[index], index, array)) { + return index; } - return true; } - - // For classed(object), the object specifies the names of classes to add or - // remove. The values may be functions that are evaluated for each element. - for (value in name) this.each(d3_selection_classed(value, name[value])); - return this; - } - - // Otherwise, both a name and a value are specified, and are handled as below. - return this.each(d3_selection_classed(name, value)); -}; - -function d3_selection_classedRe(name) { - return new RegExp("(?:^|\\s+)" + d3.requote(name) + "(?:\\s+|$)", "g"); -} - -// Multiple class names are allowed (e.g., "foo bar"). -function d3_selection_classed(name, value) { - name = name.trim().split(/\s+/).map(d3_selection_classedName); - var n = name.length; - - function classedConstant() { - var i = -1; - while (++i < n) name[i](this, value); + return -1; } - // When the value is a function, the function is still evaluated only once per - // element even if there are multiple class names. - function classedFunction() { - var i = -1, x = value.apply(this, arguments); - while (++i < n) name[i](this, x); + /** + * The base implementation of `_.indexOf` without `fromIndex` bounds checks. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} fromIndex The index to search from. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function baseIndexOf(array, value, fromIndex) { + return value === value + ? strictIndexOf(array, value, fromIndex) + : baseFindIndex(array, baseIsNaN, fromIndex); } - return typeof value === "function" - ? classedFunction - : classedConstant; -} - -function d3_selection_classedName(name) { - var re = d3_selection_classedRe(name); - return function(node, value) { - if (c = node.classList) return value ? c.add(name) : c.remove(name); - var c = node.getAttribute("class") || ""; - if (value) { - re.lastIndex = 0; - if (!re.test(c)) node.setAttribute("class", d3_collapse(c + " " + name)); - } else { - node.setAttribute("class", d3_collapse(c.replace(re, " "))); - } - }; -} - -d3_selectionPrototype.style = function(name, value, priority) { - var n = arguments.length; - if (n < 3) { + /** + * This function is like `baseIndexOf` except that it accepts a comparator. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} fromIndex The index to search from. + * @param {Function} comparator The comparator invoked per element. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function baseIndexOfWith(array, value, fromIndex, comparator) { + var index = fromIndex - 1, + length = array.length; - // For style(object) or style(object, string), the object specifies the - // names and values of the attributes to set or remove. The values may be - // functions that are evaluated for each element. The optional string - // specifies the priority. - if (typeof name !== "string") { - if (n < 2) value = ""; - for (priority in name) this.each(d3_selection_style(priority, name[priority], value)); - return this; + while (++index < length) { + if (comparator(array[index], value)) { + return index; + } } - - // For style(string), return the computed style value for the first node. - if (n < 2) return d3_window.getComputedStyle(this.node(), null).getPropertyValue(name); - - // For style(string, string) or style(string, function), use the default - // priority. The priority is ignored for style(string, null). - priority = ""; + return -1; } - // Otherwise, a name, value and priority are specified, and handled as below. - return this.each(d3_selection_style(name, value, priority)); -}; + /** + * The base implementation of `_.isNaN` without support for number objects. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`. + */ + function baseIsNaN(value) { + return value !== value; + } -function d3_selection_style(name, value, priority) { + /** + * The base implementation of `_.mean` and `_.meanBy` without support for + * iteratee shorthands. + * + * @private + * @param {Array} array The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {number} Returns the mean. + */ + function baseMean(array, iteratee) { + var length = array == null ? 0 : array.length; + return length ? (baseSum(array, iteratee) / length) : NAN; + } - // For style(name, null) or style(name, null, priority), remove the style - // property with the specified name. The priority is ignored. - function styleNull() { - this.style.removeProperty(name); + /** + * The base implementation of `_.property` without support for deep paths. + * + * @private + * @param {string} key The key of the property to get. + * @returns {Function} Returns the new accessor function. + */ + function baseProperty(key) { + return function(object) { + return object == null ? undefined : object[key]; + }; } - // For style(name, string) or style(name, string, priority), set the style - // property with the specified name, using the specified priority. - function styleConstant() { - this.style.setProperty(name, value, priority); + /** + * The base implementation of `_.propertyOf` without support for deep paths. + * + * @private + * @param {Object} object The object to query. + * @returns {Function} Returns the new accessor function. + */ + function basePropertyOf(object) { + return function(key) { + return object == null ? undefined : object[key]; + }; } - // For style(name, function) or style(name, function, priority), evaluate the - // function for each element, and set or remove the style property as - // appropriate. When setting, use the specified priority. - function styleFunction() { - var x = value.apply(this, arguments); - if (x == null) this.style.removeProperty(name); - else this.style.setProperty(name, x, priority); + /** + * The base implementation of `_.reduce` and `_.reduceRight`, without support + * for iteratee shorthands, which iterates over `collection` using `eachFunc`. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {*} accumulator The initial value. + * @param {boolean} initAccum Specify using the first or last element of + * `collection` as the initial value. + * @param {Function} eachFunc The function to iterate over `collection`. + * @returns {*} Returns the accumulated value. + */ + function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) { + eachFunc(collection, function(value, index, collection) { + accumulator = initAccum + ? (initAccum = false, value) + : iteratee(accumulator, value, index, collection); + }); + return accumulator; } - return value == null - ? styleNull : (typeof value === "function" - ? styleFunction : styleConstant); -} + /** + * The base implementation of `_.sortBy` which uses `comparer` to define the + * sort order of `array` and replaces criteria objects with their corresponding + * values. + * + * @private + * @param {Array} array The array to sort. + * @param {Function} comparer The function to define sort order. + * @returns {Array} Returns `array`. + */ + function baseSortBy(array, comparer) { + var length = array.length; -d3_selectionPrototype.property = function(name, value) { - if (arguments.length < 2) { + array.sort(comparer); + while (length--) { + array[length] = array[length].value; + } + return array; + } - // For property(string), return the property value for the first node. - if (typeof name === "string") return this.node()[name]; + /** + * The base implementation of `_.sum` and `_.sumBy` without support for + * iteratee shorthands. + * + * @private + * @param {Array} array The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {number} Returns the sum. + */ + function baseSum(array, iteratee) { + var result, + index = -1, + length = array.length; - // For property(object), the object specifies the names and values of the - // properties to set or remove. The values may be functions that are - // evaluated for each element. - for (value in name) this.each(d3_selection_property(value, name[value])); - return this; + while (++index < length) { + var current = iteratee(array[index]); + if (current !== undefined) { + result = result === undefined ? current : (result + current); + } + } + return result; } - // Otherwise, both a name and a value are specified, and are handled as below. - return this.each(d3_selection_property(name, value)); -}; - -function d3_selection_property(name, value) { + /** + * The base implementation of `_.times` without support for iteratee shorthands + * or max array length checks. + * + * @private + * @param {number} n The number of times to invoke `iteratee`. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns the array of results. + */ + function baseTimes(n, iteratee) { + var index = -1, + result = Array(n); - // For property(name, null), remove the property with the specified name. - function propertyNull() { - delete this[name]; + while (++index < n) { + result[index] = iteratee(index); + } + return result; } - // For property(name, string), set the property with the specified name. - function propertyConstant() { - this[name] = value; + /** + * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array + * of key-value pairs for `object` corresponding to the property names of `props`. + * + * @private + * @param {Object} object The object to query. + * @param {Array} props The property names to get values for. + * @returns {Object} Returns the key-value pairs. + */ + function baseToPairs(object, props) { + return arrayMap(props, function(key) { + return [key, object[key]]; + }); } - // For property(name, function), evaluate the function for each element, and - // set or remove the property as appropriate. - function propertyFunction() { - var x = value.apply(this, arguments); - if (x == null) delete this[name]; - else this[name] = x; + /** + * The base implementation of `_.unary` without support for storing metadata. + * + * @private + * @param {Function} func The function to cap arguments for. + * @returns {Function} Returns the new capped function. + */ + function baseUnary(func) { + return function(value) { + return func(value); + }; } - return value == null - ? propertyNull : (typeof value === "function" - ? propertyFunction : propertyConstant); -} - -d3_selectionPrototype.text = function(value) { - return arguments.length - ? this.each(typeof value === "function" - ? function() { var v = value.apply(this, arguments); this.textContent = v == null ? "" : v; } : value == null - ? function() { this.textContent = ""; } - : function() { this.textContent = value; }) - : this.node().textContent; -}; - -d3_selectionPrototype.html = function(value) { - return arguments.length - ? this.each(typeof value === "function" - ? function() { var v = value.apply(this, arguments); this.innerHTML = v == null ? "" : v; } : value == null - ? function() { this.innerHTML = ""; } - : function() { this.innerHTML = value; }) - : this.node().innerHTML; -}; - -// TODO append(node)? -// TODO append(function)? -d3_selectionPrototype.append = function(name) { - name = d3.ns.qualify(name); - - function append() { - return this.appendChild(d3_document.createElementNS(this.namespaceURI, name)); + /** + * The base implementation of `_.values` and `_.valuesIn` which creates an + * array of `object` property values corresponding to the property names + * of `props`. + * + * @private + * @param {Object} object The object to query. + * @param {Array} props The property names to get values for. + * @returns {Object} Returns the array of property values. + */ + function baseValues(object, props) { + return arrayMap(props, function(key) { + return object[key]; + }); } - function appendNS() { - return this.appendChild(d3_document.createElementNS(name.space, name.local)); + /** + * Checks if a `cache` value for `key` exists. + * + * @private + * @param {Object} cache The cache to query. + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function cacheHas(cache, key) { + return cache.has(key); } - return this.select(name.local ? appendNS : append); -}; + /** + * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol + * that is not found in the character symbols. + * + * @private + * @param {Array} strSymbols The string symbols to inspect. + * @param {Array} chrSymbols The character symbols to find. + * @returns {number} Returns the index of the first unmatched string symbol. + */ + function charsStartIndex(strSymbols, chrSymbols) { + var index = -1, + length = strSymbols.length; -d3_selectionPrototype.insert = function(name, before) { - name = d3.ns.qualify(name); + while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {} + return index; + } - if (typeof before !== "function") before = d3_selection_selector(before); + /** + * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol + * that is not found in the character symbols. + * + * @private + * @param {Array} strSymbols The string symbols to inspect. + * @param {Array} chrSymbols The character symbols to find. + * @returns {number} Returns the index of the last unmatched string symbol. + */ + function charsEndIndex(strSymbols, chrSymbols) { + var index = strSymbols.length; - function insert(d, i) { - return this.insertBefore( - d3_document.createElementNS(this.namespaceURI, name), - before.call(this, d, i)); + while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {} + return index; } - function insertNS(d, i) { - return this.insertBefore( - d3_document.createElementNS(name.space, name.local), - before.call(this, d, i)); + /** + * Gets the number of `placeholder` occurrences in `array`. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} placeholder The placeholder to search for. + * @returns {number} Returns the placeholder count. + */ + function countHolders(array, placeholder) { + var length = array.length, + result = 0; + + while (length--) { + if (array[length] === placeholder) { + ++result; + } + } + return result; } - return this.select(name.local ? insertNS : insert); -}; + /** + * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A + * letters to basic Latin letters. + * + * @private + * @param {string} letter The matched letter to deburr. + * @returns {string} Returns the deburred letter. + */ + var deburrLetter = basePropertyOf(deburredLetters); -// TODO remove(selector)? -// TODO remove(node)? -// TODO remove(function)? -d3_selectionPrototype.remove = function() { - return this.each(function() { - var parent = this.parentNode; - if (parent) parent.removeChild(this); - }); -}; + /** + * Used by `_.escape` to convert characters to HTML entities. + * + * @private + * @param {string} chr The matched character to escape. + * @returns {string} Returns the escaped character. + */ + var escapeHtmlChar = basePropertyOf(htmlEscapes); -d3_selectionPrototype.data = function(value, key) { - var i = -1, - n = this.length, - group, - node; + /** + * Used by `_.template` to escape characters for inclusion in compiled string literals. + * + * @private + * @param {string} chr The matched character to escape. + * @returns {string} Returns the escaped character. + */ + function escapeStringChar(chr) { + return '\\' + stringEscapes[chr]; + } - // If no value is specified, return the first value. - if (!arguments.length) { - value = new Array(n = (group = this[0]).length); - while (++i < n) { - if (node = group[i]) { - value[i] = node.__data__; - } - } - return value; + /** + * Gets the value at `key` of `object`. + * + * @private + * @param {Object} [object] The object to query. + * @param {string} key The key of the property to get. + * @returns {*} Returns the property value. + */ + function getValue(object, key) { + return object == null ? undefined : object[key]; } - function bind(group, groupData) { - var i, - n = group.length, - m = groupData.length, - n0 = Math.min(n, m), - updateNodes = new Array(m), - enterNodes = new Array(m), - exitNodes = new Array(n), - node, - nodeData; + /** + * Checks if `string` contains Unicode symbols. + * + * @private + * @param {string} string The string to inspect. + * @returns {boolean} Returns `true` if a symbol is found, else `false`. + */ + function hasUnicode(string) { + return reHasUnicode.test(string); + } - if (key) { - var nodeByKeyValue = new d3_Map, - dataByKeyValue = new d3_Map, - keyValues = [], - keyValue; - - for (i = -1; ++i < n;) { - keyValue = key.call(node = group[i], node.__data__, i); - if (nodeByKeyValue.has(keyValue)) { - exitNodes[i] = node; // duplicate selection key - } else { - nodeByKeyValue.set(keyValue, node); - } - keyValues.push(keyValue); - } + /** + * Checks if `string` contains a word composed of Unicode symbols. + * + * @private + * @param {string} string The string to inspect. + * @returns {boolean} Returns `true` if a word is found, else `false`. + */ + function hasUnicodeWord(string) { + return reHasUnicodeWord.test(string); + } - for (i = -1; ++i < m;) { - keyValue = key.call(groupData, nodeData = groupData[i], i); - if (node = nodeByKeyValue.get(keyValue)) { - updateNodes[i] = node; - node.__data__ = nodeData; - } else if (!dataByKeyValue.has(keyValue)) { // no duplicate data key - enterNodes[i] = d3_selection_dataNode(nodeData); - } - dataByKeyValue.set(keyValue, nodeData); - nodeByKeyValue.remove(keyValue); - } + /** + * Converts `iterator` to an array. + * + * @private + * @param {Object} iterator The iterator to convert. + * @returns {Array} Returns the converted array. + */ + function iteratorToArray(iterator) { + var data, + result = []; - for (i = -1; ++i < n;) { - if (nodeByKeyValue.has(keyValues[i])) { - exitNodes[i] = group[i]; - } - } - } else { - for (i = -1; ++i < n0;) { - node = group[i]; - nodeData = groupData[i]; - if (node) { - node.__data__ = nodeData; - updateNodes[i] = node; - } else { - enterNodes[i] = d3_selection_dataNode(nodeData); - } - } - for (; i < m; ++i) { - enterNodes[i] = d3_selection_dataNode(groupData[i]); - } - for (; i < n; ++i) { - exitNodes[i] = group[i]; - } + while (!(data = iterator.next()).done) { + result.push(data.value); } + return result; + } - enterNodes.update - = updateNodes; + /** + * Converts `map` to its key-value pairs. + * + * @private + * @param {Object} map The map to convert. + * @returns {Array} Returns the key-value pairs. + */ + function mapToArray(map) { + var index = -1, + result = Array(map.size); - enterNodes.parentNode - = updateNodes.parentNode - = exitNodes.parentNode - = group.parentNode; + map.forEach(function(value, key) { + result[++index] = [key, value]; + }); + return result; + } - enter.push(enterNodes); - update.push(updateNodes); - exit.push(exitNodes); + /** + * Creates a unary function that invokes `func` with its argument transformed. + * + * @private + * @param {Function} func The function to wrap. + * @param {Function} transform The argument transform. + * @returns {Function} Returns the new function. + */ + function overArg(func, transform) { + return function(arg) { + return func(transform(arg)); + }; } - var enter = d3_selection_enter([]), - update = d3_selection([]), - exit = d3_selection([]); + /** + * Replaces all `placeholder` elements in `array` with an internal placeholder + * and returns an array of their indexes. + * + * @private + * @param {Array} array The array to modify. + * @param {*} placeholder The placeholder to replace. + * @returns {Array} Returns the new array of placeholder indexes. + */ + function replaceHolders(array, placeholder) { + var index = -1, + length = array.length, + resIndex = 0, + result = []; - if (typeof value === "function") { - while (++i < n) { - bind(group = this[i], value.call(group, group.parentNode.__data__, i)); - } - } else { - while (++i < n) { - bind(group = this[i], value); + while (++index < length) { + var value = array[index]; + if (value === placeholder || value === PLACEHOLDER) { + array[index] = PLACEHOLDER; + result[resIndex++] = index; + } } + return result; } - update.enter = function() { return enter; }; - update.exit = function() { return exit; }; - return update; -}; + /** + * Converts `set` to an array of its values. + * + * @private + * @param {Object} set The set to convert. + * @returns {Array} Returns the values. + */ + function setToArray(set) { + var index = -1, + result = Array(set.size); -function d3_selection_dataNode(data) { - return {__data__: data}; -} + set.forEach(function(value) { + result[++index] = value; + }); + return result; + } -d3_selectionPrototype.datum = function(value) { - return arguments.length - ? this.property("__data__", value) - : this.property("__data__"); -}; + /** + * Converts `set` to its value-value pairs. + * + * @private + * @param {Object} set The set to convert. + * @returns {Array} Returns the value-value pairs. + */ + function setToPairs(set) { + var index = -1, + result = Array(set.size); -d3_selectionPrototype.filter = function(filter) { - var subgroups = [], - subgroup, - group, - node; + set.forEach(function(value) { + result[++index] = [value, value]; + }); + return result; + } - if (typeof filter !== "function") filter = d3_selection_filter(filter); + /** + * A specialized version of `_.indexOf` which performs strict equality + * comparisons of values, i.e. `===`. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} fromIndex The index to search from. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function strictIndexOf(array, value, fromIndex) { + var index = fromIndex - 1, + length = array.length; - for (var j = 0, m = this.length; j < m; j++) { - subgroups.push(subgroup = []); - subgroup.parentNode = (group = this[j]).parentNode; - for (var i = 0, n = group.length; i < n; i++) { - if ((node = group[i]) && filter.call(node, node.__data__, i)) { - subgroup.push(node); + while (++index < length) { + if (array[index] === value) { + return index; } } + return -1; } - return d3_selection(subgroups); -}; - -function d3_selection_filter(selector) { - return function() { - return d3_selectMatches(this, selector); - }; -} - -d3_selectionPrototype.order = function() { - for (var j = -1, m = this.length; ++j < m;) { - for (var group = this[j], i = group.length - 1, next = group[i], node; --i >= 0;) { - if (node = group[i]) { - if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next); - next = node; + /** + * A specialized version of `_.lastIndexOf` which performs strict equality + * comparisons of values, i.e. `===`. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} fromIndex The index to search from. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function strictLastIndexOf(array, value, fromIndex) { + var index = fromIndex + 1; + while (index--) { + if (array[index] === value) { + return index; } } + return index; } - return this; -}; -d3_selectionPrototype.sort = function(comparator) { - comparator = d3_selection_sortComparator.apply(this, arguments); - for (var j = -1, m = this.length; ++j < m;) this[j].sort(comparator); - return this.order(); -}; + /** + * Gets the number of symbols in `string`. + * + * @private + * @param {string} string The string to inspect. + * @returns {number} Returns the string size. + */ + function stringSize(string) { + return hasUnicode(string) + ? unicodeSize(string) + : asciiSize(string); + } -function d3_selection_sortComparator(comparator) { - if (!arguments.length) comparator = d3.ascending; - return function(a, b) { - return (!a - !b) || comparator(a.__data__, b.__data__); - }; -} -function d3_noop() {} + /** + * Converts `string` to an array. + * + * @private + * @param {string} string The string to convert. + * @returns {Array} Returns the converted array. + */ + function stringToArray(string) { + return hasUnicode(string) + ? unicodeToArray(string) + : asciiToArray(string); + } -d3_selectionPrototype.on = function(type, listener, capture) { - var n = arguments.length; - if (n < 3) { + /** + * Used by `_.unescape` to convert HTML entities to characters. + * + * @private + * @param {string} chr The matched character to unescape. + * @returns {string} Returns the unescaped character. + */ + var unescapeHtmlChar = basePropertyOf(htmlUnescapes); - // For on(object) or on(object, boolean), the object specifies the event - // types and listeners to add or remove. The optional boolean specifies - // whether the listener captures events. - if (typeof type !== "string") { - if (n < 2) listener = false; - for (capture in type) this.each(d3_selection_on(capture, type[capture], listener)); - return this; + /** + * Gets the size of a Unicode `string`. + * + * @private + * @param {string} string The string inspect. + * @returns {number} Returns the string size. + */ + function unicodeSize(string) { + var result = reUnicode.lastIndex = 0; + while (reUnicode.test(string)) { + ++result; } + return result; + } - // For on(string), return the listener for the first node. - if (n < 2) return (n = this.node()["__on" + type]) && n._; + /** + * Converts a Unicode `string` to an array. + * + * @private + * @param {string} string The string to convert. + * @returns {Array} Returns the converted array. + */ + function unicodeToArray(string) { + return string.match(reUnicode) || []; + } - // For on(string, function), use the default capture. - capture = false; + /** + * Splits a Unicode `string` into an array of its words. + * + * @private + * @param {string} The string to inspect. + * @returns {Array} Returns the words of `string`. + */ + function unicodeWords(string) { + return string.match(reUnicodeWord) || []; } - // Otherwise, a type, listener and capture are specified, and handled as below. - return this.each(d3_selection_on(type, listener, capture)); -}; + /*--------------------------------------------------------------------------*/ + + /** + * Create a new pristine `lodash` function using the `context` object. + * + * @static + * @memberOf _ + * @since 1.1.0 + * @category Util + * @param {Object} [context=root] The context object. + * @returns {Function} Returns a new `lodash` function. + * @example + * + * _.mixin({ 'foo': _.constant('foo') }); + * + * var lodash = _.runInContext(); + * lodash.mixin({ 'bar': lodash.constant('bar') }); + * + * _.isFunction(_.foo); + * // => true + * _.isFunction(_.bar); + * // => false + * + * lodash.isFunction(lodash.foo); + * // => false + * lodash.isFunction(lodash.bar); + * // => true + * + * // Create a suped-up `defer` in Node.js. + * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer; + */ + var runInContext = (function runInContext(context) { + context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps)); + + /** Built-in constructor references. */ + var Array = context.Array, + Date = context.Date, + Error = context.Error, + Function = context.Function, + Math = context.Math, + Object = context.Object, + RegExp = context.RegExp, + String = context.String, + TypeError = context.TypeError; + + /** Used for built-in method references. */ + var arrayProto = Array.prototype, + funcProto = Function.prototype, + objectProto = Object.prototype; + + /** Used to detect overreaching core-js shims. */ + var coreJsData = context['__core-js_shared__']; + + /** Used to resolve the decompiled source of functions. */ + var funcToString = funcProto.toString; + + /** Used to check objects for own properties. */ + var hasOwnProperty = objectProto.hasOwnProperty; + + /** Used to generate unique IDs. */ + var idCounter = 0; + + /** Used to detect methods masquerading as native. */ + var maskSrcKey = (function() { + var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || ''); + return uid ? ('Symbol(src)_1.' + uid) : ''; + }()); -function d3_selection_on(type, listener, capture) { - var name = "__on" + type, - i = type.indexOf("."), - wrap = d3_selection_onListener; + /** + * Used to resolve the + * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring) + * of values. + */ + var nativeObjectToString = objectProto.toString; - if (i > 0) type = type.substring(0, i); - var filter = d3_selection_onFilters.get(type); - if (filter) type = filter, wrap = d3_selection_onFilter; + /** Used to infer the `Object` constructor. */ + var objectCtorString = funcToString.call(Object); - function onRemove() { - var l = this[name]; - if (l) { - this.removeEventListener(type, l, l.$); - delete this[name]; - } - } + /** Used to restore the original `_` reference in `_.noConflict`. */ + var oldDash = root._; - function onAdd() { - var l = wrap(listener, d3_array(arguments)); - if (typeof Raven !== 'undefined') l = Raven.wrap(l); - onRemove.call(this); - this.addEventListener(type, this[name] = l, l.$ = capture); - l._ = listener; - } + /** Used to detect if a method is native. */ + var reIsNative = RegExp('^' + + funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&') + .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$' + ); + + /** Built-in value references. */ + var Buffer = moduleExports ? context.Buffer : undefined, + Symbol = context.Symbol, + Uint8Array = context.Uint8Array, + allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined, + getPrototype = overArg(Object.getPrototypeOf, Object), + objectCreate = Object.create, + propertyIsEnumerable = objectProto.propertyIsEnumerable, + splice = arrayProto.splice, + spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined, + symIterator = Symbol ? Symbol.iterator : undefined, + symToStringTag = Symbol ? Symbol.toStringTag : undefined; + + var defineProperty = (function() { + try { + var func = getNative(Object, 'defineProperty'); + func({}, '', {}); + return func; + } catch (e) {} + }()); + + /** Mocked built-ins. */ + var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout, + ctxNow = Date && Date.now !== root.Date.now && Date.now, + ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout; + + /* Built-in method references for those with the same name as other `lodash` methods. */ + var nativeCeil = Math.ceil, + nativeFloor = Math.floor, + nativeGetSymbols = Object.getOwnPropertySymbols, + nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined, + nativeIsFinite = context.isFinite, + nativeJoin = arrayProto.join, + nativeKeys = overArg(Object.keys, Object), + nativeMax = Math.max, + nativeMin = Math.min, + nativeNow = Date.now, + nativeParseInt = context.parseInt, + nativeRandom = Math.random, + nativeReverse = arrayProto.reverse; + + /* Built-in method references that are verified to be native. */ + var DataView = getNative(context, 'DataView'), + Map = getNative(context, 'Map'), + Promise = getNative(context, 'Promise'), + Set = getNative(context, 'Set'), + WeakMap = getNative(context, 'WeakMap'), + nativeCreate = getNative(Object, 'create'); + + /** Used to store function metadata. */ + var metaMap = WeakMap && new WeakMap; + + /** Used to lookup unminified function names. */ + var realNames = {}; + + /** Used to detect maps, sets, and weakmaps. */ + var dataViewCtorString = toSource(DataView), + mapCtorString = toSource(Map), + promiseCtorString = toSource(Promise), + setCtorString = toSource(Set), + weakMapCtorString = toSource(WeakMap); + + /** Used to convert symbols to primitives and strings. */ + var symbolProto = Symbol ? Symbol.prototype : undefined, + symbolValueOf = symbolProto ? symbolProto.valueOf : undefined, + symbolToString = symbolProto ? symbolProto.toString : undefined; + + /*------------------------------------------------------------------------*/ - function removeAll() { - var re = new RegExp("^__on([^.]+)" + d3.requote(type) + "$"), - match; - for (var name in this) { - if (match = name.match(re)) { - var l = this[name]; - this.removeEventListener(match[1], l, l.$); - delete this[name]; + /** + * Creates a `lodash` object which wraps `value` to enable implicit method + * chain sequences. Methods that operate on and return arrays, collections, + * and functions can be chained together. Methods that retrieve a single value + * or may return a primitive value will automatically end the chain sequence + * and return the unwrapped value. Otherwise, the value must be unwrapped + * with `_#value`. + * + * Explicit chain sequences, which must be unwrapped with `_#value`, may be + * enabled using `_.chain`. + * + * The execution of chained methods is lazy, that is, it's deferred until + * `_#value` is implicitly or explicitly called. + * + * Lazy evaluation allows several methods to support shortcut fusion. + * Shortcut fusion is an optimization to merge iteratee calls; this avoids + * the creation of intermediate arrays and can greatly reduce the number of + * iteratee executions. Sections of a chain sequence qualify for shortcut + * fusion if the section is applied to an array and iteratees accept only + * one argument. The heuristic for whether a section qualifies for shortcut + * fusion is subject to change. + * + * Chaining is supported in custom builds as long as the `_#value` method is + * directly or indirectly included in the build. + * + * In addition to lodash methods, wrappers have `Array` and `String` methods. + * + * The wrapper `Array` methods are: + * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift` + * + * The wrapper `String` methods are: + * `replace` and `split` + * + * The wrapper methods that support shortcut fusion are: + * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`, + * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`, + * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray` + * + * The chainable wrapper methods are: + * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`, + * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`, + * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`, + * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`, + * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`, + * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`, + * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`, + * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`, + * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`, + * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`, + * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`, + * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`, + * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`, + * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`, + * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`, + * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`, + * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`, + * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`, + * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`, + * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`, + * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`, + * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`, + * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`, + * `zipObject`, `zipObjectDeep`, and `zipWith` + * + * The wrapper methods that are **not** chainable by default are: + * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`, + * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`, + * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`, + * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`, + * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`, + * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`, + * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`, + * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`, + * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`, + * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`, + * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`, + * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`, + * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`, + * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`, + * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`, + * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`, + * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`, + * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`, + * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`, + * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`, + * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`, + * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`, + * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`, + * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`, + * `upperFirst`, `value`, and `words` + * + * @name _ + * @constructor + * @category Seq + * @param {*} value The value to wrap in a `lodash` instance. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * function square(n) { + * return n * n; + * } + * + * var wrapped = _([1, 2, 3]); + * + * // Returns an unwrapped value. + * wrapped.reduce(_.add); + * // => 6 + * + * // Returns a wrapped value. + * var squares = wrapped.map(square); + * + * _.isArray(squares); + * // => false + * + * _.isArray(squares.value()); + * // => true + */ + function lodash(value) { + if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) { + if (value instanceof LodashWrapper) { + return value; + } + if (hasOwnProperty.call(value, '__wrapped__')) { + return wrapperClone(value); + } } + return new LodashWrapper(value); } - } - - return i - ? listener ? onAdd : onRemove - : listener ? d3_noop : removeAll; -} - -var d3_selection_onFilters = d3.map({ - mouseenter: "mouseover", - mouseleave: "mouseout" -}); -d3_selection_onFilters.forEach(function(k) { - if ("on" + k in d3_document) d3_selection_onFilters.remove(k); -}); + /** + * The base implementation of `_.create` without support for assigning + * properties to the created object. + * + * @private + * @param {Object} proto The object to inherit from. + * @returns {Object} Returns the new object. + */ + var baseCreate = (function() { + function object() {} + return function(proto) { + if (!isObject(proto)) { + return {}; + } + if (objectCreate) { + return objectCreate(proto); + } + object.prototype = proto; + var result = new object; + object.prototype = undefined; + return result; + }; + }()); -function d3_selection_onListener(listener, argumentz) { - return function(e) { - var o = d3.event; // Events can be reentrant (e.g., focus). - d3.event = e; - argumentz[0] = this.__data__; - try { - listener.apply(this, argumentz); - } finally { - d3.event = o; + /** + * The function whose prototype chain sequence wrappers inherit from. + * + * @private + */ + function baseLodash() { + // No operation performed. } - }; -} -function d3_selection_onFilter(listener, argumentz) { - var l = d3_selection_onListener(listener, argumentz); - return function(e) { - var target = this, related = e.relatedTarget; - if (!related || (related !== target && !(related.compareDocumentPosition(target) & 8))) { - l.call(target, e); + /** + * The base constructor for creating `lodash` wrapper objects. + * + * @private + * @param {*} value The value to wrap. + * @param {boolean} [chainAll] Enable explicit method chain sequences. + */ + function LodashWrapper(value, chainAll) { + this.__wrapped__ = value; + this.__actions__ = []; + this.__chain__ = !!chainAll; + this.__index__ = 0; + this.__values__ = undefined; } - }; -} -d3_selectionPrototype.each = function(callback) { - return d3_selection_each(this, function(node, i, j) { - callback.call(node, node.__data__, i, j); - }); -}; + /** + * By default, the template delimiters used by lodash are like those in + * embedded Ruby (ERB) as well as ES2015 template strings. Change the + * following template settings to use alternative delimiters. + * + * @static + * @memberOf _ + * @type {Object} + */ + lodash.templateSettings = { + + /** + * Used to detect `data` property values to be HTML-escaped. + * + * @memberOf _.templateSettings + * @type {RegExp} + */ + 'escape': reEscape, + + /** + * Used to detect code to be evaluated. + * + * @memberOf _.templateSettings + * @type {RegExp} + */ + 'evaluate': reEvaluate, + + /** + * Used to detect `data` property values to inject. + * + * @memberOf _.templateSettings + * @type {RegExp} + */ + 'interpolate': reInterpolate, + + /** + * Used to reference the data object in the template text. + * + * @memberOf _.templateSettings + * @type {string} + */ + 'variable': '', + + /** + * Used to import variables into the compiled template. + * + * @memberOf _.templateSettings + * @type {Object} + */ + 'imports': { + + /** + * A reference to the `lodash` function. + * + * @memberOf _.templateSettings.imports + * @type {Function} + */ + '_': lodash + } + }; -function d3_selection_each(groups, callback) { - for (var j = 0, m = groups.length; j < m; j++) { - for (var group = groups[j], i = 0, n = group.length, node; i < n; i++) { - if (node = group[i]) callback(node, i, j); - } - } - return groups; -} + // Ensure wrappers are instances of `baseLodash`. + lodash.prototype = baseLodash.prototype; + lodash.prototype.constructor = lodash; -d3_selectionPrototype.call = function(callback) { - var args = d3_array(arguments); - callback.apply(args[0] = this, args); - return this; -}; + LodashWrapper.prototype = baseCreate(baseLodash.prototype); + LodashWrapper.prototype.constructor = LodashWrapper; -d3_selectionPrototype.empty = function() { - return !this.node(); -}; + /*------------------------------------------------------------------------*/ -d3_selectionPrototype.node = function() { - for (var j = 0, m = this.length; j < m; j++) { - for (var group = this[j], i = 0, n = group.length; i < n; i++) { - var node = group[i]; - if (node) return node; + /** + * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation. + * + * @private + * @constructor + * @param {*} value The value to wrap. + */ + function LazyWrapper(value) { + this.__wrapped__ = value; + this.__actions__ = []; + this.__dir__ = 1; + this.__filtered__ = false; + this.__iteratees__ = []; + this.__takeCount__ = MAX_ARRAY_LENGTH; + this.__views__ = []; } - } - return null; -}; -function d3_selection_enter(selection) { - d3_arraySubclass(selection, d3_selection_enterPrototype); - return selection; -} + /** + * Creates a clone of the lazy wrapper object. + * + * @private + * @name clone + * @memberOf LazyWrapper + * @returns {Object} Returns the cloned `LazyWrapper` object. + */ + function lazyClone() { + var result = new LazyWrapper(this.__wrapped__); + result.__actions__ = copyArray(this.__actions__); + result.__dir__ = this.__dir__; + result.__filtered__ = this.__filtered__; + result.__iteratees__ = copyArray(this.__iteratees__); + result.__takeCount__ = this.__takeCount__; + result.__views__ = copyArray(this.__views__); + return result; + } -var d3_selection_enterPrototype = []; + /** + * Reverses the direction of lazy iteration. + * + * @private + * @name reverse + * @memberOf LazyWrapper + * @returns {Object} Returns the new reversed `LazyWrapper` object. + */ + function lazyReverse() { + if (this.__filtered__) { + var result = new LazyWrapper(this); + result.__dir__ = -1; + result.__filtered__ = true; + } else { + result = this.clone(); + result.__dir__ *= -1; + } + return result; + } -d3.selection.enter = d3_selection_enter; -d3.selection.enter.prototype = d3_selection_enterPrototype; + /** + * Extracts the unwrapped value from its lazy wrapper. + * + * @private + * @name value + * @memberOf LazyWrapper + * @returns {*} Returns the unwrapped value. + */ + function lazyValue() { + var array = this.__wrapped__.value(), + dir = this.__dir__, + isArr = isArray(array), + isRight = dir < 0, + arrLength = isArr ? array.length : 0, + view = getView(0, arrLength, this.__views__), + start = view.start, + end = view.end, + length = end - start, + index = isRight ? end : (start - 1), + iteratees = this.__iteratees__, + iterLength = iteratees.length, + resIndex = 0, + takeCount = nativeMin(length, this.__takeCount__); + + if (!isArr || (!isRight && arrLength == length && takeCount == length)) { + return baseWrapperValue(array, this.__actions__); + } + var result = []; + + outer: + while (length-- && resIndex < takeCount) { + index += dir; + + var iterIndex = -1, + value = array[index]; + + while (++iterIndex < iterLength) { + var data = iteratees[iterIndex], + iteratee = data.iteratee, + type = data.type, + computed = iteratee(value); + + if (type == LAZY_MAP_FLAG) { + value = computed; + } else if (!computed) { + if (type == LAZY_FILTER_FLAG) { + continue outer; + } else { + break outer; + } + } + } + result[resIndex++] = value; + } + return result; + } -d3_selection_enterPrototype.append = d3_selectionPrototype.append; -d3_selection_enterPrototype.insert = d3_selectionPrototype.insert; -d3_selection_enterPrototype.empty = d3_selectionPrototype.empty; -d3_selection_enterPrototype.node = d3_selectionPrototype.node; + // Ensure `LazyWrapper` is an instance of `baseLodash`. + LazyWrapper.prototype = baseCreate(baseLodash.prototype); + LazyWrapper.prototype.constructor = LazyWrapper; + /*------------------------------------------------------------------------*/ -d3_selection_enterPrototype.select = function(selector) { - var subgroups = [], - subgroup, - subnode, - upgroup, - group, - node; + /** + * Creates a hash object. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function Hash(entries) { + var index = -1, + length = entries == null ? 0 : entries.length; - for (var j = -1, m = this.length; ++j < m;) { - upgroup = (group = this[j]).update; - subgroups.push(subgroup = []); - subgroup.parentNode = group.parentNode; - for (var i = -1, n = group.length; ++i < n;) { - if (node = group[i]) { - subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i)); - subnode.__data__ = node.__data__; - } else { - subgroup.push(null); + this.clear(); + while (++index < length) { + var entry = entries[index]; + this.set(entry[0], entry[1]); } } - } - return d3_selection(subgroups); -}; + /** + * Removes all key-value entries from the hash. + * + * @private + * @name clear + * @memberOf Hash + */ + function hashClear() { + this.__data__ = nativeCreate ? nativeCreate(null) : {}; + this.size = 0; + } -d3_selectionPrototype.transition = function() { - var id = d3_transitionInheritId || ++d3_transitionId, - subgroups = [], - subgroup, - node, - transition = Object.create(d3_transitionInherit); + /** + * Removes `key` and its value from the hash. + * + * @private + * @name delete + * @memberOf Hash + * @param {Object} hash The hash to modify. + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function hashDelete(key) { + var result = this.has(key) && delete this.__data__[key]; + this.size -= result ? 1 : 0; + return result; + } - transition.time = Date.now(); + /** + * Gets the hash value for `key`. + * + * @private + * @name get + * @memberOf Hash + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function hashGet(key) { + var data = this.__data__; + if (nativeCreate) { + var result = data[key]; + return result === HASH_UNDEFINED ? undefined : result; + } + return hasOwnProperty.call(data, key) ? data[key] : undefined; + } - for (var j = -1, m = this.length; ++j < m;) { - subgroups.push(subgroup = []); - for (var group = this[j], i = -1, n = group.length; ++i < n;) { - if (node = group[i]) d3_transitionNode(node, i, id, transition); - subgroup.push(node); + /** + * Checks if a hash value for `key` exists. + * + * @private + * @name has + * @memberOf Hash + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function hashHas(key) { + var data = this.__data__; + return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key); } - } - return d3_transition(subgroups, id); -}; + /** + * Sets the hash `key` to `value`. + * + * @private + * @name set + * @memberOf Hash + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the hash instance. + */ + function hashSet(key, value) { + var data = this.__data__; + this.size += this.has(key) ? 0 : 1; + data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value; + return this; + } -var d3_selectionRoot = d3_selection([[d3_document]]); + // Add methods to `Hash`. + Hash.prototype.clear = hashClear; + Hash.prototype['delete'] = hashDelete; + Hash.prototype.get = hashGet; + Hash.prototype.has = hashHas; + Hash.prototype.set = hashSet; -d3_selectionRoot[0].parentNode = d3_selectRoot; + /*------------------------------------------------------------------------*/ -// TODO fast singleton implementation! -// TODO select(function) -d3.select = function(selector) { - return typeof selector === "string" - ? d3_selectionRoot.select(selector) - : d3_selection([[selector]]); // assume node -}; + /** + * Creates an list cache object. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function ListCache(entries) { + var index = -1, + length = entries == null ? 0 : entries.length; -// TODO selectAll(function) -d3.selectAll = function(selector) { - return typeof selector === "string" - ? d3_selectionRoot.selectAll(selector) - : d3_selection([d3_array(selector)]); // assume node[] -}; + this.clear(); + while (++index < length) { + var entry = entries[index]; + this.set(entry[0], entry[1]); + } + } -d3.behavior.zoom = function() { - var translate = [0, 0], - translate0, // translate when we started zooming (to avoid drift) - scale = 1, - scale0, // scale when we started touching - scaleExtent = d3_behavior_zoomInfinity, - event = d3_eventDispatch(zoom, "zoom"), - x0, - x1, - y0, - y1, - touchtime; // time of last touchstart (to detect double-tap) + /** + * Removes all key-value entries from the list cache. + * + * @private + * @name clear + * @memberOf ListCache + */ + function listCacheClear() { + this.__data__ = []; + this.size = 0; + } - function zoom() { - this.on("mousedown.zoom", mousedown) - .on("mousemove.zoom", mousemove) - .on(d3_behavior_zoomWheel + ".zoom", mousewheel) - .on("dblclick.zoom", dblclick) - .on("touchstart.zoom", touchstart) - .on("touchmove.zoom", touchmove) - .on("touchend.zoom", touchstart); - } + /** + * Removes `key` and its value from the list cache. + * + * @private + * @name delete + * @memberOf ListCache + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function listCacheDelete(key) { + var data = this.__data__, + index = assocIndexOf(data, key); - zoom.translate = function(x) { - if (!arguments.length) return translate; - translate = x.map(Number); - rescale(); - return zoom; - }; + if (index < 0) { + return false; + } + var lastIndex = data.length - 1; + if (index == lastIndex) { + data.pop(); + } else { + splice.call(data, index, 1); + } + --this.size; + return true; + } - zoom.scale = function(x) { - if (!arguments.length) return scale; - scale = +x; - rescale(); - return zoom; - }; + /** + * Gets the list cache value for `key`. + * + * @private + * @name get + * @memberOf ListCache + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function listCacheGet(key) { + var data = this.__data__, + index = assocIndexOf(data, key); - zoom.scaleExtent = function(x) { - if (!arguments.length) return scaleExtent; - scaleExtent = x == null ? d3_behavior_zoomInfinity : x.map(Number); - return zoom; - }; + return index < 0 ? undefined : data[index][1]; + } - zoom.x = function(z) { - if (!arguments.length) return x1; - x1 = z; - x0 = z.copy(); - translate = [0, 0]; - scale = 1; - return zoom; - }; + /** + * Checks if a list cache value for `key` exists. + * + * @private + * @name has + * @memberOf ListCache + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function listCacheHas(key) { + return assocIndexOf(this.__data__, key) > -1; + } - zoom.y = function(z) { - if (!arguments.length) return y1; - y1 = z; - y0 = z.copy(); - translate = [0, 0]; - scale = 1; - return zoom; - }; + /** + * Sets the list cache `key` to `value`. + * + * @private + * @name set + * @memberOf ListCache + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the list cache instance. + */ + function listCacheSet(key, value) { + var data = this.__data__, + index = assocIndexOf(data, key); - function location(p) { - return [(p[0] - translate[0]) / scale, (p[1] - translate[1]) / scale]; - } + if (index < 0) { + ++this.size; + data.push([key, value]); + } else { + data[index][1] = value; + } + return this; + } - function point(l) { - return [l[0] * scale + translate[0], l[1] * scale + translate[1]]; - } + // Add methods to `ListCache`. + ListCache.prototype.clear = listCacheClear; + ListCache.prototype['delete'] = listCacheDelete; + ListCache.prototype.get = listCacheGet; + ListCache.prototype.has = listCacheHas; + ListCache.prototype.set = listCacheSet; - function scaleTo(s) { - scale = Math.max(scaleExtent[0], Math.min(scaleExtent[1], s)); - } - - function translateTo(p, l) { - l = point(l); - translate[0] += p[0] - l[0]; - translate[1] += p[1] - l[1]; - } - - function rescale() { - if (x1) x1.domain(x0.range().map(function(x) { return (x - translate[0]) / scale; }).map(x0.invert)); - if (y1) y1.domain(y0.range().map(function(y) { return (y - translate[1]) / scale; }).map(y0.invert)); - } + /*------------------------------------------------------------------------*/ - function dispatch(event) { - rescale(); - d3.event.preventDefault(); - event({type: "zoom", scale: scale, translate: translate}); - } + /** + * Creates a map cache object to store key-value pairs. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function MapCache(entries) { + var index = -1, + length = entries == null ? 0 : entries.length; - function mousedown() { - var target = this, - event_ = event.of(target, arguments), - eventTarget = d3.event.target, - moved = 0, - w = d3.select(d3_window).on("mousemove.zoom", mousemove).on("mouseup.zoom", mouseup), - l = location(d3.mouse(target)); + this.clear(); + while (++index < length) { + var entry = entries[index]; + this.set(entry[0], entry[1]); + } + } - d3_window.focus(); - d3_eventCancel(); + /** + * Removes all key-value entries from the map. + * + * @private + * @name clear + * @memberOf MapCache + */ + function mapCacheClear() { + this.size = 0; + this.__data__ = { + 'hash': new Hash, + 'map': new (Map || ListCache), + 'string': new Hash + }; + } - function mousemove() { - moved = 1; - translateTo(d3.mouse(target), l); - dispatch(event_); + /** + * Removes `key` and its value from the map. + * + * @private + * @name delete + * @memberOf MapCache + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function mapCacheDelete(key) { + var result = getMapData(this, key)['delete'](key); + this.size -= result ? 1 : 0; + return result; } - function mouseup() { - if (moved) d3_eventCancel(); - w.on("mousemove.zoom", null).on("mouseup.zoom", null); - if (moved && d3.event.target === eventTarget) { - w.on("click.zoom", click, true); - window.setTimeout(function() { - // Remove click block if click didn't fire - w.on("click.zoom", null); - }, 0); - } + /** + * Gets the map value for `key`. + * + * @private + * @name get + * @memberOf MapCache + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function mapCacheGet(key) { + return getMapData(this, key).get(key); } - function click() { - d3_eventCancel(); - w.on("click.zoom", null); + /** + * Checks if a map value for `key` exists. + * + * @private + * @name has + * @memberOf MapCache + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function mapCacheHas(key) { + return getMapData(this, key).has(key); } - } - function mousewheel() { - if (!translate0) translate0 = location(d3.mouse(this)); - scaleTo(Math.pow(2, d3_behavior_zoomDelta() * .002) * scale); - translateTo(d3.mouse(this), translate0); - dispatch(event.of(this, arguments)); - } + /** + * Sets the map `key` to `value`. + * + * @private + * @name set + * @memberOf MapCache + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the map cache instance. + */ + function mapCacheSet(key, value) { + var data = getMapData(this, key), + size = data.size; - function mousemove() { - translate0 = null; - } + data.set(key, value); + this.size += data.size == size ? 0 : 1; + return this; + } - function dblclick() { - var p = d3.mouse(this), l = location(p), k = Math.log(scale) / Math.LN2; - scaleTo(Math.pow(2, d3.event.shiftKey ? Math.ceil(k) - 1 : Math.floor(k) + 1)); - translateTo(p, l); - dispatch(event.of(this, arguments)); - } + // Add methods to `MapCache`. + MapCache.prototype.clear = mapCacheClear; + MapCache.prototype['delete'] = mapCacheDelete; + MapCache.prototype.get = mapCacheGet; + MapCache.prototype.has = mapCacheHas; + MapCache.prototype.set = mapCacheSet; - function touchstart() { - var touches = d3.touches(this), - now = Date.now(); + /*------------------------------------------------------------------------*/ - scale0 = scale; - translate0 = {}; - touches.forEach(function(t) { translate0[t.identifier] = location(t); }); - d3_eventCancel(); + /** + * + * Creates an array cache object to store unique values. + * + * @private + * @constructor + * @param {Array} [values] The values to cache. + */ + function SetCache(values) { + var index = -1, + length = values == null ? 0 : values.length; - if (touches.length === 1) { - if (now - touchtime < 500) { // dbltap - var p = touches[0], l = location(touches[0]); - scaleTo(scale * 2); - translateTo(p, l); - dispatch(event.of(this, arguments)); + this.__data__ = new MapCache; + while (++index < length) { + this.add(values[index]); } - touchtime = now; } - } - function touchmove() { - var touches = d3.touches(this), - p0 = touches[0], - l0 = translate0[p0.identifier]; - if (p1 = touches[1]) { - var p1, l1 = translate0[p1.identifier]; - p0 = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2]; - l0 = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2]; - scaleTo(d3.event.scale * scale0); + /** + * Adds `value` to the array cache. + * + * @private + * @name add + * @memberOf SetCache + * @alias push + * @param {*} value The value to cache. + * @returns {Object} Returns the cache instance. + */ + function setCacheAdd(value) { + this.__data__.set(value, HASH_UNDEFINED); + return this; } - translateTo(p0, l0); - touchtime = null; - dispatch(event.of(this, arguments)); - } - - return d3.rebind(zoom, event, "on"); -}; -var d3_behavior_zoomInfinity = [0, Infinity]; // default scale extent - -// https://developer.mozilla.org/en-US/docs/Mozilla_event_reference/wheel -var d3_behavior_zoomDelta, d3_behavior_zoomWheel - = "onwheel" in d3_document ? (d3_behavior_zoomDelta = function() { return -d3.event.deltaY * (d3.event.deltaMode ? 120 : 1); }, "wheel") - : "onmousewheel" in d3_document ? (d3_behavior_zoomDelta = function() { return d3.event.wheelDelta; }, "mousewheel") - : (d3_behavior_zoomDelta = function() { return -d3.event.detail; }, "MozMousePixelScroll"); -function d3_functor(v) { - return typeof v === "function" ? v : function() { return v; }; -} + /** + * Checks if `value` is in the array cache. + * + * @private + * @name has + * @memberOf SetCache + * @param {*} value The value to search for. + * @returns {number} Returns `true` if `value` is found, else `false`. + */ + function setCacheHas(value) { + return this.__data__.has(value); + } -d3.functor = d3_functor; + // Add methods to `SetCache`. + SetCache.prototype.add = SetCache.prototype.push = setCacheAdd; + SetCache.prototype.has = setCacheHas; -var d3_timer_id = 0, - d3_timer_byId = {}, - d3_timer_queue = null, - d3_timer_interval, // is an interval (or frame) active? - d3_timer_timeout; // is a timeout active? + /*------------------------------------------------------------------------*/ -// The timer will continue to fire until callback returns true. -d3.timer = function(callback, delay, then) { - if (arguments.length < 3) { - if (arguments.length < 2) delay = 0; - else if (!isFinite(delay)) return; - then = Date.now(); - } + /** + * Creates a stack cache object to store key-value pairs. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function Stack(entries) { + var data = this.__data__ = new ListCache(entries); + this.size = data.size; + } - // If the callback's already in the queue, update it. - var timer = d3_timer_byId[callback.id]; - if (timer && timer.callback === callback) { - timer.then = then; - timer.delay = delay; - } + /** + * Removes all key-value entries from the stack. + * + * @private + * @name clear + * @memberOf Stack + */ + function stackClear() { + this.__data__ = new ListCache; + this.size = 0; + } - // Otherwise, add the callback to the queue. - else d3_timer_byId[callback.id = ++d3_timer_id] = d3_timer_queue = { - callback: callback, - then: then, - delay: delay, - next: d3_timer_queue - }; + /** + * Removes `key` and its value from the stack. + * + * @private + * @name delete + * @memberOf Stack + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function stackDelete(key) { + var data = this.__data__, + result = data['delete'](key); - // Start animatin'! - if (!d3_timer_interval) { - d3_timer_timeout = clearTimeout(d3_timer_timeout); - d3_timer_interval = 1; - d3_timer_frame(d3_timer_step); - } -}; + this.size = data.size; + return result; + } -function d3_timer_step() { - var elapsed, - now = Date.now(), - t1 = d3_timer_queue; + /** + * Gets the stack value for `key`. + * + * @private + * @name get + * @memberOf Stack + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function stackGet(key) { + return this.__data__.get(key); + } - while (t1) { - elapsed = now - t1.then; - if (elapsed >= t1.delay) t1.flush = t1.callback(elapsed); - t1 = t1.next; - } + /** + * Checks if a stack value for `key` exists. + * + * @private + * @name has + * @memberOf Stack + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function stackHas(key) { + return this.__data__.has(key); + } - var delay = d3_timer_flush() - now; - if (delay > 24) { - if (isFinite(delay)) { - clearTimeout(d3_timer_timeout); - d3_timer_timeout = setTimeout(d3_timer_step, delay); + /** + * Sets the stack `key` to `value`. + * + * @private + * @name set + * @memberOf Stack + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the stack cache instance. + */ + function stackSet(key, value) { + var data = this.__data__; + if (data instanceof ListCache) { + var pairs = data.__data__; + if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) { + pairs.push([key, value]); + this.size = ++data.size; + return this; + } + data = this.__data__ = new MapCache(pairs); + } + data.set(key, value); + this.size = data.size; + return this; } - d3_timer_interval = 0; - } else { - d3_timer_interval = 1; - d3_timer_frame(d3_timer_step); - } -} -d3.timer.flush = function() { - var elapsed, - now = Date.now(), - t1 = d3_timer_queue; + // Add methods to `Stack`. + Stack.prototype.clear = stackClear; + Stack.prototype['delete'] = stackDelete; + Stack.prototype.get = stackGet; + Stack.prototype.has = stackHas; + Stack.prototype.set = stackSet; - while (t1) { - elapsed = now - t1.then; - if (!t1.delay) t1.flush = t1.callback(elapsed); - t1 = t1.next; - } + /*------------------------------------------------------------------------*/ - d3_timer_flush(); -}; + /** + * Creates an array of the enumerable property names of the array-like `value`. + * + * @private + * @param {*} value The value to query. + * @param {boolean} inherited Specify returning inherited property names. + * @returns {Array} Returns the array of property names. + */ + function arrayLikeKeys(value, inherited) { + var isArr = isArray(value), + isArg = !isArr && isArguments(value), + isBuff = !isArr && !isArg && isBuffer(value), + isType = !isArr && !isArg && !isBuff && isTypedArray(value), + skipIndexes = isArr || isArg || isBuff || isType, + result = skipIndexes ? baseTimes(value.length, String) : [], + length = result.length; + + for (var key in value) { + if ((inherited || hasOwnProperty.call(value, key)) && + !(skipIndexes && ( + // Safari 9 has enumerable `arguments.length` in strict mode. + key == 'length' || + // Node.js 0.10 has enumerable non-index properties on buffers. + (isBuff && (key == 'offset' || key == 'parent')) || + // PhantomJS 2 has enumerable non-index properties on typed arrays. + (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) || + // Skip index properties. + isIndex(key, length) + ))) { + result.push(key); + } + } + return result; + } -// Flush after callbacks to avoid concurrent queue modification. -function d3_timer_flush() { - var t0 = null, - t1 = d3_timer_queue, - then = Infinity; - while (t1) { - if (t1.flush) { - delete d3_timer_byId[t1.callback.id]; - t1 = t0 ? t0.next = t1.next : d3_timer_queue = t1.next; - } else { - then = Math.min(then, t1.then + t1.delay); - t1 = (t0 = t1).next; + /** + * A specialized version of `_.sample` for arrays. + * + * @private + * @param {Array} array The array to sample. + * @returns {*} Returns the random element. + */ + function arraySample(array) { + var length = array.length; + return length ? array[baseRandom(0, length - 1)] : undefined; } - } - return then; -} -var d3_timer_frame = d3_window.requestAnimationFrame - || d3_window.webkitRequestAnimationFrame - || d3_window.mozRequestAnimationFrame - || d3_window.oRequestAnimationFrame - || d3_window.msRequestAnimationFrame - || function(callback) { setTimeout(callback, 17); }; -var π = Math.PI, - ε = 1e-6, - d3_radians = π / 180, - d3_degrees = 180 / π; + /** + * A specialized version of `_.sampleSize` for arrays. + * + * @private + * @param {Array} array The array to sample. + * @param {number} n The number of elements to sample. + * @returns {Array} Returns the random elements. + */ + function arraySampleSize(array, n) { + return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length)); + } -function d3_sgn(x) { - return x > 0 ? 1 : x < 0 ? -1 : 0; -} + /** + * A specialized version of `_.shuffle` for arrays. + * + * @private + * @param {Array} array The array to shuffle. + * @returns {Array} Returns the new shuffled array. + */ + function arrayShuffle(array) { + return shuffleSelf(copyArray(array)); + } -function d3_acos(x) { - return Math.acos(Math.max(-1, Math.min(1, x))); -} + /** + * This function is like `assignValue` except that it doesn't assign + * `undefined` values. + * + * @private + * @param {Object} object The object to modify. + * @param {string} key The key of the property to assign. + * @param {*} value The value to assign. + */ + function assignMergeValue(object, key, value) { + if ((value !== undefined && !eq(object[key], value)) || + (value === undefined && !(key in object))) { + baseAssignValue(object, key, value); + } + } -function d3_asin(x) { - return x > 1 ? π / 2 : x < -1 ? -π / 2 : Math.asin(x); -} + /** + * Assigns `value` to `key` of `object` if the existing value is not equivalent + * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. + * + * @private + * @param {Object} object The object to modify. + * @param {string} key The key of the property to assign. + * @param {*} value The value to assign. + */ + function assignValue(object, key, value) { + var objValue = object[key]; + if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) || + (value === undefined && !(key in object))) { + baseAssignValue(object, key, value); + } + } -function d3_sinh(x) { - return (Math.exp(x) - Math.exp(-x)) / 2; -} + /** + * Gets the index at which the `key` is found in `array` of key-value pairs. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} key The key to search for. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function assocIndexOf(array, key) { + var length = array.length; + while (length--) { + if (eq(array[length][0], key)) { + return length; + } + } + return -1; + } -function d3_cosh(x) { - return (Math.exp(x) + Math.exp(-x)) / 2; -} + /** + * Aggregates elements of `collection` on `accumulator` with keys transformed + * by `iteratee` and values set by `setter`. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} setter The function to set `accumulator` values. + * @param {Function} iteratee The iteratee to transform keys. + * @param {Object} accumulator The initial aggregated object. + * @returns {Function} Returns `accumulator`. + */ + function baseAggregator(collection, setter, iteratee, accumulator) { + baseEach(collection, function(value, key, collection) { + setter(accumulator, value, iteratee(value), collection); + }); + return accumulator; + } -function d3_haversin(x) { - return (x = Math.sin(x / 2)) * x; -} -d3.geo = {}; -function d3_identity(d) { - return d; -} -function d3_true() { - return true; -} + /** + * The base implementation of `_.assign` without support for multiple sources + * or `customizer` functions. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @returns {Object} Returns `object`. + */ + function baseAssign(object, source) { + return object && copyObject(source, keys(source), object); + } -function d3_geo_spherical(cartesian) { - return [ - Math.atan2(cartesian[1], cartesian[0]), - Math.asin(Math.max(-1, Math.min(1, cartesian[2]))) - ]; -} + /** + * The base implementation of `_.assignIn` without support for multiple sources + * or `customizer` functions. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @returns {Object} Returns `object`. + */ + function baseAssignIn(object, source) { + return object && copyObject(source, keysIn(source), object); + } -function d3_geo_sphericalEqual(a, b) { - return Math.abs(a[0] - b[0]) < ε && Math.abs(a[1] - b[1]) < ε; -} + /** + * The base implementation of `assignValue` and `assignMergeValue` without + * value checks. + * + * @private + * @param {Object} object The object to modify. + * @param {string} key The key of the property to assign. + * @param {*} value The value to assign. + */ + function baseAssignValue(object, key, value) { + if (key == '__proto__' && defineProperty) { + defineProperty(object, key, { + 'configurable': true, + 'enumerable': true, + 'value': value, + 'writable': true + }); + } else { + object[key] = value; + } + } -// General spherical polygon clipping algorithm: takes a polygon, cuts it into -// visible line segments and rejoins the segments by interpolating along the -// clip edge. -function d3_geo_clipPolygon(segments, compare, inside, interpolate, listener) { - var subject = [], - clip = []; + /** + * The base implementation of `_.at` without support for individual paths. + * + * @private + * @param {Object} object The object to iterate over. + * @param {string[]} paths The property paths to pick. + * @returns {Array} Returns the picked elements. + */ + function baseAt(object, paths) { + var index = -1, + length = paths.length, + result = Array(length), + skip = object == null; - segments.forEach(function(segment) { - if ((n = segment.length - 1) <= 0) return; - var n, p0 = segment[0], p1 = segment[n]; - - // If the first and last points of a segment are coincident, then treat as - // a closed ring. - // TODO if all rings are closed, then the winding order of the exterior - // ring should be checked. - if (d3_geo_sphericalEqual(p0, p1)) { - listener.lineStart(); - for (var i = 0; i < n; ++i) listener.point((p0 = segment[i])[0], p0[1]); - listener.lineEnd(); - return; + while (++index < length) { + result[index] = skip ? undefined : get(object, paths[index]); + } + return result; } - var a = {point: p0, points: segment, other: null, visited: false, entry: true, subject: true}, - b = {point: p0, points: [p0], other: a, visited: false, entry: false, subject: false}; - a.other = b; - subject.push(a); - clip.push(b); - a = {point: p1, points: [p1], other: null, visited: false, entry: false, subject: true}; - b = {point: p1, points: [p1], other: a, visited: false, entry: true, subject: false}; - a.other = b; - subject.push(a); - clip.push(b); - }); - clip.sort(compare); - d3_geo_clipPolygonLinkCircular(subject); - d3_geo_clipPolygonLinkCircular(clip); - if (!subject.length) return; - - if (inside) for (var i = 1, e = !inside(clip[0].point), n = clip.length; i < n; ++i) { - clip[i].entry = (e = !e); - } + /** + * The base implementation of `_.clamp` which doesn't coerce arguments. + * + * @private + * @param {number} number The number to clamp. + * @param {number} [lower] The lower bound. + * @param {number} upper The upper bound. + * @returns {number} Returns the clamped number. + */ + function baseClamp(number, lower, upper) { + if (number === number) { + if (upper !== undefined) { + number = number <= upper ? number : upper; + } + if (lower !== undefined) { + number = number >= lower ? number : lower; + } + } + return number; + } - var start = subject[0], - current, - points, - point; - while (1) { - // Find first unvisited intersection. - current = start; - while (current.visited) if ((current = current.next) === start) return; - points = current.points; - listener.lineStart(); - do { - current.visited = current.other.visited = true; - if (current.entry) { - if (current.subject) { - for (var i = 0; i < points.length; i++) listener.point((point = points[i])[0], point[1]); - } else { - interpolate(current.point, current.next.point, 1, listener); + /** + * The base implementation of `_.clone` and `_.cloneDeep` which tracks + * traversed objects. + * + * @private + * @param {*} value The value to clone. + * @param {boolean} bitmask The bitmask flags. + * 1 - Deep clone + * 2 - Flatten inherited properties + * 4 - Clone symbols + * @param {Function} [customizer] The function to customize cloning. + * @param {string} [key] The key of `value`. + * @param {Object} [object] The parent object of `value`. + * @param {Object} [stack] Tracks traversed objects and their clone counterparts. + * @returns {*} Returns the cloned value. + */ + function baseClone(value, bitmask, customizer, key, object, stack) { + var result, + isDeep = bitmask & CLONE_DEEP_FLAG, + isFlat = bitmask & CLONE_FLAT_FLAG, + isFull = bitmask & CLONE_SYMBOLS_FLAG; + + if (customizer) { + result = object ? customizer(value, key, object, stack) : customizer(value); + } + if (result !== undefined) { + return result; + } + if (!isObject(value)) { + return value; + } + var isArr = isArray(value); + if (isArr) { + result = initCloneArray(value); + if (!isDeep) { + return copyArray(value, result); } - current = current.next; } else { - if (current.subject) { - points = current.prev.points; - for (var i = points.length; --i >= 0;) listener.point((point = points[i])[0], point[1]); + var tag = getTag(value), + isFunc = tag == funcTag || tag == genTag; + + if (isBuffer(value)) { + return cloneBuffer(value, isDeep); + } + if (tag == objectTag || tag == argsTag || (isFunc && !object)) { + result = (isFlat || isFunc) ? {} : initCloneObject(value); + if (!isDeep) { + return isFlat + ? copySymbolsIn(value, baseAssignIn(result, value)) + : copySymbols(value, baseAssign(result, value)); + } } else { - interpolate(current.point, current.prev.point, -1, listener); + if (!cloneableTags[tag]) { + return object ? value : {}; + } + result = initCloneByTag(value, tag, baseClone, isDeep); } - current = current.prev; } - current = current.other; - points = current.points; - } while (!current.visited); - listener.lineEnd(); - } -} + // Check for circular references and return its corresponding clone. + stack || (stack = new Stack); + var stacked = stack.get(value); + if (stacked) { + return stacked; + } + stack.set(value, result); -function d3_geo_clipPolygonLinkCircular(array) { - if (!(n = array.length)) return; - var n, - i = 0, - a = array[0], - b; - while (++i < n) { - a.next = b = array[i]; - b.prev = a; - a = b; - } - a.next = b = array[0]; - b.prev = a; -} + var keysFunc = isFull + ? (isFlat ? getAllKeysIn : getAllKeys) + : (isFlat ? keysIn : keys); -function d3_geo_clip(pointVisible, clipLine, interpolate) { - return function(listener) { - var line = clipLine(listener); + var props = isArr ? undefined : keysFunc(value); + arrayEach(props || value, function(subValue, key) { + if (props) { + key = subValue; + subValue = value[key]; + } + // Recursively populate clone (susceptible to call stack limits). + assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack)); + }); + return result; + } - var clip = { - point: point, - lineStart: lineStart, - lineEnd: lineEnd, - polygonStart: function() { - clip.point = pointRing; - clip.lineStart = ringStart; - clip.lineEnd = ringEnd; - invisible = false; - invisibleArea = visibleArea = 0; - segments = []; - listener.polygonStart(); - }, - polygonEnd: function() { - clip.point = point; - clip.lineStart = lineStart; - clip.lineEnd = lineEnd; + /** + * The base implementation of `_.conforms` which doesn't clone `source`. + * + * @private + * @param {Object} source The object of property predicates to conform to. + * @returns {Function} Returns the new spec function. + */ + function baseConforms(source) { + var props = keys(source); + return function(object) { + return baseConformsTo(object, source, props); + }; + } - segments = d3.merge(segments); - if (segments.length) { - d3_geo_clipPolygon(segments, d3_geo_clipSort, null, interpolate, listener); - } else if (visibleArea < -ε || invisible && invisibleArea < -ε) { - listener.lineStart(); - interpolate(null, null, 1, listener); - listener.lineEnd(); - } - listener.polygonEnd(); - segments = null; - }, - sphere: function() { - listener.polygonStart(); - listener.lineStart(); - interpolate(null, null, 1, listener); - listener.lineEnd(); - listener.polygonEnd(); + /** + * The base implementation of `_.conformsTo` which accepts `props` to check. + * + * @private + * @param {Object} object The object to inspect. + * @param {Object} source The object of property predicates to conform to. + * @returns {boolean} Returns `true` if `object` conforms, else `false`. + */ + function baseConformsTo(object, source, props) { + var length = props.length; + if (object == null) { + return !length; } - }; + object = Object(object); + while (length--) { + var key = props[length], + predicate = source[key], + value = object[key]; - function point(λ, φ) { if (pointVisible(λ, φ)) listener.point(λ, φ); } - function pointLine(λ, φ) { line.point(λ, φ); } - function lineStart() { clip.point = pointLine; line.lineStart(); } - function lineEnd() { clip.point = point; line.lineEnd(); } + if ((value === undefined && !(key in object)) || !predicate(value)) { + return false; + } + } + return true; + } - var segments, - visibleArea, - invisibleArea, - invisible; + /** + * The base implementation of `_.delay` and `_.defer` which accepts `args` + * to provide to `func`. + * + * @private + * @param {Function} func The function to delay. + * @param {number} wait The number of milliseconds to delay invocation. + * @param {Array} args The arguments to provide to `func`. + * @returns {number|Object} Returns the timer id or timeout object. + */ + function baseDelay(func, wait, args) { + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + return setTimeout(function() { func.apply(undefined, args); }, wait); + } - var buffer = d3_geo_clipBufferListener(), - ringListener = clipLine(buffer), - ring; + /** + * The base implementation of methods like `_.difference` without support + * for excluding multiple arrays or iteratee shorthands. + * + * @private + * @param {Array} array The array to inspect. + * @param {Array} values The values to exclude. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of filtered values. + */ + function baseDifference(array, values, iteratee, comparator) { + var index = -1, + includes = arrayIncludes, + isCommon = true, + length = array.length, + result = [], + valuesLength = values.length; - function pointRing(λ, φ) { - ringListener.point(λ, φ); - ring.push([λ, φ]); + if (!length) { + return result; + } + if (iteratee) { + values = arrayMap(values, baseUnary(iteratee)); + } + if (comparator) { + includes = arrayIncludesWith; + isCommon = false; + } + else if (values.length >= LARGE_ARRAY_SIZE) { + includes = cacheHas; + isCommon = false; + values = new SetCache(values); + } + outer: + while (++index < length) { + var value = array[index], + computed = iteratee == null ? value : iteratee(value); + + value = (comparator || value !== 0) ? value : 0; + if (isCommon && computed === computed) { + var valuesIndex = valuesLength; + while (valuesIndex--) { + if (values[valuesIndex] === computed) { + continue outer; + } + } + result.push(value); + } + else if (!includes(values, computed, comparator)) { + result.push(value); + } + } + return result; } - function ringStart() { - ringListener.lineStart(); - ring = []; - } + /** + * The base implementation of `_.forEach` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array|Object} Returns `collection`. + */ + var baseEach = createBaseEach(baseForOwn); - function ringEnd() { - pointRing(ring[0][0], ring[0][1]); - ringListener.lineEnd(); + /** + * The base implementation of `_.forEachRight` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array|Object} Returns `collection`. + */ + var baseEachRight = createBaseEach(baseForOwnRight, true); - var clean = ringListener.clean(), - ringSegments = buffer.buffer(), - segment, - n = ringSegments.length; + /** + * The base implementation of `_.every` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {boolean} Returns `true` if all elements pass the predicate check, + * else `false` + */ + function baseEvery(collection, predicate) { + var result = true; + baseEach(collection, function(value, index, collection) { + result = !!predicate(value, index, collection); + return result; + }); + return result; + } - // TODO compute on-the-fly? - if (!n) { - invisible = true; - invisibleArea += d3_geo_clipAreaRing(ring, -1); - ring = null; - return; - } - ring = null; + /** + * The base implementation of methods like `_.max` and `_.min` which accepts a + * `comparator` to determine the extremum value. + * + * @private + * @param {Array} array The array to iterate over. + * @param {Function} iteratee The iteratee invoked per iteration. + * @param {Function} comparator The comparator used to compare values. + * @returns {*} Returns the extremum value. + */ + function baseExtremum(array, iteratee, comparator) { + var index = -1, + length = array.length; - // No intersections. - // TODO compute on-the-fly? - if (clean & 1) { - segment = ringSegments[0]; - visibleArea += d3_geo_clipAreaRing(segment, 1); - var n = segment.length - 1, - i = -1, - point; - listener.lineStart(); - while (++i < n) listener.point((point = segment[i])[0], point[1]); - listener.lineEnd(); - return; + while (++index < length) { + var value = array[index], + current = iteratee(value); + + if (current != null && (computed === undefined + ? (current === current && !isSymbol(current)) + : comparator(current, computed) + )) { + var computed = current, + result = value; + } } + return result; + } - // Rejoin connected segments. - // TODO reuse bufferListener.rejoin()? - if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift())); + /** + * The base implementation of `_.fill` without an iteratee call guard. + * + * @private + * @param {Array} array The array to fill. + * @param {*} value The value to fill `array` with. + * @param {number} [start=0] The start position. + * @param {number} [end=array.length] The end position. + * @returns {Array} Returns `array`. + */ + function baseFill(array, value, start, end) { + var length = array.length; - segments.push(ringSegments.filter(d3_geo_clipSegmentLength1)); + start = toInteger(start); + if (start < 0) { + start = -start > length ? 0 : (length + start); + } + end = (end === undefined || end > length) ? length : toInteger(end); + if (end < 0) { + end += length; + } + end = start > end ? 0 : toLength(end); + while (start < end) { + array[start++] = value; + } + return array; } - return clip; - }; -} + /** + * The base implementation of `_.filter` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + */ + function baseFilter(collection, predicate) { + var result = []; + baseEach(collection, function(value, index, collection) { + if (predicate(value, index, collection)) { + result.push(value); + } + }); + return result; + } -function d3_geo_clipSegmentLength1(segment) { - return segment.length > 1; -} + /** + * The base implementation of `_.flatten` with support for restricting flattening. + * + * @private + * @param {Array} array The array to flatten. + * @param {number} depth The maximum recursion depth. + * @param {boolean} [predicate=isFlattenable] The function invoked per iteration. + * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks. + * @param {Array} [result=[]] The initial result value. + * @returns {Array} Returns the new flattened array. + */ + function baseFlatten(array, depth, predicate, isStrict, result) { + var index = -1, + length = array.length; -function d3_geo_clipBufferListener() { - var lines = [], - line; - return { - lineStart: function() { lines.push(line = []); }, - point: function(λ, φ) { line.push([λ, φ]); }, - lineEnd: d3_noop, - buffer: function() { - var buffer = lines; - lines = []; - line = null; - return buffer; - }, - rejoin: function() { - if (lines.length > 1) lines.push(lines.pop().concat(lines.shift())); - } - }; -} + predicate || (predicate = isFlattenable); + result || (result = []); -// Approximate polygon ring area (×2, since we only need the sign). -// For an invisible polygon ring, we rotate longitudinally by 180°. -// The invisible parameter should be 1, or -1 to rotate longitudinally. -// Based on Robert. G. Chamberlain and William H. Duquette, -// “Some Algorithms for Polygons on a Sphere”, -// http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409 -function d3_geo_clipAreaRing(ring, invisible) { - if (!(n = ring.length)) return 0; - var n, - i = 0, - area = 0, - p = ring[0], - λ = p[0], - φ = p[1], - cosφ = Math.cos(φ), - x0 = Math.atan2(invisible * Math.sin(λ) * cosφ, Math.sin(φ)), - y0 = 1 - invisible * Math.cos(λ) * cosφ, - x1 = x0, - x, // λ'; λ rotated to south pole. - y; // φ' = 1 + sin(φ); φ rotated to south pole. - while (++i < n) { - p = ring[i]; - cosφ = Math.cos(φ = p[1]); - x = Math.atan2(invisible * Math.sin(λ = p[0]) * cosφ, Math.sin(φ)); - y = 1 - invisible * Math.cos(λ) * cosφ; + while (++index < length) { + var value = array[index]; + if (depth > 0 && predicate(value)) { + if (depth > 1) { + // Recursively flatten arrays (susceptible to call stack limits). + baseFlatten(value, depth - 1, predicate, isStrict, result); + } else { + arrayPush(result, value); + } + } else if (!isStrict) { + result[result.length] = value; + } + } + return result; + } - // If both the current point and the previous point are at the north pole, - // skip this point. - if (Math.abs(y0 - 2) < ε && Math.abs(y - 2) < ε) continue; + /** + * The base implementation of `baseForOwn` which iterates over `object` + * properties returned by `keysFunc` and invokes `iteratee` for each property. + * Iteratee functions may exit iteration early by explicitly returning `false`. + * + * @private + * @param {Object} object The object to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {Function} keysFunc The function to get the keys of `object`. + * @returns {Object} Returns `object`. + */ + var baseFor = createBaseFor(); - // If this or the previous point is at the south pole, or if this segment - // goes through the south pole, the area is 0. - if (Math.abs(y) < ε || Math.abs(y0) < ε) {} + /** + * This function is like `baseFor` except that it iterates over properties + * in the opposite order. + * + * @private + * @param {Object} object The object to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {Function} keysFunc The function to get the keys of `object`. + * @returns {Object} Returns `object`. + */ + var baseForRight = createBaseFor(true); - // If this segment goes through either pole… - else if (Math.abs(Math.abs(x - x0) - π) < ε) { - // For the north pole, compute lune area. - if (y + y0 > 2) area += 4 * (x - x0); - // For the south pole, the area is zero. + /** + * The base implementation of `_.forOwn` without support for iteratee shorthands. + * + * @private + * @param {Object} object The object to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Object} Returns `object`. + */ + function baseForOwn(object, iteratee) { + return object && baseFor(object, iteratee, keys); } - // If the previous point is at the north pole, then compute lune area. - else if (Math.abs(y0 - 2) < ε) area += 4 * (x - x1); + /** + * The base implementation of `_.forOwnRight` without support for iteratee shorthands. + * + * @private + * @param {Object} object The object to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Object} Returns `object`. + */ + function baseForOwnRight(object, iteratee) { + return object && baseForRight(object, iteratee, keys); + } - // Otherwise, the spherical triangle area is approximately - // δλ * (1 + sinφ0 + 1 + sinφ) / 2. - else area += ((3 * π + x - x0) % (2 * π) - π) * (y0 + y); + /** + * The base implementation of `_.functions` which creates an array of + * `object` function property names filtered from `props`. + * + * @private + * @param {Object} object The object to inspect. + * @param {Array} props The property names to filter. + * @returns {Array} Returns the function names. + */ + function baseFunctions(object, props) { + return arrayFilter(props, function(key) { + return isFunction(object[key]); + }); + } - x1 = x0, x0 = x, y0 = y; - } - return area; -} + /** + * The base implementation of `_.get` without support for default values. + * + * @private + * @param {Object} object The object to query. + * @param {Array|string} path The path of the property to get. + * @returns {*} Returns the resolved value. + */ + function baseGet(object, path) { + path = castPath(path, object); -// Intersection points are sorted along the clip edge. For both antimeridian -// cutting and circle clipping, the same comparison is used. -function d3_geo_clipSort(a, b) { - return ((a = a.point)[0] < 0 ? a[1] - π / 2 - ε : π / 2 - a[1]) - - ((b = b.point)[0] < 0 ? b[1] - π / 2 - ε : π / 2 - b[1]); -} + var index = 0, + length = path.length; -var d3_geo_clipAntimeridian = d3_geo_clip(d3_true, d3_geo_clipAntimeridianLine, d3_geo_clipAntimeridianInterpolate); + while (object != null && index < length) { + object = object[toKey(path[index++])]; + } + return (index && index == length) ? object : undefined; + } -// Takes a line and cuts into visible segments. Return values: -// 0: there were intersections or the line was empty. -// 1: no intersections. -// 2: there were intersections, and the first and last segments should be -// rejoined. -function d3_geo_clipAntimeridianLine(listener) { - var λ0 = NaN, - φ0 = NaN, - sλ0 = NaN, - clean; // no intersections + /** + * The base implementation of `getAllKeys` and `getAllKeysIn` which uses + * `keysFunc` and `symbolsFunc` to get the enumerable property names and + * symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @param {Function} keysFunc The function to get the keys of `object`. + * @param {Function} symbolsFunc The function to get the symbols of `object`. + * @returns {Array} Returns the array of property names and symbols. + */ + function baseGetAllKeys(object, keysFunc, symbolsFunc) { + var result = keysFunc(object); + return isArray(object) ? result : arrayPush(result, symbolsFunc(object)); + } - return { - lineStart: function() { - listener.lineStart(); - clean = 1; - }, - point: function(λ1, φ1) { - var sλ1 = λ1 > 0 ? π : -π, - dλ = Math.abs(λ1 - λ0); - if (Math.abs(dλ - π) < ε) { // line crosses a pole - listener.point(λ0, φ0 = (φ0 + φ1) / 2 > 0 ? π / 2 : -π / 2); - listener.point(sλ0, φ0); - listener.lineEnd(); - listener.lineStart(); - listener.point(sλ1, φ0); - listener.point( λ1, φ0); - clean = 0; - } else if (sλ0 !== sλ1 && dλ >= π) { // line crosses antimeridian - // handle degeneracies - if (Math.abs(λ0 - sλ0) < ε) λ0 -= sλ0 * ε; - if (Math.abs(λ1 - sλ1) < ε) λ1 -= sλ1 * ε; - φ0 = d3_geo_clipAntimeridianIntersect(λ0, φ0, λ1, φ1); - listener.point(sλ0, φ0); - listener.lineEnd(); - listener.lineStart(); - listener.point(sλ1, φ0); - clean = 0; + /** + * The base implementation of `getTag` without fallbacks for buggy environments. + * + * @private + * @param {*} value The value to query. + * @returns {string} Returns the `toStringTag`. + */ + function baseGetTag(value) { + if (value == null) { + return value === undefined ? undefinedTag : nullTag; } - listener.point(λ0 = λ1, φ0 = φ1); - sλ0 = sλ1; - }, - lineEnd: function() { - listener.lineEnd(); - λ0 = φ0 = NaN; - }, - // if there are intersections, we always rejoin the first and last segments. - clean: function() { return 2 - clean; } - }; -} + return (symToStringTag && symToStringTag in Object(value)) + ? getRawTag(value) + : objectToString(value); + } -function d3_geo_clipAntimeridianIntersect(λ0, φ0, λ1, φ1) { - var cosφ0, - cosφ1, - sinλ0_λ1 = Math.sin(λ0 - λ1); - return Math.abs(sinλ0_λ1) > ε - ? Math.atan((Math.sin(φ0) * (cosφ1 = Math.cos(φ1)) * Math.sin(λ1) - - Math.sin(φ1) * (cosφ0 = Math.cos(φ0)) * Math.sin(λ0)) - / (cosφ0 * cosφ1 * sinλ0_λ1)) - : (φ0 + φ1) / 2; -} + /** + * The base implementation of `_.gt` which doesn't coerce arguments. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is greater than `other`, + * else `false`. + */ + function baseGt(value, other) { + return value > other; + } -function d3_geo_clipAntimeridianInterpolate(from, to, direction, listener) { - var φ; - if (from == null) { - φ = direction * π / 2; - listener.point(-π, φ); - listener.point( 0, φ); - listener.point( π, φ); - listener.point( π, 0); - listener.point( π, -φ); - listener.point( 0, -φ); - listener.point(-π, -φ); - listener.point(-π, 0); - listener.point(-π, φ); - } else if (Math.abs(from[0] - to[0]) > ε) { - var s = (from[0] < to[0] ? 1 : -1) * π; - φ = direction * s / 2; - listener.point(-s, φ); - listener.point( 0, φ); - listener.point( s, φ); - } else { - listener.point(to[0], to[1]); - } -} -// TODO -// cross and scale return new vectors, -// whereas add and normalize operate in-place + /** + * The base implementation of `_.has` without support for deep paths. + * + * @private + * @param {Object} [object] The object to query. + * @param {Array|string} key The key to check. + * @returns {boolean} Returns `true` if `key` exists, else `false`. + */ + function baseHas(object, key) { + return object != null && hasOwnProperty.call(object, key); + } -function d3_geo_cartesian(spherical) { - var λ = spherical[0], - φ = spherical[1], - cosφ = Math.cos(φ); - return [ - cosφ * Math.cos(λ), - cosφ * Math.sin(λ), - Math.sin(φ) - ]; -} + /** + * The base implementation of `_.hasIn` without support for deep paths. + * + * @private + * @param {Object} [object] The object to query. + * @param {Array|string} key The key to check. + * @returns {boolean} Returns `true` if `key` exists, else `false`. + */ + function baseHasIn(object, key) { + return object != null && key in Object(object); + } -function d3_geo_cartesianDot(a, b) { - return a[0] * b[0] + a[1] * b[1] + a[2] * b[2]; -} + /** + * The base implementation of `_.inRange` which doesn't coerce arguments. + * + * @private + * @param {number} number The number to check. + * @param {number} start The start of the range. + * @param {number} end The end of the range. + * @returns {boolean} Returns `true` if `number` is in the range, else `false`. + */ + function baseInRange(number, start, end) { + return number >= nativeMin(start, end) && number < nativeMax(start, end); + } -function d3_geo_cartesianCross(a, b) { - return [ - a[1] * b[2] - a[2] * b[1], - a[2] * b[0] - a[0] * b[2], - a[0] * b[1] - a[1] * b[0] - ]; -} + /** + * The base implementation of methods like `_.intersection`, without support + * for iteratee shorthands, that accepts an array of arrays to inspect. + * + * @private + * @param {Array} arrays The arrays to inspect. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of shared values. + */ + function baseIntersection(arrays, iteratee, comparator) { + var includes = comparator ? arrayIncludesWith : arrayIncludes, + length = arrays[0].length, + othLength = arrays.length, + othIndex = othLength, + caches = Array(othLength), + maxLength = Infinity, + result = []; + + while (othIndex--) { + var array = arrays[othIndex]; + if (othIndex && iteratee) { + array = arrayMap(array, baseUnary(iteratee)); + } + maxLength = nativeMin(array.length, maxLength); + caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120)) + ? new SetCache(othIndex && array) + : undefined; + } + array = arrays[0]; -function d3_geo_cartesianAdd(a, b) { - a[0] += b[0]; - a[1] += b[1]; - a[2] += b[2]; -} + var index = -1, + seen = caches[0]; + + outer: + while (++index < length && result.length < maxLength) { + var value = array[index], + computed = iteratee ? iteratee(value) : value; + + value = (comparator || value !== 0) ? value : 0; + if (!(seen + ? cacheHas(seen, computed) + : includes(result, computed, comparator) + )) { + othIndex = othLength; + while (--othIndex) { + var cache = caches[othIndex]; + if (!(cache + ? cacheHas(cache, computed) + : includes(arrays[othIndex], computed, comparator)) + ) { + continue outer; + } + } + if (seen) { + seen.push(computed); + } + result.push(value); + } + } + return result; + } -function d3_geo_cartesianScale(vector, k) { - return [ - vector[0] * k, - vector[1] * k, - vector[2] * k - ]; -} + /** + * The base implementation of `_.invert` and `_.invertBy` which inverts + * `object` with values transformed by `iteratee` and set by `setter`. + * + * @private + * @param {Object} object The object to iterate over. + * @param {Function} setter The function to set `accumulator` values. + * @param {Function} iteratee The iteratee to transform values. + * @param {Object} accumulator The initial inverted object. + * @returns {Function} Returns `accumulator`. + */ + function baseInverter(object, setter, iteratee, accumulator) { + baseForOwn(object, function(value, key, object) { + setter(accumulator, iteratee(value), key, object); + }); + return accumulator; + } -function d3_geo_cartesianNormalize(d) { - var l = Math.sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]); - d[0] /= l; - d[1] /= l; - d[2] /= l; -} + /** + * The base implementation of `_.invoke` without support for individual + * method arguments. + * + * @private + * @param {Object} object The object to query. + * @param {Array|string} path The path of the method to invoke. + * @param {Array} args The arguments to invoke the method with. + * @returns {*} Returns the result of the invoked method. + */ + function baseInvoke(object, path, args) { + path = castPath(path, object); + object = parent(object, path); + var func = object == null ? object : object[toKey(last(path))]; + return func == null ? undefined : apply(func, object, args); + } -function d3_geo_equirectangular(λ, φ) { - return [λ, φ]; -} + /** + * The base implementation of `_.isArguments`. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an `arguments` object, + */ + function baseIsArguments(value) { + return isObjectLike(value) && baseGetTag(value) == argsTag; + } -(d3.geo.equirectangular = function() { - return d3_geo_projection(d3_geo_equirectangular); -}).raw = d3_geo_equirectangular.invert = d3_geo_equirectangular; + /** + * The base implementation of `_.isArrayBuffer` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`. + */ + function baseIsArrayBuffer(value) { + return isObjectLike(value) && baseGetTag(value) == arrayBufferTag; + } -d3.geo.rotation = function(rotate) { - rotate = d3_geo_rotation(rotate[0] % 360 * d3_radians, rotate[1] * d3_radians, rotate.length > 2 ? rotate[2] * d3_radians : 0); + /** + * The base implementation of `_.isDate` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a date object, else `false`. + */ + function baseIsDate(value) { + return isObjectLike(value) && baseGetTag(value) == dateTag; + } - function forward(coordinates) { - coordinates = rotate(coordinates[0] * d3_radians, coordinates[1] * d3_radians); - return coordinates[0] *= d3_degrees, coordinates[1] *= d3_degrees, coordinates; - } + /** + * The base implementation of `_.isEqual` which supports partial comparisons + * and tracks traversed objects. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @param {boolean} bitmask The bitmask flags. + * 1 - Unordered comparison + * 2 - Partial comparison + * @param {Function} [customizer] The function to customize comparisons. + * @param {Object} [stack] Tracks traversed `value` and `other` objects. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + */ + function baseIsEqual(value, other, bitmask, customizer, stack) { + if (value === other) { + return true; + } + if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) { + return value !== value && other !== other; + } + return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack); + } - forward.invert = function(coordinates) { - coordinates = rotate.invert(coordinates[0] * d3_radians, coordinates[1] * d3_radians); - return coordinates[0] *= d3_degrees, coordinates[1] *= d3_degrees, coordinates; - }; + /** + * A specialized version of `baseIsEqual` for arrays and objects which performs + * deep comparisons and tracks traversed objects enabling objects with circular + * references to be compared. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} [stack] Tracks traversed `object` and `other` objects. + * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. + */ + function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) { + var objIsArr = isArray(object), + othIsArr = isArray(other), + objTag = objIsArr ? arrayTag : getTag(object), + othTag = othIsArr ? arrayTag : getTag(other); - return forward; -}; + objTag = objTag == argsTag ? objectTag : objTag; + othTag = othTag == argsTag ? objectTag : othTag; -// Note: |δλ| must be < 2π -function d3_geo_rotation(δλ, δφ, δγ) { - return δλ ? (δφ || δγ ? d3_geo_compose(d3_geo_rotationλ(δλ), d3_geo_rotationφγ(δφ, δγ)) - : d3_geo_rotationλ(δλ)) - : (δφ || δγ ? d3_geo_rotationφγ(δφ, δγ) - : d3_geo_equirectangular); -} + var objIsObj = objTag == objectTag, + othIsObj = othTag == objectTag, + isSameTag = objTag == othTag; -function d3_geo_forwardRotationλ(δλ) { - return function(λ, φ) { - return λ += δλ, [λ > π ? λ - 2 * π : λ < -π ? λ + 2 * π : λ, φ]; - }; -} - -function d3_geo_rotationλ(δλ) { - var rotation = d3_geo_forwardRotationλ(δλ); - rotation.invert = d3_geo_forwardRotationλ(-δλ); - return rotation; -} - -function d3_geo_rotationφγ(δφ, δγ) { - var cosδφ = Math.cos(δφ), - sinδφ = Math.sin(δφ), - cosδγ = Math.cos(δγ), - sinδγ = Math.sin(δγ); - - function rotation(λ, φ) { - var cosφ = Math.cos(φ), - x = Math.cos(λ) * cosφ, - y = Math.sin(λ) * cosφ, - z = Math.sin(φ), - k = z * cosδφ + x * sinδφ; - return [ - Math.atan2(y * cosδγ - k * sinδγ, x * cosδφ - z * sinδφ), - Math.asin(Math.max(-1, Math.min(1, k * cosδγ + y * sinδγ))) - ]; - } - - rotation.invert = function(λ, φ) { - var cosφ = Math.cos(φ), - x = Math.cos(λ) * cosφ, - y = Math.sin(λ) * cosφ, - z = Math.sin(φ), - k = z * cosδγ - y * sinδγ; - return [ - Math.atan2(y * cosδγ + z * sinδγ, x * cosδφ + k * sinδφ), - Math.asin(Math.max(-1, Math.min(1, k * cosδφ - x * sinδφ))) - ]; - }; - - return rotation; -} - -d3.geo.circle = function() { - var origin = [0, 0], - angle, - precision = 6, - interpolate; - - function circle() { - var center = typeof origin === "function" ? origin.apply(this, arguments) : origin, - rotate = d3_geo_rotation(-center[0] * d3_radians, -center[1] * d3_radians, 0).invert, - ring = []; - - interpolate(null, null, 1, { - point: function(x, y) { - ring.push(x = rotate(x, y)); - x[0] *= d3_degrees, x[1] *= d3_degrees; + if (isSameTag && isBuffer(object)) { + if (!isBuffer(other)) { + return false; + } + objIsArr = true; + objIsObj = false; } - }); - - return {type: "Polygon", coordinates: [ring]}; - } - - circle.origin = function(x) { - if (!arguments.length) return origin; - origin = x; - return circle; - }; - - circle.angle = function(x) { - if (!arguments.length) return angle; - interpolate = d3_geo_circleInterpolate((angle = +x) * d3_radians, precision * d3_radians); - return circle; - }; - - circle.precision = function(_) { - if (!arguments.length) return precision; - interpolate = d3_geo_circleInterpolate(angle * d3_radians, (precision = +_) * d3_radians); - return circle; - }; + if (isSameTag && !objIsObj) { + stack || (stack = new Stack); + return (objIsArr || isTypedArray(object)) + ? equalArrays(object, other, bitmask, customizer, equalFunc, stack) + : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack); + } + if (!(bitmask & COMPARE_PARTIAL_FLAG)) { + var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'), + othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__'); - return circle.angle(90); -}; + if (objIsWrapped || othIsWrapped) { + var objUnwrapped = objIsWrapped ? object.value() : object, + othUnwrapped = othIsWrapped ? other.value() : other; -// Interpolates along a circle centered at [0°, 0°], with a given radius and -// precision. -function d3_geo_circleInterpolate(radius, precision) { - var cr = Math.cos(radius), - sr = Math.sin(radius); - return function(from, to, direction, listener) { - if (from != null) { - from = d3_geo_circleAngle(cr, from); - to = d3_geo_circleAngle(cr, to); - if (direction > 0 ? from < to: from > to) from += direction * 2 * π; - } else { - from = radius + direction * 2 * π; - to = radius; - } - var point; - for (var step = direction * precision, t = from; direction > 0 ? t > to : t < to; t -= step) { - listener.point((point = d3_geo_spherical([ - cr, - -sr * Math.cos(t), - -sr * Math.sin(t) - ]))[0], point[1]); + stack || (stack = new Stack); + return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack); + } + } + if (!isSameTag) { + return false; + } + stack || (stack = new Stack); + return equalObjects(object, other, bitmask, customizer, equalFunc, stack); } - }; -} - -// Signed angle of a cartesian point relative to [cr, 0, 0]. -function d3_geo_circleAngle(cr, point) { - var a = d3_geo_cartesian(point); - a[0] -= cr; - d3_geo_cartesianNormalize(a); - var angle = d3_acos(-a[1]); - return ((-a[2] < 0 ? -angle : angle) + 2 * Math.PI - ε) % (2 * Math.PI); -} -// Clip features against a small circle centered at [0°, 0°]. -function d3_geo_clipCircle(radius) { - var cr = Math.cos(radius), - smallRadius = cr > 0, - notHemisphere = Math.abs(cr) > ε, // TODO optimise for this common case - interpolate = d3_geo_circleInterpolate(radius, 6 * d3_radians); + /** + * The base implementation of `_.isMap` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a map, else `false`. + */ + function baseIsMap(value) { + return isObjectLike(value) && getTag(value) == mapTag; + } - return d3_geo_clip(visible, clipLine, interpolate); + /** + * The base implementation of `_.isMatch` without support for iteratee shorthands. + * + * @private + * @param {Object} object The object to inspect. + * @param {Object} source The object of property values to match. + * @param {Array} matchData The property names, values, and compare flags to match. + * @param {Function} [customizer] The function to customize comparisons. + * @returns {boolean} Returns `true` if `object` is a match, else `false`. + */ + function baseIsMatch(object, source, matchData, customizer) { + var index = matchData.length, + length = index, + noCustomizer = !customizer; - function visible(λ, φ) { - return Math.cos(λ) * Math.cos(φ) > cr; - } + if (object == null) { + return !length; + } + object = Object(object); + while (index--) { + var data = matchData[index]; + if ((noCustomizer && data[2]) + ? data[1] !== object[data[0]] + : !(data[0] in object) + ) { + return false; + } + } + while (++index < length) { + data = matchData[index]; + var key = data[0], + objValue = object[key], + srcValue = data[1]; - // Takes a line and cuts into visible segments. Return values used for - // polygon clipping: - // 0: there were intersections or the line was empty. - // 1: no intersections. - // 2: there were intersections, and the first and last segments should be - // rejoined. - function clipLine(listener) { - var point0, // previous point - c0, // code for previous point - v0, // visibility of previous point - v00, // visibility of first point - clean; // no intersections - return { - lineStart: function() { - v00 = v0 = false; - clean = 1; - }, - point: function(λ, φ) { - var point1 = [λ, φ], - point2, - v = visible(λ, φ), - c = smallRadius - ? v ? 0 : code(λ, φ) - : v ? code(λ + (λ < 0 ? π : -π), φ) : 0; - if (!point0 && (v00 = v0 = v)) listener.lineStart(); - // Handle degeneracies. - // TODO ignore if not clipping polygons. - if (v !== v0) { - point2 = intersect(point0, point1); - if (d3_geo_sphericalEqual(point0, point2) || d3_geo_sphericalEqual(point1, point2)) { - point1[0] += ε; - point1[1] += ε; - v = visible(point1[0], point1[1]); + if (noCustomizer && data[2]) { + if (objValue === undefined && !(key in object)) { + return false; } - } - if (v !== v0) { - clean = 0; - if (v) { - // outside going in - listener.lineStart(); - point2 = intersect(point1, point0); - listener.point(point2[0], point2[1]); - } else { - // inside going out - point2 = intersect(point0, point1); - listener.point(point2[0], point2[1]); - listener.lineEnd(); + } else { + var stack = new Stack; + if (customizer) { + var result = customizer(objValue, srcValue, key, object, source, stack); } - point0 = point2; - } else if (notHemisphere && point0 && smallRadius ^ v) { - var t; - // If the codes for two points are different, or are both zero, - // and there this segment intersects with the small circle. - if (!(c & c0) && (t = intersect(point1, point0, true))) { - clean = 0; - if (smallRadius) { - listener.lineStart(); - listener.point(t[0][0], t[0][1]); - listener.point(t[1][0], t[1][1]); - listener.lineEnd(); - } else { - listener.point(t[1][0], t[1][1]); - listener.lineEnd(); - listener.lineStart(); - listener.point(t[0][0], t[0][1]); - } + if (!(result === undefined + ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack) + : result + )) { + return false; } } - if (v && (!point0 || !d3_geo_sphericalEqual(point0, point1))) { - listener.point(point1[0], point1[1]); - } - point0 = point1, v0 = v, c0 = c; - }, - lineEnd: function() { - if (v0) listener.lineEnd(); - point0 = null; - }, - // Rejoin first and last segments if there were intersections and the first - // and last points were visible. - clean: function() { return clean | ((v00 && v0) << 1); } - }; - } - - // Intersects the great circle between a and b with the clip circle. - function intersect(a, b, two) { - var pa = d3_geo_cartesian(a), - pb = d3_geo_cartesian(b); - - // We have two planes, n1.p = d1 and n2.p = d2. - // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2). - var n1 = [1, 0, 0], // normal - n2 = d3_geo_cartesianCross(pa, pb), - n2n2 = d3_geo_cartesianDot(n2, n2), - n1n2 = n2[0], // d3_geo_cartesianDot(n1, n2), - determinant = n2n2 - n1n2 * n1n2; - - // Two polar points. - if (!determinant) return !two && a; - - var c1 = cr * n2n2 / determinant, - c2 = -cr * n1n2 / determinant, - n1xn2 = d3_geo_cartesianCross(n1, n2), - A = d3_geo_cartesianScale(n1, c1), - B = d3_geo_cartesianScale(n2, c2); - d3_geo_cartesianAdd(A, B); - - // Solve |p(t)|^2 = 1. - var u = n1xn2, - w = d3_geo_cartesianDot(A, u), - uu = d3_geo_cartesianDot(u, u), - t2 = w * w - uu * (d3_geo_cartesianDot(A, A) - 1); - - if (t2 < 0) return; - - var t = Math.sqrt(t2), - q = d3_geo_cartesianScale(u, (-w - t) / uu); - d3_geo_cartesianAdd(q, A); - q = d3_geo_spherical(q); - if (!two) return q; - - // Two intersection points. - var λ0 = a[0], - λ1 = b[0], - φ0 = a[1], - φ1 = b[1], - z; - if (λ1 < λ0) z = λ0, λ0 = λ1, λ1 = z; - var δλ = λ1 - λ0, - polar = Math.abs(δλ - π) < ε, - meridian = polar || δλ < ε; - - if (!polar && φ1 < φ0) z = φ0, φ0 = φ1, φ1 = z; + } + return true; + } - // Check that the first point is between a and b. - if (meridian - ? polar - ? φ0 + φ1 > 0 ^ q[1] < (Math.abs(q[0] - λ0) < ε ? φ0 : φ1) - : φ0 <= q[1] && q[1] <= φ1 - : δλ > π ^ (λ0 <= q[0] && q[0] <= λ1)) { - var q1 = d3_geo_cartesianScale(u, (-w + t) / uu); - d3_geo_cartesianAdd(q1, A); - return [q, d3_geo_spherical(q1)]; + /** + * The base implementation of `_.isNative` without bad shim checks. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a native function, + * else `false`. + */ + function baseIsNative(value) { + if (!isObject(value) || isMasked(value)) { + return false; + } + var pattern = isFunction(value) ? reIsNative : reIsHostCtor; + return pattern.test(toSource(value)); } - } - // Generates a 4-bit vector representing the location of a point relative to - // the small circle's bounding box. - function code(λ, φ) { - var r = smallRadius ? radius : π - radius, - code = 0; - if (λ < -r) code |= 1; // left - else if (λ > r) code |= 2; // right - if (φ < -r) code |= 4; // below - else if (φ > r) code |= 8; // above - return code; - } -} + /** + * The base implementation of `_.isRegExp` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a regexp, else `false`. + */ + function baseIsRegExp(value) { + return isObjectLike(value) && baseGetTag(value) == regexpTag; + } -var d3_geo_clipViewMAX = 1e9; + /** + * The base implementation of `_.isSet` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a set, else `false`. + */ + function baseIsSet(value) { + return isObjectLike(value) && getTag(value) == setTag; + } -function d3_geo_clipView(x0, y0, x1, y1) { - return function(listener) { - var listener_ = listener, - bufferListener = d3_geo_clipBufferListener(), - segments, - polygon, - ring; + /** + * The base implementation of `_.isTypedArray` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a typed array, else `false`. + */ + function baseIsTypedArray(value) { + return isObjectLike(value) && + isLength(value.length) && !!typedArrayTags[baseGetTag(value)]; + } - var clip = { - point: point, - lineStart: lineStart, - lineEnd: lineEnd, - polygonStart: function() { - listener = bufferListener; - segments = []; - polygon = []; - }, - polygonEnd: function() { - listener = listener_; - if ((segments = d3.merge(segments)).length) { - listener.polygonStart(); - d3_geo_clipPolygon(segments, compare, inside, interpolate, listener); - listener.polygonEnd(); - } else if (insidePolygon([x0, y0])) { - listener.polygonStart(), listener.lineStart(); - interpolate(null, null, 1, listener); - listener.lineEnd(), listener.polygonEnd(); - } - segments = polygon = ring = null; + /** + * The base implementation of `_.iteratee`. + * + * @private + * @param {*} [value=_.identity] The value to convert to an iteratee. + * @returns {Function} Returns the iteratee. + */ + function baseIteratee(value) { + // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9. + // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details. + if (typeof value == 'function') { + return value; } - }; - - function inside(point) { - var a = corner(point, -1), - i = insidePolygon([a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0]); - return i; + if (value == null) { + return identity; + } + if (typeof value == 'object') { + return isArray(value) + ? baseMatchesProperty(value[0], value[1]) + : baseMatches(value); + } + return property(value); } - function insidePolygon(p) { - var wn = 0, // the winding number counter - n = polygon.length, - y = p[1]; - - for (var i = 0; i < n; ++i) { - for (var j = 1, v = polygon[i], m = v.length, a = v[0]; j < m; ++j) { - b = v[j]; - if (a[1] <= y) { - if (b[1] > y && isLeft(a, b, p) > 0) ++wn; - } else { - if (b[1] <= y && isLeft(a, b, p) < 0) --wn; - } - a = b; + /** + * The base implementation of `_.keys` which doesn't treat sparse arrays as dense. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + */ + function baseKeys(object) { + if (!isPrototype(object)) { + return nativeKeys(object); + } + var result = []; + for (var key in Object(object)) { + if (hasOwnProperty.call(object, key) && key != 'constructor') { + result.push(key); } } - return wn !== 0; + return result; } - function isLeft(a, b, c) { - return (b[0] - a[0]) * (c[1] - a[1]) - (c[0] - a[0]) * (b[1] - a[1]); - } + /** + * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + */ + function baseKeysIn(object) { + if (!isObject(object)) { + return nativeKeysIn(object); + } + var isProto = isPrototype(object), + result = []; - function interpolate(from, to, direction, listener) { - var a = 0, a1 = 0; - if (from == null || - (a = corner(from, direction)) !== (a1 = corner(to, direction)) || - comparePoints(from, to) < 0 ^ direction > 0) { - do { - listener.point(a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0); - } while ((a = (a + direction + 4) % 4) !== a1); - } else { - listener.point(to[0], to[1]); + for (var key in object) { + if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) { + result.push(key); + } } + return result; } - function visible(x, y) { - return x0 <= x && x <= x1 && y0 <= y && y <= y1; + /** + * The base implementation of `_.lt` which doesn't coerce arguments. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is less than `other`, + * else `false`. + */ + function baseLt(value, other) { + return value < other; } - function point(x, y) { - if (visible(x, y)) listener.point(x, y); - } + /** + * The base implementation of `_.map` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns the new mapped array. + */ + function baseMap(collection, iteratee) { + var index = -1, + result = isArrayLike(collection) ? Array(collection.length) : []; - var x__, y__, v__, // first point - x_, y_, v_, // previous point - first; + baseEach(collection, function(value, key, collection) { + result[++index] = iteratee(value, key, collection); + }); + return result; + } - function lineStart() { - clip.point = linePoint; - if (polygon) polygon.push(ring = []); - first = true; - v_ = false; - x_ = y_ = NaN; + /** + * The base implementation of `_.matches` which doesn't clone `source`. + * + * @private + * @param {Object} source The object of property values to match. + * @returns {Function} Returns the new spec function. + */ + function baseMatches(source) { + var matchData = getMatchData(source); + if (matchData.length == 1 && matchData[0][2]) { + return matchesStrictComparable(matchData[0][0], matchData[0][1]); + } + return function(object) { + return object === source || baseIsMatch(object, source, matchData); + }; } - function lineEnd() { - // TODO rather than special-case polygons, simply handle them separately. - // Ideally, coincident intersection points should be jittered to avoid - // clipping issues. - if (segments) { - linePoint(x__, y__); - if (v__ && v_) bufferListener.rejoin(); - segments.push(bufferListener.buffer()); + /** + * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`. + * + * @private + * @param {string} path The path of the property to get. + * @param {*} srcValue The value to match. + * @returns {Function} Returns the new spec function. + */ + function baseMatchesProperty(path, srcValue) { + if (isKey(path) && isStrictComparable(srcValue)) { + return matchesStrictComparable(toKey(path), srcValue); } - clip.point = point; - if (v_) listener.lineEnd(); + return function(object) { + var objValue = get(object, path); + return (objValue === undefined && objValue === srcValue) + ? hasIn(object, path) + : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG); + }; } - function linePoint(x, y) { - x = Math.max(-d3_geo_clipViewMAX, Math.min(d3_geo_clipViewMAX, x)); - y = Math.max(-d3_geo_clipViewMAX, Math.min(d3_geo_clipViewMAX, y)); - var v = visible(x, y); - if (polygon) ring.push([x, y]); - if (first) { - x__ = x, y__ = y, v__ = v; - first = false; - if (v) { - listener.lineStart(); - listener.point(x, y); + /** + * The base implementation of `_.merge` without support for multiple sources. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @param {number} srcIndex The index of `source`. + * @param {Function} [customizer] The function to customize merged values. + * @param {Object} [stack] Tracks traversed source values and their merged + * counterparts. + */ + function baseMerge(object, source, srcIndex, customizer, stack) { + if (object === source) { + return; + } + baseFor(source, function(srcValue, key) { + if (isObject(srcValue)) { + stack || (stack = new Stack); + baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack); } - } else { - if (v && v_) listener.point(x, y); else { - var a = [x_, y_], - b = [x, y]; - if (clipLine(a, b)) { - if (!v_) { - listener.lineStart(); - listener.point(a[0], a[1]); - } - listener.point(b[0], b[1]); - if (!v) listener.lineEnd(); - } else { - listener.lineStart(); - listener.point(x, y); + var newValue = customizer + ? customizer(object[key], srcValue, (key + ''), object, source, stack) + : undefined; + + if (newValue === undefined) { + newValue = srcValue; } + assignMergeValue(object, key, newValue); } - } - x_ = x, y_ = y, v_ = v; + }, keysIn); } - return clip; - }; - - function corner(p, direction) { - return Math.abs(p[0] - x0) < ε ? direction > 0 ? 0 : 3 - : Math.abs(p[0] - x1) < ε ? direction > 0 ? 2 : 1 - : Math.abs(p[1] - y0) < ε ? direction > 0 ? 1 : 0 - : direction > 0 ? 3 : 2; // Math.abs(p[1] - y1) < ε - } - - function compare(a, b) { - return comparePoints(a.point, b.point); - } + /** + * A specialized version of `baseMerge` for arrays and objects which performs + * deep merges and tracks traversed objects enabling objects with circular + * references to be merged. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @param {string} key The key of the value to merge. + * @param {number} srcIndex The index of `source`. + * @param {Function} mergeFunc The function to merge values. + * @param {Function} [customizer] The function to customize assigned values. + * @param {Object} [stack] Tracks traversed source values and their merged + * counterparts. + */ + function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) { + var objValue = object[key], + srcValue = source[key], + stacked = stack.get(srcValue); - function comparePoints(a, b) { - var ca = corner(a, 1), - cb = corner(b, 1); - return ca !== cb ? ca - cb - : ca === 0 ? b[1] - a[1] - : ca === 1 ? a[0] - b[0] - : ca === 2 ? a[1] - b[1] - : b[0] - a[0]; - } + if (stacked) { + assignMergeValue(object, key, stacked); + return; + } + var newValue = customizer + ? customizer(objValue, srcValue, (key + ''), object, source, stack) + : undefined; - // Liang–Barsky line clipping. - function clipLine(a, b) { - var dx = b[0] - a[0], - dy = b[1] - a[1], - t = [0, 1]; + var isCommon = newValue === undefined; - if (Math.abs(dx) < ε && Math.abs(dy) < ε) return x0 <= a[0] && a[0] <= x1 && y0 <= a[1] && a[1] <= y1; + if (isCommon) { + var isArr = isArray(srcValue), + isBuff = !isArr && isBuffer(srcValue), + isTyped = !isArr && !isBuff && isTypedArray(srcValue); - if (d3_geo_clipViewT(x0 - a[0], dx, t) && - d3_geo_clipViewT(a[0] - x1, -dx, t) && - d3_geo_clipViewT(y0 - a[1], dy, t) && - d3_geo_clipViewT(a[1] - y1, -dy, t)) { - if (t[1] < 1) { - b[0] = a[0] + t[1] * dx; - b[1] = a[1] + t[1] * dy; + newValue = srcValue; + if (isArr || isBuff || isTyped) { + if (isArray(objValue)) { + newValue = objValue; + } + else if (isArrayLikeObject(objValue)) { + newValue = copyArray(objValue); + } + else if (isBuff) { + isCommon = false; + newValue = cloneBuffer(srcValue, true); + } + else if (isTyped) { + isCommon = false; + newValue = cloneTypedArray(srcValue, true); + } + else { + newValue = []; + } + } + else if (isPlainObject(srcValue) || isArguments(srcValue)) { + newValue = objValue; + if (isArguments(objValue)) { + newValue = toPlainObject(objValue); + } + else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) { + newValue = initCloneObject(srcValue); + } + } + else { + isCommon = false; + } } - if (t[0] > 0) { - a[0] += t[0] * dx; - a[1] += t[0] * dy; + if (isCommon) { + // Recursively merge objects and arrays (susceptible to call stack limits). + stack.set(srcValue, newValue); + mergeFunc(newValue, srcValue, srcIndex, customizer, stack); + stack['delete'](srcValue); } - return true; + assignMergeValue(object, key, newValue); } - return false; - } -} + /** + * The base implementation of `_.nth` which doesn't coerce arguments. + * + * @private + * @param {Array} array The array to query. + * @param {number} n The index of the element to return. + * @returns {*} Returns the nth element of `array`. + */ + function baseNth(array, n) { + var length = array.length; + if (!length) { + return; + } + n += n < 0 ? length : 0; + return isIndex(n, length) ? array[n] : undefined; + } -function d3_geo_clipViewT(num, denominator, t) { - if (Math.abs(denominator) < ε) return num <= 0; + /** + * The base implementation of `_.orderBy` without param guards. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by. + * @param {string[]} orders The sort orders of `iteratees`. + * @returns {Array} Returns the new sorted array. + */ + function baseOrderBy(collection, iteratees, orders) { + var index = -1; + iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(getIteratee())); - var u = num / denominator; + var result = baseMap(collection, function(value, key, collection) { + var criteria = arrayMap(iteratees, function(iteratee) { + return iteratee(value); + }); + return { 'criteria': criteria, 'index': ++index, 'value': value }; + }); - if (denominator > 0) { - if (u > t[1]) return false; - if (u > t[0]) t[0] = u; - } else { - if (u < t[0]) return false; - if (u < t[1]) t[1] = u; - } - return true; -} -function d3_geo_compose(a, b) { + return baseSortBy(result, function(object, other) { + return compareMultiple(object, other, orders); + }); + } - function compose(x, y) { - return x = a(x, y), b(x[0], x[1]); - } + /** + * The base implementation of `_.pick` without support for individual + * property identifiers. + * + * @private + * @param {Object} object The source object. + * @param {string[]} paths The property paths to pick. + * @returns {Object} Returns the new object. + */ + function basePick(object, paths) { + return basePickBy(object, paths, function(value, path) { + return hasIn(object, path); + }); + } - if (a.invert && b.invert) compose.invert = function(x, y) { - return x = b.invert(x, y), x && a.invert(x[0], x[1]); - }; + /** + * The base implementation of `_.pickBy` without support for iteratee shorthands. + * + * @private + * @param {Object} object The source object. + * @param {string[]} paths The property paths to pick. + * @param {Function} predicate The function invoked per property. + * @returns {Object} Returns the new object. + */ + function basePickBy(object, paths, predicate) { + var index = -1, + length = paths.length, + result = {}; - return compose; -} + while (++index < length) { + var path = paths[index], + value = baseGet(object, path); -d3.geo.stream = function(object, listener) { - if (d3_geo_streamObjectType.hasOwnProperty(object.type)) { - d3_geo_streamObjectType[object.type](object, listener); - } else { - d3_geo_streamGeometry(object, listener); - } -}; + if (predicate(value, path)) { + baseSet(result, castPath(path, object), value); + } + } + return result; + } -function d3_geo_streamGeometry(geometry, listener) { - if (d3_geo_streamGeometryType.hasOwnProperty(geometry.type)) { - d3_geo_streamGeometryType[geometry.type](geometry, listener); - } -} + /** + * A specialized version of `baseProperty` which supports deep paths. + * + * @private + * @param {Array|string} path The path of the property to get. + * @returns {Function} Returns the new accessor function. + */ + function basePropertyDeep(path) { + return function(object) { + return baseGet(object, path); + }; + } -var d3_geo_streamObjectType = { - Feature: function(feature, listener) { - d3_geo_streamGeometry(feature.geometry, listener); - }, - FeatureCollection: function(object, listener) { - var features = object.features, i = -1, n = features.length; - while (++i < n) d3_geo_streamGeometry(features[i].geometry, listener); - } -}; + /** + * The base implementation of `_.pullAllBy` without support for iteratee + * shorthands. + * + * @private + * @param {Array} array The array to modify. + * @param {Array} values The values to remove. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns `array`. + */ + function basePullAll(array, values, iteratee, comparator) { + var indexOf = comparator ? baseIndexOfWith : baseIndexOf, + index = -1, + length = values.length, + seen = array; + + if (array === values) { + values = copyArray(values); + } + if (iteratee) { + seen = arrayMap(array, baseUnary(iteratee)); + } + while (++index < length) { + var fromIndex = 0, + value = values[index], + computed = iteratee ? iteratee(value) : value; -var d3_geo_streamGeometryType = { - Sphere: function(object, listener) { - listener.sphere(); - }, - Point: function(object, listener) { - var coordinate = object.coordinates; - listener.point(coordinate[0], coordinate[1]); - }, - MultiPoint: function(object, listener) { - var coordinates = object.coordinates, i = -1, n = coordinates.length, coordinate; - while (++i < n) coordinate = coordinates[i], listener.point(coordinate[0], coordinate[1]); - }, - LineString: function(object, listener) { - d3_geo_streamLine(object.coordinates, listener, 0); - }, - MultiLineString: function(object, listener) { - var coordinates = object.coordinates, i = -1, n = coordinates.length; - while (++i < n) d3_geo_streamLine(coordinates[i], listener, 0); - }, - Polygon: function(object, listener) { - d3_geo_streamPolygon(object.coordinates, listener); - }, - MultiPolygon: function(object, listener) { - var coordinates = object.coordinates, i = -1, n = coordinates.length; - while (++i < n) d3_geo_streamPolygon(coordinates[i], listener); - }, - GeometryCollection: function(object, listener) { - var geometries = object.geometries, i = -1, n = geometries.length; - while (++i < n) d3_geo_streamGeometry(geometries[i], listener); - } -}; + while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) { + if (seen !== array) { + splice.call(seen, fromIndex, 1); + } + splice.call(array, fromIndex, 1); + } + } + return array; + } -function d3_geo_streamLine(coordinates, listener, closed) { - var i = -1, n = coordinates.length - closed, coordinate; - listener.lineStart(); - while (++i < n) coordinate = coordinates[i], listener.point(coordinate[0], coordinate[1]); - listener.lineEnd(); -} + /** + * The base implementation of `_.pullAt` without support for individual + * indexes or capturing the removed elements. + * + * @private + * @param {Array} array The array to modify. + * @param {number[]} indexes The indexes of elements to remove. + * @returns {Array} Returns `array`. + */ + function basePullAt(array, indexes) { + var length = array ? indexes.length : 0, + lastIndex = length - 1; -function d3_geo_streamPolygon(coordinates, listener) { - var i = -1, n = coordinates.length; - listener.polygonStart(); - while (++i < n) d3_geo_streamLine(coordinates[i], listener, 1); - listener.polygonEnd(); -} + while (length--) { + var index = indexes[length]; + if (length == lastIndex || index !== previous) { + var previous = index; + if (isIndex(index)) { + splice.call(array, index, 1); + } else { + baseUnset(array, index); + } + } + } + return array; + } + + /** + * The base implementation of `_.random` without support for returning + * floating-point numbers. + * + * @private + * @param {number} lower The lower bound. + * @param {number} upper The upper bound. + * @returns {number} Returns the random number. + */ + function baseRandom(lower, upper) { + return lower + nativeFloor(nativeRandom() * (upper - lower + 1)); + } -function d3_geo_resample(project) { - var δ2 = .5, // precision, px² - maxDepth = 16; + /** + * The base implementation of `_.range` and `_.rangeRight` which doesn't + * coerce arguments. + * + * @private + * @param {number} start The start of the range. + * @param {number} end The end of the range. + * @param {number} step The value to increment or decrement by. + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Array} Returns the range of numbers. + */ + function baseRange(start, end, step, fromRight) { + var index = -1, + length = nativeMax(nativeCeil((end - start) / (step || 1)), 0), + result = Array(length); - function resample(stream) { - var λ0, x0, y0, a0, b0, c0; // previous point + while (length--) { + result[fromRight ? length : ++index] = start; + start += step; + } + return result; + } - var resample = { - point: point, - lineStart: lineStart, - lineEnd: lineEnd, - polygonStart: function() { stream.polygonStart(); resample.lineStart = polygonLineStart; }, - polygonEnd: function() { stream.polygonEnd(); resample.lineStart = lineStart; } - }; + /** + * The base implementation of `_.repeat` which doesn't coerce arguments. + * + * @private + * @param {string} string The string to repeat. + * @param {number} n The number of times to repeat the string. + * @returns {string} Returns the repeated string. + */ + function baseRepeat(string, n) { + var result = ''; + if (!string || n < 1 || n > MAX_SAFE_INTEGER) { + return result; + } + // Leverage the exponentiation by squaring algorithm for a faster repeat. + // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details. + do { + if (n % 2) { + result += string; + } + n = nativeFloor(n / 2); + if (n) { + string += string; + } + } while (n); - function point(x, y) { - x = project(x, y); - stream.point(x[0], x[1]); + return result; } - function lineStart() { - x0 = NaN; - resample.point = linePoint; - stream.lineStart(); + /** + * The base implementation of `_.rest` which doesn't validate or coerce arguments. + * + * @private + * @param {Function} func The function to apply a rest parameter to. + * @param {number} [start=func.length-1] The start position of the rest parameter. + * @returns {Function} Returns the new function. + */ + function baseRest(func, start) { + return setToString(overRest(func, start, identity), func + ''); } - function linePoint(λ, φ) { - var c = d3_geo_cartesian([λ, φ]), p = project(λ, φ); - resampleLineTo(x0, y0, λ0, a0, b0, c0, x0 = p[0], y0 = p[1], λ0 = λ, a0 = c[0], b0 = c[1], c0 = c[2], maxDepth, stream); - stream.point(x0, y0); + /** + * The base implementation of `_.sample`. + * + * @private + * @param {Array|Object} collection The collection to sample. + * @returns {*} Returns the random element. + */ + function baseSample(collection) { + return arraySample(values(collection)); } - function lineEnd() { - resample.point = point; - stream.lineEnd(); + /** + * The base implementation of `_.sampleSize` without param guards. + * + * @private + * @param {Array|Object} collection The collection to sample. + * @param {number} n The number of elements to sample. + * @returns {Array} Returns the random elements. + */ + function baseSampleSize(collection, n) { + var array = values(collection); + return shuffleSelf(array, baseClamp(n, 0, array.length)); } - function polygonLineStart() { - var λ00, φ00, x00, y00, a00, b00, c00; // first point + /** + * The base implementation of `_.set`. + * + * @private + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {*} value The value to set. + * @param {Function} [customizer] The function to customize path creation. + * @returns {Object} Returns `object`. + */ + function baseSet(object, path, value, customizer) { + if (!isObject(object)) { + return object; + } + path = castPath(path, object); - lineStart(); + var index = -1, + length = path.length, + lastIndex = length - 1, + nested = object; + + while (nested != null && ++index < length) { + var key = toKey(path[index]), + newValue = value; + + if (index != lastIndex) { + var objValue = nested[key]; + newValue = customizer ? customizer(objValue, key, nested) : undefined; + if (newValue === undefined) { + newValue = isObject(objValue) + ? objValue + : (isIndex(path[index + 1]) ? [] : {}); + } + } + assignValue(nested, key, newValue); + nested = nested[key]; + } + return object; + } - resample.point = function(λ, φ) { - linePoint(λ00 = λ, φ00 = φ), x00 = x0, y00 = y0, a00 = a0, b00 = b0, c00 = c0; - resample.point = linePoint; - }; + /** + * The base implementation of `setData` without support for hot loop shorting. + * + * @private + * @param {Function} func The function to associate metadata with. + * @param {*} data The metadata. + * @returns {Function} Returns `func`. + */ + var baseSetData = !metaMap ? identity : function(func, data) { + metaMap.set(func, data); + return func; + }; - resample.lineEnd = function() { - resampleLineTo(x0, y0, λ0, a0, b0, c0, x00, y00, λ00, a00, b00, c00, maxDepth, stream); - resample.lineEnd = lineEnd; - lineEnd(); - }; + /** + * The base implementation of `setToString` without support for hot loop shorting. + * + * @private + * @param {Function} func The function to modify. + * @param {Function} string The `toString` result. + * @returns {Function} Returns `func`. + */ + var baseSetToString = !defineProperty ? identity : function(func, string) { + return defineProperty(func, 'toString', { + 'configurable': true, + 'enumerable': false, + 'value': constant(string), + 'writable': true + }); + }; + + /** + * The base implementation of `_.shuffle`. + * + * @private + * @param {Array|Object} collection The collection to shuffle. + * @returns {Array} Returns the new shuffled array. + */ + function baseShuffle(collection) { + return shuffleSelf(values(collection)); } - return resample; - } + /** + * The base implementation of `_.slice` without an iteratee call guard. + * + * @private + * @param {Array} array The array to slice. + * @param {number} [start=0] The start position. + * @param {number} [end=array.length] The end position. + * @returns {Array} Returns the slice of `array`. + */ + function baseSlice(array, start, end) { + var index = -1, + length = array.length; - function resampleLineTo(x0, y0, λ0, a0, b0, c0, x1, y1, λ1, a1, b1, c1, depth, stream) { - var dx = x1 - x0, - dy = y1 - y0, - d2 = dx * dx + dy * dy; - if (d2 > 4 * δ2 && depth--) { - var a = a0 + a1, - b = b0 + b1, - c = c0 + c1, - m = Math.sqrt(a * a + b * b + c * c), - φ2 = Math.asin(c /= m), - λ2 = Math.abs(Math.abs(c) - 1) < ε ? (λ0 + λ1) / 2 : Math.atan2(b, a), - p = project(λ2, φ2), - x2 = p[0], - y2 = p[1], - dx2 = x2 - x0, - dy2 = y2 - y0, - dz = dy * dx2 - dx * dy2; - if (dz * dz / d2 > δ2 || Math.abs((dx * dx2 + dy * dy2) / d2 - .5) > .3) { - resampleLineTo(x0, y0, λ0, a0, b0, c0, x2, y2, λ2, a /= m, b /= m, c, depth, stream); - stream.point(x2, y2); - resampleLineTo(x2, y2, λ2, a, b, c, x1, y1, λ1, a1, b1, c1, depth, stream); + if (start < 0) { + start = -start > length ? 0 : (length + start); + } + end = end > length ? length : end; + if (end < 0) { + end += length; } + length = start > end ? 0 : ((end - start) >>> 0); + start >>>= 0; + + var result = Array(length); + while (++index < length) { + result[index] = array[index + start]; + } + return result; } - } - resample.precision = function(_) { - if (!arguments.length) return Math.sqrt(δ2); - maxDepth = (δ2 = _ * _) > 0 && 16; - return resample; - }; + /** + * The base implementation of `_.some` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {boolean} Returns `true` if any element passes the predicate check, + * else `false`. + */ + function baseSome(collection, predicate) { + var result; - return resample; -} + baseEach(collection, function(value, index, collection) { + result = predicate(value, index, collection); + return !result; + }); + return !!result; + } -d3.geo.projection = d3_geo_projection; -d3.geo.projectionMutator = d3_geo_projectionMutator; + /** + * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which + * performs a binary search of `array` to determine the index at which `value` + * should be inserted into `array` in order to maintain its sort order. + * + * @private + * @param {Array} array The sorted array to inspect. + * @param {*} value The value to evaluate. + * @param {boolean} [retHighest] Specify returning the highest qualified index. + * @returns {number} Returns the index at which `value` should be inserted + * into `array`. + */ + function baseSortedIndex(array, value, retHighest) { + var low = 0, + high = array == null ? low : array.length; + + if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) { + while (low < high) { + var mid = (low + high) >>> 1, + computed = array[mid]; + + if (computed !== null && !isSymbol(computed) && + (retHighest ? (computed <= value) : (computed < value))) { + low = mid + 1; + } else { + high = mid; + } + } + return high; + } + return baseSortedIndexBy(array, value, identity, retHighest); + } -function d3_geo_projection(project) { - return d3_geo_projectionMutator(function() { return project; })(); -} + /** + * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy` + * which invokes `iteratee` for `value` and each element of `array` to compute + * their sort ranking. The iteratee is invoked with one argument; (value). + * + * @private + * @param {Array} array The sorted array to inspect. + * @param {*} value The value to evaluate. + * @param {Function} iteratee The iteratee invoked per element. + * @param {boolean} [retHighest] Specify returning the highest qualified index. + * @returns {number} Returns the index at which `value` should be inserted + * into `array`. + */ + function baseSortedIndexBy(array, value, iteratee, retHighest) { + value = iteratee(value); + + var low = 0, + high = array == null ? 0 : array.length, + valIsNaN = value !== value, + valIsNull = value === null, + valIsSymbol = isSymbol(value), + valIsUndefined = value === undefined; + + while (low < high) { + var mid = nativeFloor((low + high) / 2), + computed = iteratee(array[mid]), + othIsDefined = computed !== undefined, + othIsNull = computed === null, + othIsReflexive = computed === computed, + othIsSymbol = isSymbol(computed); + + if (valIsNaN) { + var setLow = retHighest || othIsReflexive; + } else if (valIsUndefined) { + setLow = othIsReflexive && (retHighest || othIsDefined); + } else if (valIsNull) { + setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull); + } else if (valIsSymbol) { + setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol); + } else if (othIsNull || othIsSymbol) { + setLow = false; + } else { + setLow = retHighest ? (computed <= value) : (computed < value); + } + if (setLow) { + low = mid + 1; + } else { + high = mid; + } + } + return nativeMin(high, MAX_ARRAY_INDEX); + } -function d3_geo_projectionMutator(projectAt) { - var project, - rotate, - projectRotate, - projectResample = d3_geo_resample(function(x, y) { x = project(x, y); return [x[0] * k + δx, δy - x[1] * k]; }), - k = 150, // scale - x = 480, y = 250, // translate - λ = 0, φ = 0, // center - δλ = 0, δφ = 0, δγ = 0, // rotate - δx, δy, // center - preclip = d3_geo_clipAntimeridian, - postclip = d3_identity, - clipAngle = null, - clipExtent = null; + /** + * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without + * support for iteratee shorthands. + * + * @private + * @param {Array} array The array to inspect. + * @param {Function} [iteratee] The iteratee invoked per element. + * @returns {Array} Returns the new duplicate free array. + */ + function baseSortedUniq(array, iteratee) { + var index = -1, + length = array.length, + resIndex = 0, + result = []; - function projection(point) { - point = projectRotate(point[0] * d3_radians, point[1] * d3_radians); - return [point[0] * k + δx, δy - point[1] * k]; - } + while (++index < length) { + var value = array[index], + computed = iteratee ? iteratee(value) : value; - function invert(point) { - point = projectRotate.invert((point[0] - δx) / k, (δy - point[1]) / k); - return point && [point[0] * d3_degrees, point[1] * d3_degrees]; - } + if (!index || !eq(computed, seen)) { + var seen = computed; + result[resIndex++] = value === 0 ? 0 : value; + } + } + return result; + } - projection.stream = function(stream) { - return d3_geo_projectionRadiansRotate(rotate, preclip(projectResample(postclip(stream)))); - }; + /** + * The base implementation of `_.toNumber` which doesn't ensure correct + * conversions of binary, hexadecimal, or octal string values. + * + * @private + * @param {*} value The value to process. + * @returns {number} Returns the number. + */ + function baseToNumber(value) { + if (typeof value == 'number') { + return value; + } + if (isSymbol(value)) { + return NAN; + } + return +value; + } - projection.clipAngle = function(_) { - if (!arguments.length) return clipAngle; - preclip = _ == null ? (clipAngle = _, d3_geo_clipAntimeridian) : d3_geo_clipCircle((clipAngle = +_) * d3_radians); - return projection; - }; + /** + * The base implementation of `_.toString` which doesn't convert nullish + * values to empty strings. + * + * @private + * @param {*} value The value to process. + * @returns {string} Returns the string. + */ + function baseToString(value) { + // Exit early for strings to avoid a performance hit in some environments. + if (typeof value == 'string') { + return value; + } + if (isArray(value)) { + // Recursively convert values (susceptible to call stack limits). + return arrayMap(value, baseToString) + ''; + } + if (isSymbol(value)) { + return symbolToString ? symbolToString.call(value) : ''; + } + var result = (value + ''); + return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result; + } - projection.clipExtent = function(_) { - if (!arguments.length) return clipExtent; - clipExtent = _; - postclip = _ == null ? d3_identity : d3_geo_clipView(_[0][0], _[0][1], _[1][0], _[1][1]); - return projection; - }; + /** + * The base implementation of `_.uniqBy` without support for iteratee shorthands. + * + * @private + * @param {Array} array The array to inspect. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new duplicate free array. + */ + function baseUniq(array, iteratee, comparator) { + var index = -1, + includes = arrayIncludes, + length = array.length, + isCommon = true, + result = [], + seen = result; + + if (comparator) { + isCommon = false; + includes = arrayIncludesWith; + } + else if (length >= LARGE_ARRAY_SIZE) { + var set = iteratee ? null : createSet(array); + if (set) { + return setToArray(set); + } + isCommon = false; + includes = cacheHas; + seen = new SetCache; + } + else { + seen = iteratee ? [] : result; + } + outer: + while (++index < length) { + var value = array[index], + computed = iteratee ? iteratee(value) : value; + + value = (comparator || value !== 0) ? value : 0; + if (isCommon && computed === computed) { + var seenIndex = seen.length; + while (seenIndex--) { + if (seen[seenIndex] === computed) { + continue outer; + } + } + if (iteratee) { + seen.push(computed); + } + result.push(value); + } + else if (!includes(seen, computed, comparator)) { + if (seen !== result) { + seen.push(computed); + } + result.push(value); + } + } + return result; + } - projection.scale = function(_) { - if (!arguments.length) return k; - k = +_; - return reset(); - }; + /** + * The base implementation of `_.unset`. + * + * @private + * @param {Object} object The object to modify. + * @param {Array|string} path The property path to unset. + * @returns {boolean} Returns `true` if the property is deleted, else `false`. + */ + function baseUnset(object, path) { + path = castPath(path, object); + object = parent(object, path); + return object == null || delete object[toKey(last(path))]; + } - projection.translate = function(_) { - if (!arguments.length) return [x, y]; - x = +_[0]; - y = +_[1]; - return reset(); - }; + /** + * The base implementation of `_.update`. + * + * @private + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to update. + * @param {Function} updater The function to produce the updated value. + * @param {Function} [customizer] The function to customize path creation. + * @returns {Object} Returns `object`. + */ + function baseUpdate(object, path, updater, customizer) { + return baseSet(object, path, updater(baseGet(object, path)), customizer); + } - projection.center = function(_) { - if (!arguments.length) return [λ * d3_degrees, φ * d3_degrees]; - λ = _[0] % 360 * d3_radians; - φ = _[1] % 360 * d3_radians; - return reset(); - }; + /** + * The base implementation of methods like `_.dropWhile` and `_.takeWhile` + * without support for iteratee shorthands. + * + * @private + * @param {Array} array The array to query. + * @param {Function} predicate The function invoked per iteration. + * @param {boolean} [isDrop] Specify dropping elements instead of taking them. + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Array} Returns the slice of `array`. + */ + function baseWhile(array, predicate, isDrop, fromRight) { + var length = array.length, + index = fromRight ? length : -1; - projection.rotate = function(_) { - if (!arguments.length) return [δλ * d3_degrees, δφ * d3_degrees, δγ * d3_degrees]; - δλ = _[0] % 360 * d3_radians; - δφ = _[1] % 360 * d3_radians; - δγ = _.length > 2 ? _[2] % 360 * d3_radians : 0; - return reset(); - }; + while ((fromRight ? index-- : ++index < length) && + predicate(array[index], index, array)) {} - d3.rebind(projection, projectResample, "precision"); + return isDrop + ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length)) + : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index)); + } - function reset() { - projectRotate = d3_geo_compose(rotate = d3_geo_rotation(δλ, δφ, δγ), project); - var center = project(λ, φ); - δx = x - center[0] * k; - δy = y + center[1] * k; - return projection; - } + /** + * The base implementation of `wrapperValue` which returns the result of + * performing a sequence of actions on the unwrapped `value`, where each + * successive action is supplied the return value of the previous. + * + * @private + * @param {*} value The unwrapped value. + * @param {Array} actions Actions to perform to resolve the unwrapped value. + * @returns {*} Returns the resolved value. + */ + function baseWrapperValue(value, actions) { + var result = value; + if (result instanceof LazyWrapper) { + result = result.value(); + } + return arrayReduce(actions, function(result, action) { + return action.func.apply(action.thisArg, arrayPush([result], action.args)); + }, result); + } - return function() { - project = projectAt.apply(this, arguments); - projection.invert = project.invert && invert; - return reset(); - }; -} + /** + * The base implementation of methods like `_.xor`, without support for + * iteratee shorthands, that accepts an array of arrays to inspect. + * + * @private + * @param {Array} arrays The arrays to inspect. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of values. + */ + function baseXor(arrays, iteratee, comparator) { + var length = arrays.length; + if (length < 2) { + return length ? baseUniq(arrays[0]) : []; + } + var index = -1, + result = Array(length); -function d3_geo_projectionRadiansRotate(rotate, stream) { - return { - point: function(x, y) { - y = rotate(x * d3_radians, y * d3_radians), x = y[0]; - stream.point(x > π ? x - 2 * π : x < -π ? x + 2 * π : x, y[1]); - }, - sphere: function() { stream.sphere(); }, - lineStart: function() { stream.lineStart(); }, - lineEnd: function() { stream.lineEnd(); }, - polygonStart: function() { stream.polygonStart(); }, - polygonEnd: function() { stream.polygonEnd(); } - }; -} + while (++index < length) { + var array = arrays[index], + othIndex = -1; -function d3_geo_mercator(λ, φ) { - return [λ, Math.log(Math.tan(π / 4 + φ / 2))]; -} + while (++othIndex < length) { + if (othIndex != index) { + result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator); + } + } + } + return baseUniq(baseFlatten(result, 1), iteratee, comparator); + } -d3_geo_mercator.invert = function(x, y) { - return [x, 2 * Math.atan(Math.exp(y)) - π / 2]; -}; + /** + * This base implementation of `_.zipObject` which assigns values using `assignFunc`. + * + * @private + * @param {Array} props The property identifiers. + * @param {Array} values The property values. + * @param {Function} assignFunc The function to assign values. + * @returns {Object} Returns the new object. + */ + function baseZipObject(props, values, assignFunc) { + var index = -1, + length = props.length, + valsLength = values.length, + result = {}; -function d3_geo_mercatorProjection(project) { - var m = d3_geo_projection(project), - scale = m.scale, - translate = m.translate, - clipExtent = m.clipExtent, - clipAuto; + while (++index < length) { + var value = index < valsLength ? values[index] : undefined; + assignFunc(result, props[index], value); + } + return result; + } - m.scale = function() { - var v = scale.apply(m, arguments); - return v === m ? (clipAuto ? m.clipExtent(null) : m) : v; - }; + /** + * Casts `value` to an empty array if it's not an array like object. + * + * @private + * @param {*} value The value to inspect. + * @returns {Array|Object} Returns the cast array-like object. + */ + function castArrayLikeObject(value) { + return isArrayLikeObject(value) ? value : []; + } - m.translate = function() { - var v = translate.apply(m, arguments); - return v === m ? (clipAuto ? m.clipExtent(null) : m) : v; - }; + /** + * Casts `value` to `identity` if it's not a function. + * + * @private + * @param {*} value The value to inspect. + * @returns {Function} Returns cast function. + */ + function castFunction(value) { + return typeof value == 'function' ? value : identity; + } - m.clipExtent = function(_) { - var v = clipExtent.apply(m, arguments); - if (v === m) { - if (clipAuto = _ == null) { - var k = π * scale(), t = translate(); - clipExtent([[t[0] - k, t[1] - k], [t[0] + k, t[1] + k]]); + /** + * Casts `value` to a path array if it's not one. + * + * @private + * @param {*} value The value to inspect. + * @param {Object} [object] The object to query keys on. + * @returns {Array} Returns the cast property path array. + */ + function castPath(value, object) { + if (isArray(value)) { + return value; } - } else if (clipAuto) { - v = null; + return isKey(value, object) ? [value] : stringToPath(toString(value)); } - return v; - }; - return m.clipExtent(null); -} + /** + * A `baseRest` alias which can be replaced with `identity` by module + * replacement plugins. + * + * @private + * @type {Function} + * @param {Function} func The function to apply a rest parameter to. + * @returns {Function} Returns the new function. + */ + var castRest = baseRest; -(d3.geo.mercator = function() { - return d3_geo_mercatorProjection(d3_geo_mercator); -}).raw = d3_geo_mercator; + /** + * Casts `array` to a slice if it's needed. + * + * @private + * @param {Array} array The array to inspect. + * @param {number} start The start position. + * @param {number} [end=array.length] The end position. + * @returns {Array} Returns the cast slice. + */ + function castSlice(array, start, end) { + var length = array.length; + end = end === undefined ? length : end; + return (!start && end >= length) ? array : baseSlice(array, start, end); + } -function d3_geo_conic(projectAt) { - var φ0 = 0, - φ1 = π / 3, - m = d3_geo_projectionMutator(projectAt), - p = m(φ0, φ1); + /** + * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout). + * + * @private + * @param {number|Object} id The timer id or timeout object of the timer to clear. + */ + var clearTimeout = ctxClearTimeout || function(id) { + return root.clearTimeout(id); + }; - p.parallels = function(_) { - if (!arguments.length) return [φ0 / π * 180, φ1 / π * 180]; - return m(φ0 = _[0] * π / 180, φ1 = _[1] * π / 180); - }; + /** + * Creates a clone of `buffer`. + * + * @private + * @param {Buffer} buffer The buffer to clone. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Buffer} Returns the cloned buffer. + */ + function cloneBuffer(buffer, isDeep) { + if (isDeep) { + return buffer.slice(); + } + var length = buffer.length, + result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length); - return p; -} + buffer.copy(result); + return result; + } -function d3_geo_conicEqualArea(φ0, φ1) { - var sinφ0 = Math.sin(φ0), - n = (sinφ0 + Math.sin(φ1)) / 2, - C = 1 + sinφ0 * (2 * n - sinφ0), - ρ0 = Math.sqrt(C) / n; + /** + * Creates a clone of `arrayBuffer`. + * + * @private + * @param {ArrayBuffer} arrayBuffer The array buffer to clone. + * @returns {ArrayBuffer} Returns the cloned array buffer. + */ + function cloneArrayBuffer(arrayBuffer) { + var result = new arrayBuffer.constructor(arrayBuffer.byteLength); + new Uint8Array(result).set(new Uint8Array(arrayBuffer)); + return result; + } - function forward(λ, φ) { - var ρ = Math.sqrt(C - 2 * n * Math.sin(φ)) / n; - return [ - ρ * Math.sin(λ *= n), - ρ0 - ρ * Math.cos(λ) - ]; - } + /** + * Creates a clone of `dataView`. + * + * @private + * @param {Object} dataView The data view to clone. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the cloned data view. + */ + function cloneDataView(dataView, isDeep) { + var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer; + return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength); + } - forward.invert = function(x, y) { - var ρ0_y = ρ0 - y; - return [ - Math.atan2(x, ρ0_y) / n, - Math.asin((C - (x * x + ρ0_y * ρ0_y) * n * n) / (2 * n)) - ]; - }; + /** + * Creates a clone of `map`. + * + * @private + * @param {Object} map The map to clone. + * @param {Function} cloneFunc The function to clone values. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the cloned map. + */ + function cloneMap(map, isDeep, cloneFunc) { + var array = isDeep ? cloneFunc(mapToArray(map), CLONE_DEEP_FLAG) : mapToArray(map); + return arrayReduce(array, addMapEntry, new map.constructor); + } - return forward; -} + /** + * Creates a clone of `regexp`. + * + * @private + * @param {Object} regexp The regexp to clone. + * @returns {Object} Returns the cloned regexp. + */ + function cloneRegExp(regexp) { + var result = new regexp.constructor(regexp.source, reFlags.exec(regexp)); + result.lastIndex = regexp.lastIndex; + return result; + } -(d3.geo.conicEqualArea = function() { - return d3_geo_conic(d3_geo_conicEqualArea); -}).raw = d3_geo_conicEqualArea; + /** + * Creates a clone of `set`. + * + * @private + * @param {Object} set The set to clone. + * @param {Function} cloneFunc The function to clone values. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the cloned set. + */ + function cloneSet(set, isDeep, cloneFunc) { + var array = isDeep ? cloneFunc(setToArray(set), CLONE_DEEP_FLAG) : setToArray(set); + return arrayReduce(array, addSetEntry, new set.constructor); + } -// A composite projection for the United States, 960×500. The set of standard -// parallels for each region comes from USGS, which is published here: -// http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html#albers -d3.geo.albersUsa = function() { - var lower48 = d3.geo.conicEqualArea() - .rotate([98, 0]) - .center([0, 38]) - .parallels([29.5, 45.5]); - - var alaska = d3.geo.conicEqualArea() - .rotate([160, 0]) - .center([0, 60]) - .parallels([55, 65]); - - var hawaii = d3.geo.conicEqualArea() - .rotate([160, 0]) - .center([0, 20]) - .parallels([8, 18]); - - var puertoRico = d3.geo.conicEqualArea() - .rotate([60, 0]) - .center([0, 10]) - .parallels([8, 18]); - - var alaskaInvert, - hawaiiInvert, - puertoRicoInvert; + /** + * Creates a clone of the `symbol` object. + * + * @private + * @param {Object} symbol The symbol object to clone. + * @returns {Object} Returns the cloned symbol object. + */ + function cloneSymbol(symbol) { + return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {}; + } - function albersUsa(coordinates) { - return projection(coordinates)(coordinates); - } + /** + * Creates a clone of `typedArray`. + * + * @private + * @param {Object} typedArray The typed array to clone. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the cloned typed array. + */ + function cloneTypedArray(typedArray, isDeep) { + var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer; + return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length); + } - function projection(point) { - var lon = point[0], - lat = point[1]; - return lat > 50 ? alaska - : lon < -140 ? hawaii - : lat < 21 ? puertoRico - : lower48; - } + /** + * Compares values to sort them in ascending order. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {number} Returns the sort order indicator for `value`. + */ + function compareAscending(value, other) { + if (value !== other) { + var valIsDefined = value !== undefined, + valIsNull = value === null, + valIsReflexive = value === value, + valIsSymbol = isSymbol(value); + + var othIsDefined = other !== undefined, + othIsNull = other === null, + othIsReflexive = other === other, + othIsSymbol = isSymbol(other); + + if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) || + (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) || + (valIsNull && othIsDefined && othIsReflexive) || + (!valIsDefined && othIsReflexive) || + !valIsReflexive) { + return 1; + } + if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) || + (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) || + (othIsNull && valIsDefined && valIsReflexive) || + (!othIsDefined && valIsReflexive) || + !othIsReflexive) { + return -1; + } + } + return 0; + } - albersUsa.invert = function(coordinates) { - return alaskaInvert(coordinates) || hawaiiInvert(coordinates) || puertoRicoInvert(coordinates) || lower48.invert(coordinates); - }; + /** + * Used by `_.orderBy` to compare multiple properties of a value to another + * and stable sort them. + * + * If `orders` is unspecified, all values are sorted in ascending order. Otherwise, + * specify an order of "desc" for descending or "asc" for ascending sort order + * of corresponding values. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {boolean[]|string[]} orders The order to sort by for each property. + * @returns {number} Returns the sort order indicator for `object`. + */ + function compareMultiple(object, other, orders) { + var index = -1, + objCriteria = object.criteria, + othCriteria = other.criteria, + length = objCriteria.length, + ordersLength = orders.length; - albersUsa.scale = function(x) { - if (!arguments.length) return lower48.scale(); - lower48.scale(x); - alaska.scale(x * .6); - hawaii.scale(x); - puertoRico.scale(x * 1.5); - return albersUsa.translate(lower48.translate()); - }; + while (++index < length) { + var result = compareAscending(objCriteria[index], othCriteria[index]); + if (result) { + if (index >= ordersLength) { + return result; + } + var order = orders[index]; + return result * (order == 'desc' ? -1 : 1); + } + } + // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications + // that causes it, under certain circumstances, to provide the same value for + // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247 + // for more details. + // + // This also ensures a stable sort in V8 and other engines. + // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details. + return object.index - other.index; + } - albersUsa.translate = function(x) { - if (!arguments.length) return lower48.translate(); - var dz = lower48.scale(), - dx = x[0], - dy = x[1]; - lower48.translate(x); - alaska.translate([dx - .40 * dz, dy + .17 * dz]); - hawaii.translate([dx - .19 * dz, dy + .20 * dz]); - puertoRico.translate([dx + .58 * dz, dy + .43 * dz]); - - alaskaInvert = d3_geo_albersUsaInvert(alaska, [[-180, 50], [-130, 72]]); - hawaiiInvert = d3_geo_albersUsaInvert(hawaii, [[-164, 18], [-154, 24]]); - puertoRicoInvert = d3_geo_albersUsaInvert(puertoRico, [[-67.5, 17.5], [-65, 19]]); + /** + * Creates an array that is the composition of partially applied arguments, + * placeholders, and provided arguments into a single array of arguments. + * + * @private + * @param {Array} args The provided arguments. + * @param {Array} partials The arguments to prepend to those provided. + * @param {Array} holders The `partials` placeholder indexes. + * @params {boolean} [isCurried] Specify composing for a curried function. + * @returns {Array} Returns the new array of composed arguments. + */ + function composeArgs(args, partials, holders, isCurried) { + var argsIndex = -1, + argsLength = args.length, + holdersLength = holders.length, + leftIndex = -1, + leftLength = partials.length, + rangeLength = nativeMax(argsLength - holdersLength, 0), + result = Array(leftLength + rangeLength), + isUncurried = !isCurried; + + while (++leftIndex < leftLength) { + result[leftIndex] = partials[leftIndex]; + } + while (++argsIndex < holdersLength) { + if (isUncurried || argsIndex < argsLength) { + result[holders[argsIndex]] = args[argsIndex]; + } + } + while (rangeLength--) { + result[leftIndex++] = args[argsIndex++]; + } + return result; + } - return albersUsa; - }; + /** + * This function is like `composeArgs` except that the arguments composition + * is tailored for `_.partialRight`. + * + * @private + * @param {Array} args The provided arguments. + * @param {Array} partials The arguments to append to those provided. + * @param {Array} holders The `partials` placeholder indexes. + * @params {boolean} [isCurried] Specify composing for a curried function. + * @returns {Array} Returns the new array of composed arguments. + */ + function composeArgsRight(args, partials, holders, isCurried) { + var argsIndex = -1, + argsLength = args.length, + holdersIndex = -1, + holdersLength = holders.length, + rightIndex = -1, + rightLength = partials.length, + rangeLength = nativeMax(argsLength - holdersLength, 0), + result = Array(rangeLength + rightLength), + isUncurried = !isCurried; + + while (++argsIndex < rangeLength) { + result[argsIndex] = args[argsIndex]; + } + var offset = argsIndex; + while (++rightIndex < rightLength) { + result[offset + rightIndex] = partials[rightIndex]; + } + while (++holdersIndex < holdersLength) { + if (isUncurried || argsIndex < argsLength) { + result[offset + holders[holdersIndex]] = args[argsIndex++]; + } + } + return result; + } - return albersUsa.scale(1000); -}; + /** + * Copies the values of `source` to `array`. + * + * @private + * @param {Array} source The array to copy values from. + * @param {Array} [array=[]] The array to copy values to. + * @returns {Array} Returns `array`. + */ + function copyArray(source, array) { + var index = -1, + length = source.length; -function d3_geo_albersUsaInvert(projection, extent) { - var a = projection(extent[0]), - b = projection([.5 * (extent[0][0] + extent[1][0]), extent[0][1]]), - c = projection([extent[1][0], extent[0][1]]), - d = projection(extent[1]); - - var dya = b[1]- a[1], - dxa = b[0]- a[0], - dyb = c[1]- b[1], - dxb = c[0]- b[0]; - - var ma = dya / dxa, - mb = dyb / dxb; - - // Find center of circle going through points [a, b, c]. - var cx = .5 * (ma * mb * (a[1] - c[1]) + mb * (a[0] + b[0]) - ma * (b[0] + c[0])) / (mb - ma), - cy = (.5 * (a[0] + b[0]) - cx) / ma + .5 * (a[1] + b[1]); - - // Radial distance² from center. - var dx0 = d[0] - cx, - dy0 = d[1] - cy, - dx1 = a[0] - cx, - dy1 = a[1] - cy, - r0 = dx0 * dx0 + dy0 * dy0, - r1 = dx1 * dx1 + dy1 * dy1; - - // Angular extent. - var a0 = Math.atan2(dy0, dx0), - a1 = Math.atan2(dy1, dx1); - - return function(coordinates) { - var dx = coordinates[0] - cx, - dy = coordinates[1] - cy, - r = dx * dx + dy * dy, - a = Math.atan2(dy, dx); - if (r0 < r && r < r1 && a0 < a && a < a1) return projection.invert(coordinates); - }; -} + array || (array = Array(length)); + while (++index < length) { + array[index] = source[index]; + } + return array; + } -d3.geo.area = function(object) { - d3_geo_areaSum = 0; - d3.geo.stream(object, d3_geo_area); - return d3_geo_areaSum; -}; + /** + * Copies properties of `source` to `object`. + * + * @private + * @param {Object} source The object to copy properties from. + * @param {Array} props The property identifiers to copy. + * @param {Object} [object={}] The object to copy properties to. + * @param {Function} [customizer] The function to customize copied values. + * @returns {Object} Returns `object`. + */ + function copyObject(source, props, object, customizer) { + var isNew = !object; + object || (object = {}); -var d3_geo_areaSum, - d3_geo_areaRingU, - d3_geo_areaRingV; + var index = -1, + length = props.length; -var d3_geo_area = { - sphere: function() { d3_geo_areaSum += 4 * π; }, - point: d3_noop, - lineStart: d3_noop, - lineEnd: d3_noop, - - // Only count area for polygon rings. - polygonStart: function() { - d3_geo_areaRingU = 1, d3_geo_areaRingV = 0; - d3_geo_area.lineStart = d3_geo_areaRingStart; - }, - polygonEnd: function() { - var area = 2 * Math.atan2(d3_geo_areaRingV, d3_geo_areaRingU); - d3_geo_areaSum += area < 0 ? 4 * π + area : area; - d3_geo_area.lineStart = d3_geo_area.lineEnd = d3_geo_area.point = d3_noop; - } -}; - -function d3_geo_areaRingStart() { - var λ00, φ00, λ0, cosφ0, sinφ0; // start point and two previous points + while (++index < length) { + var key = props[index]; - // For the first point, … - d3_geo_area.point = function(λ, φ) { - d3_geo_area.point = nextPoint; - λ0 = (λ00 = λ) * d3_radians, cosφ0 = Math.cos(φ = (φ00 = φ) * d3_radians / 2 + π / 4), sinφ0 = Math.sin(φ); - }; + var newValue = customizer + ? customizer(object[key], source[key], key, object, source) + : undefined; - // For subsequent points, … - function nextPoint(λ, φ) { - λ *= d3_radians; - φ = φ * d3_radians / 2 + π / 4; // half the angular distance from south pole - - // Spherical excess E for a spherical triangle with vertices: south pole, - // previous point, current point. Uses a formula derived from Cagnoli’s - // theorem. See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2). - var dλ = λ - λ0, - cosφ = Math.cos(φ), - sinφ = Math.sin(φ), - k = sinφ0 * sinφ, - u0 = d3_geo_areaRingU, - v0 = d3_geo_areaRingV, - u = cosφ0 * cosφ + k * Math.cos(dλ), - v = k * Math.sin(dλ); - // ∑ arg(z) = arg(∏ z), where z = u + iv. - d3_geo_areaRingU = u0 * u - v0 * v; - d3_geo_areaRingV = v0 * u + u0 * v; - - // Advance the previous points. - λ0 = λ, cosφ0 = cosφ, sinφ0 = sinφ; - } - - // For the last point, return to the start. - d3_geo_area.lineEnd = function() { - nextPoint(λ00, φ00); - }; -} + if (newValue === undefined) { + newValue = source[key]; + } + if (isNew) { + baseAssignValue(object, key, newValue); + } else { + assignValue(object, key, newValue); + } + } + return object; + } -d3.geo.bounds = d3_geo_bounds(d3_identity); + /** + * Copies own symbols of `source` to `object`. + * + * @private + * @param {Object} source The object to copy symbols from. + * @param {Object} [object={}] The object to copy symbols to. + * @returns {Object} Returns `object`. + */ + function copySymbols(source, object) { + return copyObject(source, getSymbols(source), object); + } -function d3_geo_bounds(projectStream) { - var x0, y0, x1, y1; + /** + * Copies own and inherited symbols of `source` to `object`. + * + * @private + * @param {Object} source The object to copy symbols from. + * @param {Object} [object={}] The object to copy symbols to. + * @returns {Object} Returns `object`. + */ + function copySymbolsIn(source, object) { + return copyObject(source, getSymbolsIn(source), object); + } - var bound = { - point: boundPoint, - lineStart: d3_noop, - lineEnd: d3_noop, + /** + * Creates a function like `_.groupBy`. + * + * @private + * @param {Function} setter The function to set accumulator values. + * @param {Function} [initializer] The accumulator object initializer. + * @returns {Function} Returns the new aggregator function. + */ + function createAggregator(setter, initializer) { + return function(collection, iteratee) { + var func = isArray(collection) ? arrayAggregator : baseAggregator, + accumulator = initializer ? initializer() : {}; - // While inside a polygon, ignore points in holes. - polygonStart: function() { bound.lineEnd = boundPolygonLineEnd; }, - polygonEnd: function() { bound.point = boundPoint; } - }; + return func(collection, setter, getIteratee(iteratee, 2), accumulator); + }; + } - function boundPoint(x, y) { - if (x < x0) x0 = x; - if (x > x1) x1 = x; - if (y < y0) y0 = y; - if (y > y1) y1 = y; - } + /** + * Creates a function like `_.assign`. + * + * @private + * @param {Function} assigner The function to assign values. + * @returns {Function} Returns the new assigner function. + */ + function createAssigner(assigner) { + return baseRest(function(object, sources) { + var index = -1, + length = sources.length, + customizer = length > 1 ? sources[length - 1] : undefined, + guard = length > 2 ? sources[2] : undefined; + + customizer = (assigner.length > 3 && typeof customizer == 'function') + ? (length--, customizer) + : undefined; + + if (guard && isIterateeCall(sources[0], sources[1], guard)) { + customizer = length < 3 ? undefined : customizer; + length = 1; + } + object = Object(object); + while (++index < length) { + var source = sources[index]; + if (source) { + assigner(object, source, index, customizer); + } + } + return object; + }); + } - function boundPolygonLineEnd() { - bound.point = bound.lineEnd = d3_noop; - } + /** + * Creates a `baseEach` or `baseEachRight` function. + * + * @private + * @param {Function} eachFunc The function to iterate over a collection. + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Function} Returns the new base function. + */ + function createBaseEach(eachFunc, fromRight) { + return function(collection, iteratee) { + if (collection == null) { + return collection; + } + if (!isArrayLike(collection)) { + return eachFunc(collection, iteratee); + } + var length = collection.length, + index = fromRight ? length : -1, + iterable = Object(collection); - return function(feature) { - y1 = x1 = -(x0 = y0 = Infinity); - d3.geo.stream(feature, projectStream(bound)); - return [[x0, y0], [x1, y1]]; - }; -} + while ((fromRight ? index-- : ++index < length)) { + if (iteratee(iterable[index], index, iterable) === false) { + break; + } + } + return collection; + }; + } -d3.geo.centroid = function(object) { - d3_geo_centroidDimension = d3_geo_centroidW = d3_geo_centroidX = d3_geo_centroidY = d3_geo_centroidZ = 0; - d3.geo.stream(object, d3_geo_centroid); - var m; - if (d3_geo_centroidW && - Math.abs(m = Math.sqrt(d3_geo_centroidX * d3_geo_centroidX + d3_geo_centroidY * d3_geo_centroidY + d3_geo_centroidZ * d3_geo_centroidZ)) > ε) { - return [ - Math.atan2(d3_geo_centroidY, d3_geo_centroidX) * d3_degrees, - Math.asin(Math.max(-1, Math.min(1, d3_geo_centroidZ / m))) * d3_degrees - ]; - } -}; + /** + * Creates a base function for methods like `_.forIn` and `_.forOwn`. + * + * @private + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Function} Returns the new base function. + */ + function createBaseFor(fromRight) { + return function(object, iteratee, keysFunc) { + var index = -1, + iterable = Object(object), + props = keysFunc(object), + length = props.length; + + while (length--) { + var key = props[fromRight ? length : ++index]; + if (iteratee(iterable[key], key, iterable) === false) { + break; + } + } + return object; + }; + } -var d3_geo_centroidDimension, - d3_geo_centroidW, - d3_geo_centroidX, - d3_geo_centroidY, - d3_geo_centroidZ; + /** + * Creates a function that wraps `func` to invoke it with the optional `this` + * binding of `thisArg`. + * + * @private + * @param {Function} func The function to wrap. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @param {*} [thisArg] The `this` binding of `func`. + * @returns {Function} Returns the new wrapped function. + */ + function createBind(func, bitmask, thisArg) { + var isBind = bitmask & WRAP_BIND_FLAG, + Ctor = createCtor(func); -var d3_geo_centroid = { - sphere: function() { - if (d3_geo_centroidDimension < 2) { - d3_geo_centroidDimension = 2; - d3_geo_centroidW = d3_geo_centroidX = d3_geo_centroidY = d3_geo_centroidZ = 0; - } - }, - point: d3_geo_centroidPoint, - lineStart: d3_geo_centroidLineStart, - lineEnd: d3_geo_centroidLineEnd, - polygonStart: function() { - if (d3_geo_centroidDimension < 2) { - d3_geo_centroidDimension = 2; - d3_geo_centroidW = d3_geo_centroidX = d3_geo_centroidY = d3_geo_centroidZ = 0; + function wrapper() { + var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func; + return fn.apply(isBind ? thisArg : this, arguments); + } + return wrapper; } - d3_geo_centroid.lineStart = d3_geo_centroidRingStart; - }, - polygonEnd: function() { - d3_geo_centroid.lineStart = d3_geo_centroidLineStart; - } -}; - -// Arithmetic mean of Cartesian vectors. -function d3_geo_centroidPoint(λ, φ) { - if (d3_geo_centroidDimension) return; - ++d3_geo_centroidW; - λ *= d3_radians; - var cosφ = Math.cos(φ *= d3_radians); - d3_geo_centroidX += (cosφ * Math.cos(λ) - d3_geo_centroidX) / d3_geo_centroidW; - d3_geo_centroidY += (cosφ * Math.sin(λ) - d3_geo_centroidY) / d3_geo_centroidW; - d3_geo_centroidZ += (Math.sin(φ) - d3_geo_centroidZ) / d3_geo_centroidW; -} - -function d3_geo_centroidRingStart() { - var λ00, φ00; // first point - - d3_geo_centroidDimension = 1; - d3_geo_centroidLineStart(); - d3_geo_centroidDimension = 2; - - var linePoint = d3_geo_centroid.point; - d3_geo_centroid.point = function(λ, φ) { - linePoint(λ00 = λ, φ00 = φ); - }; - d3_geo_centroid.lineEnd = function() { - d3_geo_centroid.point(λ00, φ00); - d3_geo_centroidLineEnd(); - d3_geo_centroid.lineEnd = d3_geo_centroidLineEnd; - }; -} -function d3_geo_centroidLineStart() { - var x0, y0, z0; // previous point + /** + * Creates a function like `_.lowerFirst`. + * + * @private + * @param {string} methodName The name of the `String` case method to use. + * @returns {Function} Returns the new case function. + */ + function createCaseFirst(methodName) { + return function(string) { + string = toString(string); - if (d3_geo_centroidDimension > 1) return; - if (d3_geo_centroidDimension < 1) { - d3_geo_centroidDimension = 1; - d3_geo_centroidW = d3_geo_centroidX = d3_geo_centroidY = d3_geo_centroidZ = 0; - } + var strSymbols = hasUnicode(string) + ? stringToArray(string) + : undefined; - d3_geo_centroid.point = function(λ, φ) { - λ *= d3_radians; - var cosφ = Math.cos(φ *= d3_radians); - x0 = cosφ * Math.cos(λ); - y0 = cosφ * Math.sin(λ); - z0 = Math.sin(φ); - d3_geo_centroid.point = nextPoint; - }; + var chr = strSymbols + ? strSymbols[0] + : string.charAt(0); - function nextPoint(λ, φ) { - λ *= d3_radians; - var cosφ = Math.cos(φ *= d3_radians), - x = cosφ * Math.cos(λ), - y = cosφ * Math.sin(λ), - z = Math.sin(φ), - w = Math.atan2( - Math.sqrt((w = y0 * z - z0 * y) * w + (w = z0 * x - x0 * z) * w + (w = x0 * y - y0 * x) * w), - x0 * x + y0 * y + z0 * z); - d3_geo_centroidW += w; - d3_geo_centroidX += w * (x0 + (x0 = x)); - d3_geo_centroidY += w * (y0 + (y0 = y)); - d3_geo_centroidZ += w * (z0 + (z0 = z)); - } -} + var trailing = strSymbols + ? castSlice(strSymbols, 1).join('') + : string.slice(1); -function d3_geo_centroidLineEnd() { - d3_geo_centroid.point = d3_geo_centroidPoint; -} + return chr[methodName]() + trailing; + }; + } -// TODO Unify this code with d3.geom.polygon area? + /** + * Creates a function like `_.camelCase`. + * + * @private + * @param {Function} callback The function to combine each word. + * @returns {Function} Returns the new compounder function. + */ + function createCompounder(callback) { + return function(string) { + return arrayReduce(words(deburr(string).replace(reApos, '')), callback, ''); + }; + } -var d3_geo_pathAreaSum, d3_geo_pathAreaPolygon, d3_geo_pathArea = { - point: d3_noop, - lineStart: d3_noop, - lineEnd: d3_noop, + /** + * Creates a function that produces an instance of `Ctor` regardless of + * whether it was invoked as part of a `new` expression or by `call` or `apply`. + * + * @private + * @param {Function} Ctor The constructor to wrap. + * @returns {Function} Returns the new wrapped function. + */ + function createCtor(Ctor) { + return function() { + // Use a `switch` statement to work with class constructors. See + // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist + // for more details. + var args = arguments; + switch (args.length) { + case 0: return new Ctor; + case 1: return new Ctor(args[0]); + case 2: return new Ctor(args[0], args[1]); + case 3: return new Ctor(args[0], args[1], args[2]); + case 4: return new Ctor(args[0], args[1], args[2], args[3]); + case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]); + case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]); + case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]); + } + var thisBinding = baseCreate(Ctor.prototype), + result = Ctor.apply(thisBinding, args); - // Only count area for polygon rings. - polygonStart: function() { - d3_geo_pathAreaPolygon = 0; - d3_geo_pathArea.lineStart = d3_geo_pathAreaRingStart; - }, - polygonEnd: function() { - d3_geo_pathArea.lineStart = d3_geo_pathArea.lineEnd = d3_geo_pathArea.point = d3_noop; - d3_geo_pathAreaSum += Math.abs(d3_geo_pathAreaPolygon / 2); - } -}; + // Mimic the constructor's `return` behavior. + // See https://es5.github.io/#x13.2.2 for more details. + return isObject(result) ? result : thisBinding; + }; + } -function d3_geo_pathAreaRingStart() { - var x00, y00, x0, y0; + /** + * Creates a function that wraps `func` to enable currying. + * + * @private + * @param {Function} func The function to wrap. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @param {number} arity The arity of `func`. + * @returns {Function} Returns the new wrapped function. + */ + function createCurry(func, bitmask, arity) { + var Ctor = createCtor(func); - // For the first point, … - d3_geo_pathArea.point = function(x, y) { - d3_geo_pathArea.point = nextPoint; - x00 = x0 = x, y00 = y0 = y; - }; + function wrapper() { + var length = arguments.length, + args = Array(length), + index = length, + placeholder = getHolder(wrapper); - // For subsequent points, … - function nextPoint(x, y) { - d3_geo_pathAreaPolygon += y0 * x - x0 * y; - x0 = x, y0 = y; - } + while (index--) { + args[index] = arguments[index]; + } + var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder) + ? [] + : replaceHolders(args, placeholder); + + length -= holders.length; + if (length < arity) { + return createRecurry( + func, bitmask, createHybrid, wrapper.placeholder, undefined, + args, holders, undefined, undefined, arity - length); + } + var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func; + return apply(fn, this, args); + } + return wrapper; + } - // For the last point, return to the start. - d3_geo_pathArea.lineEnd = function() { - nextPoint(x00, y00); - }; -} -function d3_geo_pathBuffer() { - var pointCircle = d3_geo_pathCircle(4.5), - buffer = []; + /** + * Creates a `_.find` or `_.findLast` function. + * + * @private + * @param {Function} findIndexFunc The function to find the collection index. + * @returns {Function} Returns the new find function. + */ + function createFind(findIndexFunc) { + return function(collection, predicate, fromIndex) { + var iterable = Object(collection); + if (!isArrayLike(collection)) { + var iteratee = getIteratee(predicate, 3); + collection = keys(collection); + predicate = function(key) { return iteratee(iterable[key], key, iterable); }; + } + var index = findIndexFunc(collection, predicate, fromIndex); + return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined; + }; + } - var stream = { - point: point, + /** + * Creates a `_.flow` or `_.flowRight` function. + * + * @private + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Function} Returns the new flow function. + */ + function createFlow(fromRight) { + return flatRest(function(funcs) { + var length = funcs.length, + index = length, + prereq = LodashWrapper.prototype.thru; + + if (fromRight) { + funcs.reverse(); + } + while (index--) { + var func = funcs[index]; + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + if (prereq && !wrapper && getFuncName(func) == 'wrapper') { + var wrapper = new LodashWrapper([], true); + } + } + index = wrapper ? index : length; + while (++index < length) { + func = funcs[index]; + + var funcName = getFuncName(func), + data = funcName == 'wrapper' ? getData(func) : undefined; + + if (data && isLaziable(data[0]) && + data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) && + !data[4].length && data[9] == 1 + ) { + wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]); + } else { + wrapper = (func.length == 1 && isLaziable(func)) + ? wrapper[funcName]() + : wrapper.thru(func); + } + } + return function() { + var args = arguments, + value = args[0]; - // While inside a line, override point to moveTo then lineTo. - lineStart: function() { stream.point = pointLineStart; }, - lineEnd: lineEnd, + if (wrapper && args.length == 1 && isArray(value)) { + return wrapper.plant(value).value(); + } + var index = 0, + result = length ? funcs[index].apply(this, args) : value; - // While inside a polygon, override lineEnd to closePath. - polygonStart: function() { stream.lineEnd = lineEndPolygon; }, - polygonEnd: function() { stream.lineEnd = lineEnd; stream.point = point; }, + while (++index < length) { + result = funcs[index].call(this, result); + } + return result; + }; + }); + } - pointRadius: function(_) { - pointCircle = d3_geo_pathCircle(_); - return stream; - }, + /** + * Creates a function that wraps `func` to invoke it with optional `this` + * binding of `thisArg`, partial application, and currying. + * + * @private + * @param {Function|string} func The function or method name to wrap. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @param {*} [thisArg] The `this` binding of `func`. + * @param {Array} [partials] The arguments to prepend to those provided to + * the new function. + * @param {Array} [holders] The `partials` placeholder indexes. + * @param {Array} [partialsRight] The arguments to append to those provided + * to the new function. + * @param {Array} [holdersRight] The `partialsRight` placeholder indexes. + * @param {Array} [argPos] The argument positions of the new function. + * @param {number} [ary] The arity cap of `func`. + * @param {number} [arity] The arity of `func`. + * @returns {Function} Returns the new wrapped function. + */ + function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) { + var isAry = bitmask & WRAP_ARY_FLAG, + isBind = bitmask & WRAP_BIND_FLAG, + isBindKey = bitmask & WRAP_BIND_KEY_FLAG, + isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG), + isFlip = bitmask & WRAP_FLIP_FLAG, + Ctor = isBindKey ? undefined : createCtor(func); + + function wrapper() { + var length = arguments.length, + args = Array(length), + index = length; + + while (index--) { + args[index] = arguments[index]; + } + if (isCurried) { + var placeholder = getHolder(wrapper), + holdersCount = countHolders(args, placeholder); + } + if (partials) { + args = composeArgs(args, partials, holders, isCurried); + } + if (partialsRight) { + args = composeArgsRight(args, partialsRight, holdersRight, isCurried); + } + length -= holdersCount; + if (isCurried && length < arity) { + var newHolders = replaceHolders(args, placeholder); + return createRecurry( + func, bitmask, createHybrid, wrapper.placeholder, thisArg, + args, newHolders, argPos, ary, arity - length + ); + } + var thisBinding = isBind ? thisArg : this, + fn = isBindKey ? thisBinding[func] : func; - result: function() { - if (buffer.length) { - var result = buffer.join(""); - buffer = []; - return result; + length = args.length; + if (argPos) { + args = reorder(args, argPos); + } else if (isFlip && length > 1) { + args.reverse(); + } + if (isAry && ary < length) { + args.length = ary; + } + if (this && this !== root && this instanceof wrapper) { + fn = Ctor || createCtor(fn); + } + return fn.apply(thisBinding, args); } + return wrapper; } - }; - function point(x, y) { - buffer.push("M", x, ",", y, pointCircle); - } + /** + * Creates a function like `_.invertBy`. + * + * @private + * @param {Function} setter The function to set accumulator values. + * @param {Function} toIteratee The function to resolve iteratees. + * @returns {Function} Returns the new inverter function. + */ + function createInverter(setter, toIteratee) { + return function(object, iteratee) { + return baseInverter(object, setter, toIteratee(iteratee), {}); + }; + } - function pointLineStart(x, y) { - buffer.push("M", x, ",", y); - stream.point = pointLine; - } + /** + * Creates a function that performs a mathematical operation on two values. + * + * @private + * @param {Function} operator The function to perform the operation. + * @param {number} [defaultValue] The value used for `undefined` arguments. + * @returns {Function} Returns the new mathematical operation function. + */ + function createMathOperation(operator, defaultValue) { + return function(value, other) { + var result; + if (value === undefined && other === undefined) { + return defaultValue; + } + if (value !== undefined) { + result = value; + } + if (other !== undefined) { + if (result === undefined) { + return other; + } + if (typeof value == 'string' || typeof other == 'string') { + value = baseToString(value); + other = baseToString(other); + } else { + value = baseToNumber(value); + other = baseToNumber(other); + } + result = operator(value, other); + } + return result; + }; + } - function pointLine(x, y) { - buffer.push("L", x, ",", y); - } + /** + * Creates a function like `_.over`. + * + * @private + * @param {Function} arrayFunc The function to iterate over iteratees. + * @returns {Function} Returns the new over function. + */ + function createOver(arrayFunc) { + return flatRest(function(iteratees) { + iteratees = arrayMap(iteratees, baseUnary(getIteratee())); + return baseRest(function(args) { + var thisArg = this; + return arrayFunc(iteratees, function(iteratee) { + return apply(iteratee, thisArg, args); + }); + }); + }); + } - function lineEnd() { - stream.point = point; - } + /** + * Creates the padding for `string` based on `length`. The `chars` string + * is truncated if the number of characters exceeds `length`. + * + * @private + * @param {number} length The padding length. + * @param {string} [chars=' '] The string used as padding. + * @returns {string} Returns the padding for `string`. + */ + function createPadding(length, chars) { + chars = chars === undefined ? ' ' : baseToString(chars); - function lineEndPolygon() { - buffer.push("Z"); - } + var charsLength = chars.length; + if (charsLength < 2) { + return charsLength ? baseRepeat(chars, length) : chars; + } + var result = baseRepeat(chars, nativeCeil(length / stringSize(chars))); + return hasUnicode(chars) + ? castSlice(stringToArray(result), 0, length).join('') + : result.slice(0, length); + } - return stream; -} + /** + * Creates a function that wraps `func` to invoke it with the `this` binding + * of `thisArg` and `partials` prepended to the arguments it receives. + * + * @private + * @param {Function} func The function to wrap. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @param {*} thisArg The `this` binding of `func`. + * @param {Array} partials The arguments to prepend to those provided to + * the new function. + * @returns {Function} Returns the new wrapped function. + */ + function createPartial(func, bitmask, thisArg, partials) { + var isBind = bitmask & WRAP_BIND_FLAG, + Ctor = createCtor(func); + + function wrapper() { + var argsIndex = -1, + argsLength = arguments.length, + leftIndex = -1, + leftLength = partials.length, + args = Array(leftLength + argsLength), + fn = (this && this !== root && this instanceof wrapper) ? Ctor : func; + + while (++leftIndex < leftLength) { + args[leftIndex] = partials[leftIndex]; + } + while (argsLength--) { + args[leftIndex++] = arguments[++argsIndex]; + } + return apply(fn, isBind ? thisArg : this, args); + } + return wrapper; + } -// TODO Unify this code with d3.geom.polygon centroid? -// TODO Enforce positive area for exterior, negative area for interior? + /** + * Creates a `_.range` or `_.rangeRight` function. + * + * @private + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Function} Returns the new range function. + */ + function createRange(fromRight) { + return function(start, end, step) { + if (step && typeof step != 'number' && isIterateeCall(start, end, step)) { + end = step = undefined; + } + // Ensure the sign of `-0` is preserved. + start = toFinite(start); + if (end === undefined) { + end = start; + start = 0; + } else { + end = toFinite(end); + } + step = step === undefined ? (start < end ? 1 : -1) : toFinite(step); + return baseRange(start, end, step, fromRight); + }; + } -var d3_geo_pathCentroid = { - point: d3_geo_pathCentroidPoint, + /** + * Creates a function that performs a relational operation on two values. + * + * @private + * @param {Function} operator The function to perform the operation. + * @returns {Function} Returns the new relational operation function. + */ + function createRelationalOperation(operator) { + return function(value, other) { + if (!(typeof value == 'string' && typeof other == 'string')) { + value = toNumber(value); + other = toNumber(other); + } + return operator(value, other); + }; + } - // For lines, weight by length. - lineStart: d3_geo_pathCentroidLineStart, - lineEnd: d3_geo_pathCentroidLineEnd, + /** + * Creates a function that wraps `func` to continue currying. + * + * @private + * @param {Function} func The function to wrap. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @param {Function} wrapFunc The function to create the `func` wrapper. + * @param {*} placeholder The placeholder value. + * @param {*} [thisArg] The `this` binding of `func`. + * @param {Array} [partials] The arguments to prepend to those provided to + * the new function. + * @param {Array} [holders] The `partials` placeholder indexes. + * @param {Array} [argPos] The argument positions of the new function. + * @param {number} [ary] The arity cap of `func`. + * @param {number} [arity] The arity of `func`. + * @returns {Function} Returns the new wrapped function. + */ + function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) { + var isCurry = bitmask & WRAP_CURRY_FLAG, + newHolders = isCurry ? holders : undefined, + newHoldersRight = isCurry ? undefined : holders, + newPartials = isCurry ? partials : undefined, + newPartialsRight = isCurry ? undefined : partials; + + bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG); + bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG); + + if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) { + bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG); + } + var newData = [ + func, bitmask, thisArg, newPartials, newHolders, newPartialsRight, + newHoldersRight, argPos, ary, arity + ]; + + var result = wrapFunc.apply(undefined, newData); + if (isLaziable(func)) { + setData(result, newData); + } + result.placeholder = placeholder; + return setWrapToString(result, func, bitmask); + } - // For polygons, weight by area. - polygonStart: function() { - d3_geo_pathCentroid.lineStart = d3_geo_pathCentroidRingStart; - }, - polygonEnd: function() { - d3_geo_pathCentroid.point = d3_geo_pathCentroidPoint; - d3_geo_pathCentroid.lineStart = d3_geo_pathCentroidLineStart; - d3_geo_pathCentroid.lineEnd = d3_geo_pathCentroidLineEnd; - } -}; + /** + * Creates a function like `_.round`. + * + * @private + * @param {string} methodName The name of the `Math` method to use when rounding. + * @returns {Function} Returns the new round function. + */ + function createRound(methodName) { + var func = Math[methodName]; + return function(number, precision) { + number = toNumber(number); + precision = precision == null ? 0 : nativeMin(toInteger(precision), 292); + if (precision) { + // Shift with exponential notation to avoid floating-point issues. + // See [MDN](https://mdn.io/round#Examples) for more details. + var pair = (toString(number) + 'e').split('e'), + value = func(pair[0] + 'e' + (+pair[1] + precision)); + + pair = (toString(value) + 'e').split('e'); + return +(pair[0] + 'e' + (+pair[1] - precision)); + } + return func(number); + }; + } -function d3_geo_pathCentroidPoint(x, y) { - if (d3_geo_centroidDimension) return; - d3_geo_centroidX += x; - d3_geo_centroidY += y; - ++d3_geo_centroidZ; -} + /** + * Creates a set object of `values`. + * + * @private + * @param {Array} values The values to add to the set. + * @returns {Object} Returns the new set. + */ + var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) { + return new Set(values); + }; -function d3_geo_pathCentroidLineStart() { - var x0, y0; + /** + * Creates a `_.toPairs` or `_.toPairsIn` function. + * + * @private + * @param {Function} keysFunc The function to get the keys of a given object. + * @returns {Function} Returns the new pairs function. + */ + function createToPairs(keysFunc) { + return function(object) { + var tag = getTag(object); + if (tag == mapTag) { + return mapToArray(object); + } + if (tag == setTag) { + return setToPairs(object); + } + return baseToPairs(object, keysFunc(object)); + }; + } - if (d3_geo_centroidDimension !== 1) { - if (d3_geo_centroidDimension < 1) { - d3_geo_centroidDimension = 1; - d3_geo_centroidX = d3_geo_centroidY = d3_geo_centroidZ = 0; - } else return; - } + /** + * Creates a function that either curries or invokes `func` with optional + * `this` binding and partially applied arguments. + * + * @private + * @param {Function|string} func The function or method name to wrap. + * @param {number} bitmask The bitmask flags. + * 1 - `_.bind` + * 2 - `_.bindKey` + * 4 - `_.curry` or `_.curryRight` of a bound function + * 8 - `_.curry` + * 16 - `_.curryRight` + * 32 - `_.partial` + * 64 - `_.partialRight` + * 128 - `_.rearg` + * 256 - `_.ary` + * 512 - `_.flip` + * @param {*} [thisArg] The `this` binding of `func`. + * @param {Array} [partials] The arguments to be partially applied. + * @param {Array} [holders] The `partials` placeholder indexes. + * @param {Array} [argPos] The argument positions of the new function. + * @param {number} [ary] The arity cap of `func`. + * @param {number} [arity] The arity of `func`. + * @returns {Function} Returns the new wrapped function. + */ + function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) { + var isBindKey = bitmask & WRAP_BIND_KEY_FLAG; + if (!isBindKey && typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + var length = partials ? partials.length : 0; + if (!length) { + bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG); + partials = holders = undefined; + } + ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0); + arity = arity === undefined ? arity : toInteger(arity); + length -= holders ? holders.length : 0; - d3_geo_pathCentroid.point = function(x, y) { - d3_geo_pathCentroid.point = nextPoint; - x0 = x, y0 = y; - }; - - function nextPoint(x, y) { - var dx = x - x0, dy = y - y0, z = Math.sqrt(dx * dx + dy * dy); - d3_geo_centroidX += z * (x0 + x) / 2; - d3_geo_centroidY += z * (y0 + y) / 2; - d3_geo_centroidZ += z; - x0 = x, y0 = y; - } -} - -function d3_geo_pathCentroidLineEnd() { - d3_geo_pathCentroid.point = d3_geo_pathCentroidPoint; -} - -function d3_geo_pathCentroidRingStart() { - var x00, y00, x0, y0; - - if (d3_geo_centroidDimension < 2) { - d3_geo_centroidDimension = 2; - d3_geo_centroidX = d3_geo_centroidY = d3_geo_centroidZ = 0; - } + if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) { + var partialsRight = partials, + holdersRight = holders; - // For the first point, … - d3_geo_pathCentroid.point = function(x, y) { - d3_geo_pathCentroid.point = nextPoint; - x00 = x0 = x, y00 = y0 = y; - }; + partials = holders = undefined; + } + var data = isBindKey ? undefined : getData(func); - // For subsequent points, … - function nextPoint(x, y) { - var z = y0 * x - x0 * y; - d3_geo_centroidX += z * (x0 + x); - d3_geo_centroidY += z * (y0 + y); - d3_geo_centroidZ += z * 3; - x0 = x, y0 = y; - } + var newData = [ + func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, + argPos, ary, arity + ]; - // For the last point, return to the start. - d3_geo_pathCentroid.lineEnd = function() { - nextPoint(x00, y00); - }; -} + if (data) { + mergeData(newData, data); + } + func = newData[0]; + bitmask = newData[1]; + thisArg = newData[2]; + partials = newData[3]; + holders = newData[4]; + arity = newData[9] = newData[9] === undefined + ? (isBindKey ? 0 : func.length) + : nativeMax(newData[9] - length, 0); + + if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) { + bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG); + } + if (!bitmask || bitmask == WRAP_BIND_FLAG) { + var result = createBind(func, bitmask, thisArg); + } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) { + result = createCurry(func, bitmask, arity); + } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) { + result = createPartial(func, bitmask, thisArg, partials); + } else { + result = createHybrid.apply(undefined, newData); + } + var setter = data ? baseSetData : setData; + return setWrapToString(setter(result, newData), func, bitmask); + } -function d3_geo_pathContext(context) { - var pointRadius = 4.5; + /** + * Used by `_.defaults` to customize its `_.assignIn` use to assign properties + * of source objects to the destination object for all destination properties + * that resolve to `undefined`. + * + * @private + * @param {*} objValue The destination value. + * @param {*} srcValue The source value. + * @param {string} key The key of the property to assign. + * @param {Object} object The parent object of `objValue`. + * @returns {*} Returns the value to assign. + */ + function customDefaultsAssignIn(objValue, srcValue, key, object) { + if (objValue === undefined || + (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) { + return srcValue; + } + return objValue; + } - var stream = { - point: point, + /** + * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source + * objects into destination objects that are passed thru. + * + * @private + * @param {*} objValue The destination value. + * @param {*} srcValue The source value. + * @param {string} key The key of the property to merge. + * @param {Object} object The parent object of `objValue`. + * @param {Object} source The parent object of `srcValue`. + * @param {Object} [stack] Tracks traversed source values and their merged + * counterparts. + * @returns {*} Returns the value to assign. + */ + function customDefaultsMerge(objValue, srcValue, key, object, source, stack) { + if (isObject(objValue) && isObject(srcValue)) { + // Recursively merge objects and arrays (susceptible to call stack limits). + stack.set(srcValue, objValue); + baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack); + stack['delete'](srcValue); + } + return objValue; + } - // While inside a line, override point to moveTo then lineTo. - lineStart: function() { stream.point = pointLineStart; }, - lineEnd: lineEnd, + /** + * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain + * objects. + * + * @private + * @param {*} value The value to inspect. + * @param {string} key The key of the property to inspect. + * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`. + */ + function customOmitClone(value) { + return isPlainObject(value) ? undefined : value; + } - // While inside a polygon, override lineEnd to closePath. - polygonStart: function() { stream.lineEnd = lineEndPolygon; }, - polygonEnd: function() { stream.lineEnd = lineEnd; stream.point = point; }, + /** + * A specialized version of `baseIsEqualDeep` for arrays with support for + * partial deep comparisons. + * + * @private + * @param {Array} array The array to compare. + * @param {Array} other The other array to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} stack Tracks traversed `array` and `other` objects. + * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`. + */ + function equalArrays(array, other, bitmask, customizer, equalFunc, stack) { + var isPartial = bitmask & COMPARE_PARTIAL_FLAG, + arrLength = array.length, + othLength = other.length; - pointRadius: function(_) { - pointRadius = _; - return stream; - }, + if (arrLength != othLength && !(isPartial && othLength > arrLength)) { + return false; + } + // Assume cyclic values are equal. + var stacked = stack.get(array); + if (stacked && stack.get(other)) { + return stacked == other; + } + var index = -1, + result = true, + seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined; - result: d3_noop - }; + stack.set(array, other); + stack.set(other, array); - function point(x, y) { - context.moveTo(x, y); - context.arc(x, y, pointRadius, 0, 2 * π); - } + // Ignore non-index properties. + while (++index < arrLength) { + var arrValue = array[index], + othValue = other[index]; - function pointLineStart(x, y) { - context.moveTo(x, y); - stream.point = pointLine; - } + if (customizer) { + var compared = isPartial + ? customizer(othValue, arrValue, index, other, array, stack) + : customizer(arrValue, othValue, index, array, other, stack); + } + if (compared !== undefined) { + if (compared) { + continue; + } + result = false; + break; + } + // Recursively compare arrays (susceptible to call stack limits). + if (seen) { + if (!arraySome(other, function(othValue, othIndex) { + if (!cacheHas(seen, othIndex) && + (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) { + return seen.push(othIndex); + } + })) { + result = false; + break; + } + } else if (!( + arrValue === othValue || + equalFunc(arrValue, othValue, bitmask, customizer, stack) + )) { + result = false; + break; + } + } + stack['delete'](array); + stack['delete'](other); + return result; + } - function pointLine(x, y) { - context.lineTo(x, y); - } + /** + * A specialized version of `baseIsEqualDeep` for comparing objects of + * the same `toStringTag`. + * + * **Note:** This function only supports comparing values with tags of + * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {string} tag The `toStringTag` of the objects to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} stack Tracks traversed `object` and `other` objects. + * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. + */ + function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) { + switch (tag) { + case dataViewTag: + if ((object.byteLength != other.byteLength) || + (object.byteOffset != other.byteOffset)) { + return false; + } + object = object.buffer; + other = other.buffer; - function lineEnd() { - stream.point = point; - } + case arrayBufferTag: + if ((object.byteLength != other.byteLength) || + !equalFunc(new Uint8Array(object), new Uint8Array(other))) { + return false; + } + return true; - function lineEndPolygon() { - context.closePath(); - } + case boolTag: + case dateTag: + case numberTag: + // Coerce booleans to `1` or `0` and dates to milliseconds. + // Invalid dates are coerced to `NaN`. + return eq(+object, +other); - return stream; -} + case errorTag: + return object.name == other.name && object.message == other.message; -d3.geo.path = function() { - var pointRadius = 4.5, - projection, - context, - projectStream, - contextStream; + case regexpTag: + case stringTag: + // Coerce regexes to strings and treat strings, primitives and objects, + // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring + // for more details. + return object == (other + ''); - function path(object) { - if (object) d3.geo.stream(object, projectStream( - contextStream.pointRadius(typeof pointRadius === "function" - ? +pointRadius.apply(this, arguments) - : pointRadius))); - return contextStream.result(); - } + case mapTag: + var convert = mapToArray; - path.area = function(object) { - d3_geo_pathAreaSum = 0; - d3.geo.stream(object, projectStream(d3_geo_pathArea)); - return d3_geo_pathAreaSum; - }; + case setTag: + var isPartial = bitmask & COMPARE_PARTIAL_FLAG; + convert || (convert = setToArray); - path.centroid = function(object) { - d3_geo_centroidDimension = d3_geo_centroidX = d3_geo_centroidY = d3_geo_centroidZ = 0; - d3.geo.stream(object, projectStream(d3_geo_pathCentroid)); - return d3_geo_centroidZ ? [d3_geo_centroidX / d3_geo_centroidZ, d3_geo_centroidY / d3_geo_centroidZ] : undefined; - }; + if (object.size != other.size && !isPartial) { + return false; + } + // Assume cyclic values are equal. + var stacked = stack.get(object); + if (stacked) { + return stacked == other; + } + bitmask |= COMPARE_UNORDERED_FLAG; - path.bounds = function(object) { - return d3_geo_bounds(projectStream)(object); - }; + // Recursively compare objects (susceptible to call stack limits). + stack.set(object, other); + var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack); + stack['delete'](object); + return result; - path.projection = function(_) { - if (!arguments.length) return projection; - projectStream = (projection = _) ? _.stream || d3_geo_pathProjectStream(_) : d3_identity; - return path; - }; + case symbolTag: + if (symbolValueOf) { + return symbolValueOf.call(object) == symbolValueOf.call(other); + } + } + return false; + } - path.context = function(_) { - if (!arguments.length) return context; - contextStream = (context = _) == null ? new d3_geo_pathBuffer : new d3_geo_pathContext(_); - return path; - }; + /** + * A specialized version of `baseIsEqualDeep` for objects with support for + * partial deep comparisons. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} stack Tracks traversed `object` and `other` objects. + * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. + */ + function equalObjects(object, other, bitmask, customizer, equalFunc, stack) { + var isPartial = bitmask & COMPARE_PARTIAL_FLAG, + objProps = getAllKeys(object), + objLength = objProps.length, + othProps = getAllKeys(other), + othLength = othProps.length; + + if (objLength != othLength && !isPartial) { + return false; + } + var index = objLength; + while (index--) { + var key = objProps[index]; + if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) { + return false; + } + } + // Assume cyclic values are equal. + var stacked = stack.get(object); + if (stacked && stack.get(other)) { + return stacked == other; + } + var result = true; + stack.set(object, other); + stack.set(other, object); + + var skipCtor = isPartial; + while (++index < objLength) { + key = objProps[index]; + var objValue = object[key], + othValue = other[key]; + + if (customizer) { + var compared = isPartial + ? customizer(othValue, objValue, key, other, object, stack) + : customizer(objValue, othValue, key, object, other, stack); + } + // Recursively compare objects (susceptible to call stack limits). + if (!(compared === undefined + ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack)) + : compared + )) { + result = false; + break; + } + skipCtor || (skipCtor = key == 'constructor'); + } + if (result && !skipCtor) { + var objCtor = object.constructor, + othCtor = other.constructor; + + // Non `Object` object instances with different constructors are not equal. + if (objCtor != othCtor && + ('constructor' in object && 'constructor' in other) && + !(typeof objCtor == 'function' && objCtor instanceof objCtor && + typeof othCtor == 'function' && othCtor instanceof othCtor)) { + result = false; + } + } + stack['delete'](object); + stack['delete'](other); + return result; + } - path.pointRadius = function(_) { - if (!arguments.length) return pointRadius; - pointRadius = typeof _ === "function" ? _ : +_; - return path; - }; + /** + * A specialized version of `baseRest` which flattens the rest array. + * + * @private + * @param {Function} func The function to apply a rest parameter to. + * @returns {Function} Returns the new function. + */ + function flatRest(func) { + return setToString(overRest(func, undefined, flatten), func + ''); + } - return path.projection(d3.geo.albersUsa()).context(null); -}; + /** + * Creates an array of own enumerable property names and symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names and symbols. + */ + function getAllKeys(object) { + return baseGetAllKeys(object, keys, getSymbols); + } -function d3_geo_pathCircle(radius) { - return "m0," + radius - + "a" + radius + "," + radius + " 0 1,1 0," + (-2 * radius) - + "a" + radius + "," + radius + " 0 1,1 0," + (+2 * radius) - + "z"; -} + /** + * Creates an array of own and inherited enumerable property names and + * symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names and symbols. + */ + function getAllKeysIn(object) { + return baseGetAllKeys(object, keysIn, getSymbolsIn); + } -function d3_geo_pathProjectStream(project) { - var resample = d3_geo_resample(function(λ, φ) { return project([λ * d3_degrees, φ * d3_degrees]); }); - return function(stream) { - stream = resample(stream); - return { - point: function(λ, φ) { stream.point(λ * d3_radians, φ * d3_radians); }, - sphere: function() { stream.sphere(); }, - lineStart: function() { stream.lineStart(); }, - lineEnd: function() { stream.lineEnd(); }, - polygonStart: function() { stream.polygonStart(); }, - polygonEnd: function() { stream.polygonEnd(); } + /** + * Gets metadata for `func`. + * + * @private + * @param {Function} func The function to query. + * @returns {*} Returns the metadata for `func`. + */ + var getData = !metaMap ? noop : function(func) { + return metaMap.get(func); }; - }; -} -d3.geom = {}; -d3.geom.polygon = function(coordinates) { + /** + * Gets the name of `func`. + * + * @private + * @param {Function} func The function to query. + * @returns {string} Returns the function name. + */ + function getFuncName(func) { + var result = (func.name + ''), + array = realNames[result], + length = hasOwnProperty.call(realNames, result) ? array.length : 0; - coordinates.area = function() { - var i = 0, - n = coordinates.length, - area = coordinates[n - 1][1] * coordinates[0][0] - coordinates[n - 1][0] * coordinates[0][1]; - while (++i < n) { - area += coordinates[i - 1][1] * coordinates[i][0] - coordinates[i - 1][0] * coordinates[i][1]; + while (length--) { + var data = array[length], + otherFunc = data.func; + if (otherFunc == null || otherFunc == func) { + return data.name; + } + } + return result; } - return area * .5; - }; - coordinates.centroid = function(k) { - var i = -1, - n = coordinates.length, - x = 0, - y = 0, - a, - b = coordinates[n - 1], - c; - if (!arguments.length) k = -1 / (6 * coordinates.area()); - while (++i < n) { - a = b; - b = coordinates[i]; - c = a[0] * b[1] - b[0] * a[1]; - x += (a[0] + b[0]) * c; - y += (a[1] + b[1]) * c; + /** + * Gets the argument placeholder value for `func`. + * + * @private + * @param {Function} func The function to inspect. + * @returns {*} Returns the placeholder value. + */ + function getHolder(func) { + var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func; + return object.placeholder; } - return [x * k, y * k]; - }; - // The Sutherland-Hodgman clipping algorithm. - // Note: requires the clip polygon to be counterclockwise and convex. - coordinates.clip = function(subject) { - var input, - i = -1, - n = coordinates.length, - j, - m, - a = coordinates[n - 1], - b, - c, - d; - while (++i < n) { - input = subject.slice(); - subject.length = 0; - b = coordinates[i]; - c = input[(m = input.length) - 1]; - j = -1; - while (++j < m) { - d = input[j]; - if (d3_geom_polygonInside(d, a, b)) { - if (!d3_geom_polygonInside(c, a, b)) { - subject.push(d3_geom_polygonIntersect(c, d, a, b)); - } - subject.push(d); - } else if (d3_geom_polygonInside(c, a, b)) { - subject.push(d3_geom_polygonIntersect(c, d, a, b)); - } - c = d; - } - a = b; + /** + * Gets the appropriate "iteratee" function. If `_.iteratee` is customized, + * this function returns the custom method, otherwise it returns `baseIteratee`. + * If arguments are provided, the chosen function is invoked with them and + * its result is returned. + * + * @private + * @param {*} [value] The value to convert to an iteratee. + * @param {number} [arity] The arity of the created iteratee. + * @returns {Function} Returns the chosen function or its result. + */ + function getIteratee() { + var result = lodash.iteratee || iteratee; + result = result === iteratee ? baseIteratee : result; + return arguments.length ? result(arguments[0], arguments[1]) : result; } - return subject; - }; - return coordinates; -}; + /** + * Gets the data for `map`. + * + * @private + * @param {Object} map The map to query. + * @param {string} key The reference key. + * @returns {*} Returns the map data. + */ + function getMapData(map, key) { + var data = map.__data__; + return isKeyable(key) + ? data[typeof key == 'string' ? 'string' : 'hash'] + : data.map; + } -function d3_geom_polygonInside(p, a, b) { - return (b[0] - a[0]) * (p[1] - a[1]) < (b[1] - a[1]) * (p[0] - a[0]); -} + /** + * Gets the property names, values, and compare flags of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the match data of `object`. + */ + function getMatchData(object) { + var result = keys(object), + length = result.length; -// Intersect two infinite lines cd and ab. -function d3_geom_polygonIntersect(c, d, a, b) { - var x1 = c[0], x3 = a[0], x21 = d[0] - x1, x43 = b[0] - x3, - y1 = c[1], y3 = a[1], y21 = d[1] - y1, y43 = b[1] - y3, - ua = (x43 * (y1 - y3) - y43 * (x1 - x3)) / (y43 * x21 - x43 * y21); - return [x1 + ua * x21, y1 + ua * y21]; -} + while (length--) { + var key = result[length], + value = object[key]; -var d3_ease_default = function() { return d3_identity; }; + result[length] = [key, value, isStrictComparable(value)]; + } + return result; + } -var d3_ease = d3.map({ - linear: d3_ease_default, - poly: d3_ease_poly, - quad: function() { return d3_ease_quad; }, - cubic: function() { return d3_ease_cubic; }, - sin: function() { return d3_ease_sin; }, - exp: function() { return d3_ease_exp; }, - circle: function() { return d3_ease_circle; }, - elastic: d3_ease_elastic, - back: d3_ease_back, - bounce: function() { return d3_ease_bounce; } -}); + /** + * Gets the native function at `key` of `object`. + * + * @private + * @param {Object} object The object to query. + * @param {string} key The key of the method to get. + * @returns {*} Returns the function if it's native, else `undefined`. + */ + function getNative(object, key) { + var value = getValue(object, key); + return baseIsNative(value) ? value : undefined; + } -var d3_ease_mode = d3.map({ - "in": d3_identity, - "out": d3_ease_reverse, - "in-out": d3_ease_reflect, - "out-in": function(f) { return d3_ease_reflect(d3_ease_reverse(f)); } -}); + /** + * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values. + * + * @private + * @param {*} value The value to query. + * @returns {string} Returns the raw `toStringTag`. + */ + function getRawTag(value) { + var isOwn = hasOwnProperty.call(value, symToStringTag), + tag = value[symToStringTag]; -d3.ease = function(name) { - var i = name.indexOf("-"), - t = i >= 0 ? name.substring(0, i) : name, - m = i >= 0 ? name.substring(i + 1) : "in"; - t = d3_ease.get(t) || d3_ease_default; - m = d3_ease_mode.get(m) || d3_identity; - return d3_ease_clamp(m(t.apply(null, Array.prototype.slice.call(arguments, 1)))); -}; + try { + value[symToStringTag] = undefined; + var unmasked = true; + } catch (e) {} + + var result = nativeObjectToString.call(value); + if (unmasked) { + if (isOwn) { + value[symToStringTag] = tag; + } else { + delete value[symToStringTag]; + } + } + return result; + } -function d3_ease_clamp(f) { - return function(t) { - return t <= 0 ? 0 : t >= 1 ? 1 : f(t); - }; -} + /** + * Creates an array of the own enumerable symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of symbols. + */ + var getSymbols = !nativeGetSymbols ? stubArray : function(object) { + if (object == null) { + return []; + } + object = Object(object); + return arrayFilter(nativeGetSymbols(object), function(symbol) { + return propertyIsEnumerable.call(object, symbol); + }); + }; -function d3_ease_reverse(f) { - return function(t) { - return 1 - f(1 - t); - }; -} + /** + * Creates an array of the own and inherited enumerable symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of symbols. + */ + var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) { + var result = []; + while (object) { + arrayPush(result, getSymbols(object)); + object = getPrototype(object); + } + return result; + }; -function d3_ease_reflect(f) { - return function(t) { - return .5 * (t < .5 ? f(2 * t) : (2 - f(2 - 2 * t))); - }; -} + /** + * Gets the `toStringTag` of `value`. + * + * @private + * @param {*} value The value to query. + * @returns {string} Returns the `toStringTag`. + */ + var getTag = baseGetTag; + + // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6. + if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) || + (Map && getTag(new Map) != mapTag) || + (Promise && getTag(Promise.resolve()) != promiseTag) || + (Set && getTag(new Set) != setTag) || + (WeakMap && getTag(new WeakMap) != weakMapTag)) { + getTag = function(value) { + var result = baseGetTag(value), + Ctor = result == objectTag ? value.constructor : undefined, + ctorString = Ctor ? toSource(Ctor) : ''; + + if (ctorString) { + switch (ctorString) { + case dataViewCtorString: return dataViewTag; + case mapCtorString: return mapTag; + case promiseCtorString: return promiseTag; + case setCtorString: return setTag; + case weakMapCtorString: return weakMapTag; + } + } + return result; + }; + } -function d3_ease_quad(t) { - return t * t; -} + /** + * Gets the view, applying any `transforms` to the `start` and `end` positions. + * + * @private + * @param {number} start The start of the view. + * @param {number} end The end of the view. + * @param {Array} transforms The transformations to apply to the view. + * @returns {Object} Returns an object containing the `start` and `end` + * positions of the view. + */ + function getView(start, end, transforms) { + var index = -1, + length = transforms.length; -function d3_ease_cubic(t) { - return t * t * t; -} + while (++index < length) { + var data = transforms[index], + size = data.size; + + switch (data.type) { + case 'drop': start += size; break; + case 'dropRight': end -= size; break; + case 'take': end = nativeMin(end, start + size); break; + case 'takeRight': start = nativeMax(start, end - size); break; + } + } + return { 'start': start, 'end': end }; + } -// Optimized clamp(reflect(poly(3))). -function d3_ease_cubicInOut(t) { - if (t <= 0) return 0; - if (t >= 1) return 1; - var t2 = t * t, t3 = t2 * t; - return 4 * (t < .5 ? t3 : 3 * (t - t2) + t3 - .75); -} + /** + * Extracts wrapper details from the `source` body comment. + * + * @private + * @param {string} source The source to inspect. + * @returns {Array} Returns the wrapper details. + */ + function getWrapDetails(source) { + var match = source.match(reWrapDetails); + return match ? match[1].split(reSplitDetails) : []; + } -function d3_ease_poly(e) { - return function(t) { - return Math.pow(t, e); - }; -} + /** + * Checks if `path` exists on `object`. + * + * @private + * @param {Object} object The object to query. + * @param {Array|string} path The path to check. + * @param {Function} hasFunc The function to check properties. + * @returns {boolean} Returns `true` if `path` exists, else `false`. + */ + function hasPath(object, path, hasFunc) { + path = castPath(path, object); -function d3_ease_sin(t) { - return 1 - Math.cos(t * π / 2); -} - -function d3_ease_exp(t) { - return Math.pow(2, 10 * (t - 1)); -} - -function d3_ease_circle(t) { - return 1 - Math.sqrt(1 - t * t); -} - -function d3_ease_elastic(a, p) { - var s; - if (arguments.length < 2) p = 0.45; - if (arguments.length) s = p / (2 * π) * Math.asin(1 / a); - else a = 1, s = p / 4; - return function(t) { - return 1 + a * Math.pow(2, 10 * -t) * Math.sin((t - s) * 2 * π / p); - }; -} - -function d3_ease_back(s) { - if (!s) s = 1.70158; - return function(t) { - return t * t * ((s + 1) * t - s); - }; -} + var index = -1, + length = path.length, + result = false; -function d3_ease_bounce(t) { - return t < 1 / 2.75 ? 7.5625 * t * t - : t < 2 / 2.75 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75 - : t < 2.5 / 2.75 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375 - : 7.5625 * (t -= 2.625 / 2.75) * t + .984375; -} + while (++index < length) { + var key = toKey(path[index]); + if (!(result = object != null && hasFunc(object, key))) { + break; + } + object = object[key]; + } + if (result || ++index != length) { + return result; + } + length = object == null ? 0 : object.length; + return !!length && isLength(length) && isIndex(key, length) && + (isArray(object) || isArguments(object)); + } -function d3_transition(groups, id) { - d3_arraySubclass(groups, d3_transitionPrototype); + /** + * Initializes an array clone. + * + * @private + * @param {Array} array The array to clone. + * @returns {Array} Returns the initialized clone. + */ + function initCloneArray(array) { + var length = array.length, + result = array.constructor(length); + + // Add properties assigned by `RegExp#exec`. + if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) { + result.index = array.index; + result.input = array.input; + } + return result; + } - groups.id = id; // Note: read-only! + /** + * Initializes an object clone. + * + * @private + * @param {Object} object The object to clone. + * @returns {Object} Returns the initialized clone. + */ + function initCloneObject(object) { + return (typeof object.constructor == 'function' && !isPrototype(object)) + ? baseCreate(getPrototype(object)) + : {}; + } - return groups; -} + /** + * Initializes an object clone based on its `toStringTag`. + * + * **Note:** This function only supports cloning values with tags of + * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`. + * + * @private + * @param {Object} object The object to clone. + * @param {string} tag The `toStringTag` of the object to clone. + * @param {Function} cloneFunc The function to clone values. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the initialized clone. + */ + function initCloneByTag(object, tag, cloneFunc, isDeep) { + var Ctor = object.constructor; + switch (tag) { + case arrayBufferTag: + return cloneArrayBuffer(object); -var d3_transitionPrototype = [], - d3_transitionId = 0, - d3_transitionInheritId, - d3_transitionInherit = {ease: d3_ease_cubicInOut, delay: 0, duration: 250}; + case boolTag: + case dateTag: + return new Ctor(+object); -d3_transitionPrototype.call = d3_selectionPrototype.call; -d3_transitionPrototype.empty = d3_selectionPrototype.empty; -d3_transitionPrototype.node = d3_selectionPrototype.node; + case dataViewTag: + return cloneDataView(object, isDeep); -d3.transition = function(selection) { - return arguments.length - ? (d3_transitionInheritId ? selection.transition() : selection) - : d3_selectionRoot.transition(); -}; + case float32Tag: case float64Tag: + case int8Tag: case int16Tag: case int32Tag: + case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag: + return cloneTypedArray(object, isDeep); -d3.transition.prototype = d3_transitionPrototype; + case mapTag: + return cloneMap(object, isDeep, cloneFunc); + case numberTag: + case stringTag: + return new Ctor(object); -d3_transitionPrototype.select = function(selector) { - var id = this.id, - subgroups = [], - subgroup, - subnode, - node; + case regexpTag: + return cloneRegExp(object); - if (typeof selector !== "function") selector = d3_selection_selector(selector); + case setTag: + return cloneSet(object, isDeep, cloneFunc); - for (var j = -1, m = this.length; ++j < m;) { - subgroups.push(subgroup = []); - for (var group = this[j], i = -1, n = group.length; ++i < n;) { - if ((node = group[i]) && (subnode = selector.call(node, node.__data__, i))) { - if ("__data__" in node) subnode.__data__ = node.__data__; - d3_transitionNode(subnode, i, id, node.__transition__[id]); - subgroup.push(subnode); - } else { - subgroup.push(null); + case symbolTag: + return cloneSymbol(object); } } - } - - return d3_transition(subgroups, id); -}; - -d3_transitionPrototype.selectAll = function(selector) { - var id = this.id, - subgroups = [], - subgroup, - subnodes, - node, - subnode, - transition; - - if (typeof selector !== "function") selector = d3_selection_selectorAll(selector); - for (var j = -1, m = this.length; ++j < m;) { - for (var group = this[j], i = -1, n = group.length; ++i < n;) { - if (node = group[i]) { - transition = node.__transition__[id]; - subnodes = selector.call(node, node.__data__, i); - subgroups.push(subgroup = []); - for (var k = -1, o = subnodes.length; ++k < o;) { - d3_transitionNode(subnode = subnodes[k], k, id, transition); - subgroup.push(subnode); - } + /** + * Inserts wrapper `details` in a comment at the top of the `source` body. + * + * @private + * @param {string} source The source to modify. + * @returns {Array} details The details to insert. + * @returns {string} Returns the modified source. + */ + function insertWrapDetails(source, details) { + var length = details.length; + if (!length) { + return source; } + var lastIndex = length - 1; + details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex]; + details = details.join(length > 2 ? ', ' : ' '); + return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n'); } - } - return d3_transition(subgroups, id); -}; + /** + * Checks if `value` is a flattenable `arguments` object or array. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is flattenable, else `false`. + */ + function isFlattenable(value) { + return isArray(value) || isArguments(value) || + !!(spreadableSymbol && value && value[spreadableSymbol]); + } -d3_transitionPrototype.filter = function(filter) { - var subgroups = [], - subgroup, - group, - node; + /** + * Checks if `value` is a valid array-like index. + * + * @private + * @param {*} value The value to check. + * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index. + * @returns {boolean} Returns `true` if `value` is a valid index, else `false`. + */ + function isIndex(value, length) { + length = length == null ? MAX_SAFE_INTEGER : length; + return !!length && + (typeof value == 'number' || reIsUint.test(value)) && + (value > -1 && value % 1 == 0 && value < length); + } - if (typeof filter !== "function") filter = d3_selection_filter(filter); + /** + * Checks if the given arguments are from an iteratee call. + * + * @private + * @param {*} value The potential iteratee value argument. + * @param {*} index The potential iteratee index or key argument. + * @param {*} object The potential iteratee object argument. + * @returns {boolean} Returns `true` if the arguments are from an iteratee call, + * else `false`. + */ + function isIterateeCall(value, index, object) { + if (!isObject(object)) { + return false; + } + var type = typeof index; + if (type == 'number' + ? (isArrayLike(object) && isIndex(index, object.length)) + : (type == 'string' && index in object) + ) { + return eq(object[index], value); + } + return false; + } - for (var j = 0, m = this.length; j < m; j++) { - subgroups.push(subgroup = []); - for (var group = this[j], i = 0, n = group.length; i < n; i++) { - if ((node = group[i]) && filter.call(node, node.__data__, i)) { - subgroup.push(node); + /** + * Checks if `value` is a property name and not a property path. + * + * @private + * @param {*} value The value to check. + * @param {Object} [object] The object to query keys on. + * @returns {boolean} Returns `true` if `value` is a property name, else `false`. + */ + function isKey(value, object) { + if (isArray(value)) { + return false; + } + var type = typeof value; + if (type == 'number' || type == 'symbol' || type == 'boolean' || + value == null || isSymbol(value)) { + return true; } + return reIsPlainProp.test(value) || !reIsDeepProp.test(value) || + (object != null && value in Object(object)); } - } - return d3_transition(subgroups, this.id, this.time).ease(this.ease()); -}; -function d3_Color() {} + /** + * Checks if `value` is suitable for use as unique object key. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is suitable, else `false`. + */ + function isKeyable(value) { + var type = typeof value; + return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean') + ? (value !== '__proto__') + : (value === null); + } -d3_Color.prototype.toString = function() { - return this.rgb() + ""; -}; + /** + * Checks if `func` has a lazy counterpart. + * + * @private + * @param {Function} func The function to check. + * @returns {boolean} Returns `true` if `func` has a lazy counterpart, + * else `false`. + */ + function isLaziable(func) { + var funcName = getFuncName(func), + other = lodash[funcName]; -d3.hsl = function(h, s, l) { - return arguments.length === 1 - ? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l) - : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl)) - : d3_hsl(+h, +s, +l); -}; + if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) { + return false; + } + if (func === other) { + return true; + } + var data = getData(other); + return !!data && func === data[0]; + } -function d3_hsl(h, s, l) { - return new d3_Hsl(h, s, l); -} + /** + * Checks if `func` has its source masked. + * + * @private + * @param {Function} func The function to check. + * @returns {boolean} Returns `true` if `func` is masked, else `false`. + */ + function isMasked(func) { + return !!maskSrcKey && (maskSrcKey in func); + } -function d3_Hsl(h, s, l) { - this.h = h; - this.s = s; - this.l = l; -} + /** + * Checks if `func` is capable of being masked. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `func` is maskable, else `false`. + */ + var isMaskable = coreJsData ? isFunction : stubFalse; -var d3_hslPrototype = d3_Hsl.prototype = new d3_Color; + /** + * Checks if `value` is likely a prototype object. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a prototype, else `false`. + */ + function isPrototype(value) { + var Ctor = value && value.constructor, + proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto; -d3_hslPrototype.brighter = function(k) { - k = Math.pow(0.7, arguments.length ? k : 1); - return d3_hsl(this.h, this.s, this.l / k); -}; + return value === proto; + } -d3_hslPrototype.darker = function(k) { - k = Math.pow(0.7, arguments.length ? k : 1); - return d3_hsl(this.h, this.s, k * this.l); -}; + /** + * Checks if `value` is suitable for strict equality comparisons, i.e. `===`. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` if suitable for strict + * equality comparisons, else `false`. + */ + function isStrictComparable(value) { + return value === value && !isObject(value); + } -d3_hslPrototype.rgb = function() { - return d3_hsl_rgb(this.h, this.s, this.l); -}; + /** + * A specialized version of `matchesProperty` for source values suitable + * for strict equality comparisons, i.e. `===`. + * + * @private + * @param {string} key The key of the property to get. + * @param {*} srcValue The value to match. + * @returns {Function} Returns the new spec function. + */ + function matchesStrictComparable(key, srcValue) { + return function(object) { + if (object == null) { + return false; + } + return object[key] === srcValue && + (srcValue !== undefined || (key in Object(object))); + }; + } -function d3_hsl_rgb(h, s, l) { - var m1, - m2; + /** + * A specialized version of `_.memoize` which clears the memoized function's + * cache when it exceeds `MAX_MEMOIZE_SIZE`. + * + * @private + * @param {Function} func The function to have its output memoized. + * @returns {Function} Returns the new memoized function. + */ + function memoizeCapped(func) { + var result = memoize(func, function(key) { + if (cache.size === MAX_MEMOIZE_SIZE) { + cache.clear(); + } + return key; + }); - /* Some simple corrections for h, s and l. */ - h = h % 360; if (h < 0) h += 360; - s = s < 0 ? 0 : s > 1 ? 1 : s; - l = l < 0 ? 0 : l > 1 ? 1 : l; + var cache = result.cache; + return result; + } - /* From FvD 13.37, CSS Color Module Level 3 */ - m2 = l <= .5 ? l * (1 + s) : l + s - l * s; - m1 = 2 * l - m2; + /** + * Merges the function metadata of `source` into `data`. + * + * Merging metadata reduces the number of wrappers used to invoke a function. + * This is possible because methods like `_.bind`, `_.curry`, and `_.partial` + * may be applied regardless of execution order. Methods like `_.ary` and + * `_.rearg` modify function arguments, making the order in which they are + * executed important, preventing the merging of metadata. However, we make + * an exception for a safe combined case where curried functions have `_.ary` + * and or `_.rearg` applied. + * + * @private + * @param {Array} data The destination metadata. + * @param {Array} source The source metadata. + * @returns {Array} Returns `data`. + */ + function mergeData(data, source) { + var bitmask = data[1], + srcBitmask = source[1], + newBitmask = bitmask | srcBitmask, + isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG); + + var isCombo = + ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) || + ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) || + ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG)); + + // Exit early if metadata can't be merged. + if (!(isCommon || isCombo)) { + return data; + } + // Use source `thisArg` if available. + if (srcBitmask & WRAP_BIND_FLAG) { + data[2] = source[2]; + // Set when currying a bound function. + newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG; + } + // Compose partial arguments. + var value = source[3]; + if (value) { + var partials = data[3]; + data[3] = partials ? composeArgs(partials, value, source[4]) : value; + data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4]; + } + // Compose partial right arguments. + value = source[5]; + if (value) { + partials = data[5]; + data[5] = partials ? composeArgsRight(partials, value, source[6]) : value; + data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6]; + } + // Use source `argPos` if available. + value = source[7]; + if (value) { + data[7] = value; + } + // Use source `ary` if it's smaller. + if (srcBitmask & WRAP_ARY_FLAG) { + data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]); + } + // Use source `arity` if one is not provided. + if (data[9] == null) { + data[9] = source[9]; + } + // Use source `func` and merge bitmasks. + data[0] = source[0]; + data[1] = newBitmask; - function v(h) { - if (h > 360) h -= 360; - else if (h < 0) h += 360; - if (h < 60) return m1 + (m2 - m1) * h / 60; - if (h < 180) return m2; - if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60; - return m1; - } + return data; + } - function vv(h) { - return Math.round(v(h) * 255); - } + /** + * This function is like + * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys) + * except that it includes inherited enumerable properties. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + */ + function nativeKeysIn(object) { + var result = []; + if (object != null) { + for (var key in Object(object)) { + result.push(key); + } + } + return result; + } - return d3_rgb(vv(h + 120), vv(h), vv(h - 120)); -} + /** + * Converts `value` to a string using `Object.prototype.toString`. + * + * @private + * @param {*} value The value to convert. + * @returns {string} Returns the converted string. + */ + function objectToString(value) { + return nativeObjectToString.call(value); + } -d3.hcl = function(h, c, l) { - return arguments.length === 1 - ? (h instanceof d3_Hcl ? d3_hcl(h.h, h.c, h.l) - : (h instanceof d3_Lab ? d3_lab_hcl(h.l, h.a, h.b) - : d3_lab_hcl((h = d3_rgb_lab((h = d3.rgb(h)).r, h.g, h.b)).l, h.a, h.b))) - : d3_hcl(+h, +c, +l); -}; + /** + * A specialized version of `baseRest` which transforms the rest array. + * + * @private + * @param {Function} func The function to apply a rest parameter to. + * @param {number} [start=func.length-1] The start position of the rest parameter. + * @param {Function} transform The rest array transform. + * @returns {Function} Returns the new function. + */ + function overRest(func, start, transform) { + start = nativeMax(start === undefined ? (func.length - 1) : start, 0); + return function() { + var args = arguments, + index = -1, + length = nativeMax(args.length - start, 0), + array = Array(length); + + while (++index < length) { + array[index] = args[start + index]; + } + index = -1; + var otherArgs = Array(start + 1); + while (++index < start) { + otherArgs[index] = args[index]; + } + otherArgs[start] = transform(array); + return apply(func, this, otherArgs); + }; + } -function d3_hcl(h, c, l) { - return new d3_Hcl(h, c, l); -} + /** + * Gets the parent value at `path` of `object`. + * + * @private + * @param {Object} object The object to query. + * @param {Array} path The path to get the parent value of. + * @returns {*} Returns the parent value. + */ + function parent(object, path) { + return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1)); + } -function d3_Hcl(h, c, l) { - this.h = h; - this.c = c; - this.l = l; -} + /** + * Reorder `array` according to the specified indexes where the element at + * the first index is assigned as the first element, the element at + * the second index is assigned as the second element, and so on. + * + * @private + * @param {Array} array The array to reorder. + * @param {Array} indexes The arranged array indexes. + * @returns {Array} Returns `array`. + */ + function reorder(array, indexes) { + var arrLength = array.length, + length = nativeMin(indexes.length, arrLength), + oldArray = copyArray(array); -var d3_hclPrototype = d3_Hcl.prototype = new d3_Color; + while (length--) { + var index = indexes[length]; + array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined; + } + return array; + } -d3_hclPrototype.brighter = function(k) { - return d3_hcl(this.h, this.c, Math.min(100, this.l + d3_lab_K * (arguments.length ? k : 1))); -}; + /** + * Sets metadata for `func`. + * + * **Note:** If this function becomes hot, i.e. is invoked a lot in a short + * period of time, it will trip its breaker and transition to an identity + * function to avoid garbage collection pauses in V8. See + * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070) + * for more details. + * + * @private + * @param {Function} func The function to associate metadata with. + * @param {*} data The metadata. + * @returns {Function} Returns `func`. + */ + var setData = shortOut(baseSetData); -d3_hclPrototype.darker = function(k) { - return d3_hcl(this.h, this.c, Math.max(0, this.l - d3_lab_K * (arguments.length ? k : 1))); -}; + /** + * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout). + * + * @private + * @param {Function} func The function to delay. + * @param {number} wait The number of milliseconds to delay invocation. + * @returns {number|Object} Returns the timer id or timeout object. + */ + var setTimeout = ctxSetTimeout || function(func, wait) { + return root.setTimeout(func, wait); + }; -d3_hclPrototype.rgb = function() { - return d3_hcl_lab(this.h, this.c, this.l).rgb(); -}; + /** + * Sets the `toString` method of `func` to return `string`. + * + * @private + * @param {Function} func The function to modify. + * @param {Function} string The `toString` result. + * @returns {Function} Returns `func`. + */ + var setToString = shortOut(baseSetToString); -function d3_hcl_lab(h, c, l) { - return d3_lab(l, Math.cos(h *= d3_radians) * c, Math.sin(h) * c); -} + /** + * Sets the `toString` method of `wrapper` to mimic the source of `reference` + * with wrapper details in a comment at the top of the source body. + * + * @private + * @param {Function} wrapper The function to modify. + * @param {Function} reference The reference function. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @returns {Function} Returns `wrapper`. + */ + function setWrapToString(wrapper, reference, bitmask) { + var source = (reference + ''); + return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask))); + } -d3.lab = function(l, a, b) { - return arguments.length === 1 - ? (l instanceof d3_Lab ? d3_lab(l.l, l.a, l.b) - : (l instanceof d3_Hcl ? d3_hcl_lab(l.l, l.c, l.h) - : d3_rgb_lab((l = d3.rgb(l)).r, l.g, l.b))) - : d3_lab(+l, +a, +b); -}; + /** + * Creates a function that'll short out and invoke `identity` instead + * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN` + * milliseconds. + * + * @private + * @param {Function} func The function to restrict. + * @returns {Function} Returns the new shortable function. + */ + function shortOut(func) { + var count = 0, + lastCalled = 0; + + return function() { + var stamp = nativeNow(), + remaining = HOT_SPAN - (stamp - lastCalled); + + lastCalled = stamp; + if (remaining > 0) { + if (++count >= HOT_COUNT) { + return arguments[0]; + } + } else { + count = 0; + } + return func.apply(undefined, arguments); + }; + } -function d3_lab(l, a, b) { - return new d3_Lab(l, a, b); -} + /** + * A specialized version of `_.shuffle` which mutates and sets the size of `array`. + * + * @private + * @param {Array} array The array to shuffle. + * @param {number} [size=array.length] The size of `array`. + * @returns {Array} Returns `array`. + */ + function shuffleSelf(array, size) { + var index = -1, + length = array.length, + lastIndex = length - 1; -function d3_Lab(l, a, b) { - this.l = l; - this.a = a; - this.b = b; -} + size = size === undefined ? length : size; + while (++index < size) { + var rand = baseRandom(index, lastIndex), + value = array[rand]; -// Corresponds roughly to RGB brighter/darker -var d3_lab_K = 18; + array[rand] = array[index]; + array[index] = value; + } + array.length = size; + return array; + } -// D65 standard referent -var d3_lab_X = 0.950470, - d3_lab_Y = 1, - d3_lab_Z = 1.088830; + /** + * Converts `string` to a property path array. + * + * @private + * @param {string} string The string to convert. + * @returns {Array} Returns the property path array. + */ + var stringToPath = memoizeCapped(function(string) { + var result = []; + if (reLeadingDot.test(string)) { + result.push(''); + } + string.replace(rePropName, function(match, number, quote, string) { + result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match)); + }); + return result; + }); -var d3_labPrototype = d3_Lab.prototype = new d3_Color; + /** + * Converts `value` to a string key if it's not a string or symbol. + * + * @private + * @param {*} value The value to inspect. + * @returns {string|symbol} Returns the key. + */ + function toKey(value) { + if (typeof value == 'string' || isSymbol(value)) { + return value; + } + var result = (value + ''); + return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result; + } -d3_labPrototype.brighter = function(k) { - return d3_lab(Math.min(100, this.l + d3_lab_K * (arguments.length ? k : 1)), this.a, this.b); -}; + /** + * Converts `func` to its source code. + * + * @private + * @param {Function} func The function to convert. + * @returns {string} Returns the source code. + */ + function toSource(func) { + if (func != null) { + try { + return funcToString.call(func); + } catch (e) {} + try { + return (func + ''); + } catch (e) {} + } + return ''; + } -d3_labPrototype.darker = function(k) { - return d3_lab(Math.max(0, this.l - d3_lab_K * (arguments.length ? k : 1)), this.a, this.b); -}; + /** + * Updates wrapper `details` based on `bitmask` flags. + * + * @private + * @returns {Array} details The details to modify. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @returns {Array} Returns `details`. + */ + function updateWrapDetails(details, bitmask) { + arrayEach(wrapFlags, function(pair) { + var value = '_.' + pair[0]; + if ((bitmask & pair[1]) && !arrayIncludes(details, value)) { + details.push(value); + } + }); + return details.sort(); + } -d3_labPrototype.rgb = function() { - return d3_lab_rgb(this.l, this.a, this.b); -}; + /** + * Creates a clone of `wrapper`. + * + * @private + * @param {Object} wrapper The wrapper to clone. + * @returns {Object} Returns the cloned wrapper. + */ + function wrapperClone(wrapper) { + if (wrapper instanceof LazyWrapper) { + return wrapper.clone(); + } + var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__); + result.__actions__ = copyArray(wrapper.__actions__); + result.__index__ = wrapper.__index__; + result.__values__ = wrapper.__values__; + return result; + } -function d3_lab_rgb(l, a, b) { - var y = (l + 16) / 116, - x = y + a / 500, - z = y - b / 200; - x = d3_lab_xyz(x) * d3_lab_X; - y = d3_lab_xyz(y) * d3_lab_Y; - z = d3_lab_xyz(z) * d3_lab_Z; - return d3_rgb( - d3_xyz_rgb( 3.2404542 * x - 1.5371385 * y - 0.4985314 * z), - d3_xyz_rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z), - d3_xyz_rgb( 0.0556434 * x - 0.2040259 * y + 1.0572252 * z) - ); -} + /*------------------------------------------------------------------------*/ -function d3_lab_hcl(l, a, b) { - return d3_hcl(Math.atan2(b, a) * d3_degrees, Math.sqrt(a * a + b * b), l); -} - -function d3_lab_xyz(x) { - return x > 0.206893034 ? x * x * x : (x - 4 / 29) / 7.787037; -} -function d3_xyz_lab(x) { - return x > 0.008856 ? Math.pow(x, 1 / 3) : 7.787037 * x + 4 / 29; -} - -function d3_xyz_rgb(r) { - return Math.round(255 * (r <= 0.00304 ? 12.92 * r : 1.055 * Math.pow(r, 1 / 2.4) - 0.055)); -} + /** + * Creates an array of elements split into groups the length of `size`. + * If `array` can't be split evenly, the final chunk will be the remaining + * elements. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to process. + * @param {number} [size=1] The length of each chunk + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Array} Returns the new array of chunks. + * @example + * + * _.chunk(['a', 'b', 'c', 'd'], 2); + * // => [['a', 'b'], ['c', 'd']] + * + * _.chunk(['a', 'b', 'c', 'd'], 3); + * // => [['a', 'b', 'c'], ['d']] + */ + function chunk(array, size, guard) { + if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) { + size = 1; + } else { + size = nativeMax(toInteger(size), 0); + } + var length = array == null ? 0 : array.length; + if (!length || size < 1) { + return []; + } + var index = 0, + resIndex = 0, + result = Array(nativeCeil(length / size)); -d3.rgb = function(r, g, b) { - return arguments.length === 1 - ? (r instanceof d3_Rgb ? d3_rgb(r.r, r.g, r.b) - : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb)) - : d3_rgb(~~r, ~~g, ~~b); -}; + while (index < length) { + result[resIndex++] = baseSlice(array, index, (index += size)); + } + return result; + } -function d3_rgb(r, g, b) { - return new d3_Rgb(r, g, b); -} + /** + * Creates an array with all falsey values removed. The values `false`, `null`, + * `0`, `""`, `undefined`, and `NaN` are falsey. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to compact. + * @returns {Array} Returns the new array of filtered values. + * @example + * + * _.compact([0, 1, false, 2, '', 3]); + * // => [1, 2, 3] + */ + function compact(array) { + var index = -1, + length = array == null ? 0 : array.length, + resIndex = 0, + result = []; -function d3_Rgb(r, g, b) { - this.r = r; - this.g = g; - this.b = b; -} + while (++index < length) { + var value = array[index]; + if (value) { + result[resIndex++] = value; + } + } + return result; + } -var d3_rgbPrototype = d3_Rgb.prototype = new d3_Color; + /** + * Creates a new array concatenating `array` with any additional arrays + * and/or values. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to concatenate. + * @param {...*} [values] The values to concatenate. + * @returns {Array} Returns the new concatenated array. + * @example + * + * var array = [1]; + * var other = _.concat(array, 2, [3], [[4]]); + * + * console.log(other); + * // => [1, 2, 3, [4]] + * + * console.log(array); + * // => [1] + */ + function concat() { + var length = arguments.length; + if (!length) { + return []; + } + var args = Array(length - 1), + array = arguments[0], + index = length; -d3_rgbPrototype.brighter = function(k) { - k = Math.pow(0.7, arguments.length ? k : 1); - var r = this.r, - g = this.g, - b = this.b, - i = 30; - if (!r && !g && !b) return d3_rgb(i, i, i); - if (r && r < i) r = i; - if (g && g < i) g = i; - if (b && b < i) b = i; - return d3_rgb( - Math.min(255, Math.floor(r / k)), - Math.min(255, Math.floor(g / k)), - Math.min(255, Math.floor(b / k))); -}; + while (index--) { + args[index - 1] = arguments[index]; + } + return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1)); + } -d3_rgbPrototype.darker = function(k) { - k = Math.pow(0.7, arguments.length ? k : 1); - return d3_rgb( - Math.floor(k * this.r), - Math.floor(k * this.g), - Math.floor(k * this.b)); -}; + /** + * Creates an array of `array` values not included in the other given arrays + * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. The order and references of result values are + * determined by the first array. + * + * **Note:** Unlike `_.pullAll`, this method returns a new array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {...Array} [values] The values to exclude. + * @returns {Array} Returns the new array of filtered values. + * @see _.without, _.xor + * @example + * + * _.difference([2, 1], [2, 3]); + * // => [1] + */ + var difference = baseRest(function(array, values) { + return isArrayLikeObject(array) + ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true)) + : []; + }); -d3_rgbPrototype.hsl = function() { - return d3_rgb_hsl(this.r, this.g, this.b); -}; + /** + * This method is like `_.difference` except that it accepts `iteratee` which + * is invoked for each element of `array` and `values` to generate the criterion + * by which they're compared. The order and references of result values are + * determined by the first array. The iteratee is invoked with one argument: + * (value). + * + * **Note:** Unlike `_.pullAllBy`, this method returns a new array. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {...Array} [values] The values to exclude. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Array} Returns the new array of filtered values. + * @example + * + * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor); + * // => [1.2] + * + * // The `_.property` iteratee shorthand. + * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x'); + * // => [{ 'x': 2 }] + */ + var differenceBy = baseRest(function(array, values) { + var iteratee = last(values); + if (isArrayLikeObject(iteratee)) { + iteratee = undefined; + } + return isArrayLikeObject(array) + ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2)) + : []; + }); -d3_rgbPrototype.toString = function() { - return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b); -}; + /** + * This method is like `_.difference` except that it accepts `comparator` + * which is invoked to compare elements of `array` to `values`. The order and + * references of result values are determined by the first array. The comparator + * is invoked with two arguments: (arrVal, othVal). + * + * **Note:** Unlike `_.pullAllWith`, this method returns a new array. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {...Array} [values] The values to exclude. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of filtered values. + * @example + * + * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; + * + * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual); + * // => [{ 'x': 2, 'y': 1 }] + */ + var differenceWith = baseRest(function(array, values) { + var comparator = last(values); + if (isArrayLikeObject(comparator)) { + comparator = undefined; + } + return isArrayLikeObject(array) + ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator) + : []; + }); -function d3_rgb_hex(v) { - return v < 0x10 - ? "0" + Math.max(0, v).toString(16) - : Math.min(255, v).toString(16); -} - -function d3_rgb_parse(format, rgb, hsl) { - var r = 0, // red channel; int in [0, 255] - g = 0, // green channel; int in [0, 255] - b = 0, // blue channel; int in [0, 255] - m1, // CSS color specification match - m2, // CSS color specification type (e.g., rgb) - name; - - /* Handle hsl, rgb. */ - m1 = /([a-z]+)\((.*)\)/i.exec(format); - if (m1) { - m2 = m1[2].split(","); - switch (m1[1]) { - case "hsl": { - return hsl( - parseFloat(m2[0]), // degrees - parseFloat(m2[1]) / 100, // percentage - parseFloat(m2[2]) / 100 // percentage - ); + /** + * Creates a slice of `array` with `n` elements dropped from the beginning. + * + * @static + * @memberOf _ + * @since 0.5.0 + * @category Array + * @param {Array} array The array to query. + * @param {number} [n=1] The number of elements to drop. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Array} Returns the slice of `array`. + * @example + * + * _.drop([1, 2, 3]); + * // => [2, 3] + * + * _.drop([1, 2, 3], 2); + * // => [3] + * + * _.drop([1, 2, 3], 5); + * // => [] + * + * _.drop([1, 2, 3], 0); + * // => [1, 2, 3] + */ + function drop(array, n, guard) { + var length = array == null ? 0 : array.length; + if (!length) { + return []; } - case "rgb": { - return rgb( - d3_rgb_parseNumber(m2[0]), - d3_rgb_parseNumber(m2[1]), - d3_rgb_parseNumber(m2[2]) - ); + n = (guard || n === undefined) ? 1 : toInteger(n); + return baseSlice(array, n < 0 ? 0 : n, length); + } + + /** + * Creates a slice of `array` with `n` elements dropped from the end. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to query. + * @param {number} [n=1] The number of elements to drop. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Array} Returns the slice of `array`. + * @example + * + * _.dropRight([1, 2, 3]); + * // => [1, 2] + * + * _.dropRight([1, 2, 3], 2); + * // => [1] + * + * _.dropRight([1, 2, 3], 5); + * // => [] + * + * _.dropRight([1, 2, 3], 0); + * // => [1, 2, 3] + */ + function dropRight(array, n, guard) { + var length = array == null ? 0 : array.length; + if (!length) { + return []; } + n = (guard || n === undefined) ? 1 : toInteger(n); + n = length - n; + return baseSlice(array, 0, n < 0 ? 0 : n); } - } - /* Named colors. */ - if (name = d3_rgb_names.get(format)) return rgb(name.r, name.g, name.b); + /** + * Creates a slice of `array` excluding elements dropped from the end. + * Elements are dropped until `predicate` returns falsey. The predicate is + * invoked with three arguments: (value, index, array). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to query. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the slice of `array`. + * @example + * + * var users = [ + * { 'user': 'barney', 'active': true }, + * { 'user': 'fred', 'active': false }, + * { 'user': 'pebbles', 'active': false } + * ]; + * + * _.dropRightWhile(users, function(o) { return !o.active; }); + * // => objects for ['barney'] + * + * // The `_.matches` iteratee shorthand. + * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false }); + * // => objects for ['barney', 'fred'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.dropRightWhile(users, ['active', false]); + * // => objects for ['barney'] + * + * // The `_.property` iteratee shorthand. + * _.dropRightWhile(users, 'active'); + * // => objects for ['barney', 'fred', 'pebbles'] + */ + function dropRightWhile(array, predicate) { + return (array && array.length) + ? baseWhile(array, getIteratee(predicate, 3), true, true) + : []; + } - /* Hexadecimal colors: #rgb and #rrggbb. */ - if (format != null && format.charAt(0) === "#") { - if (format.length === 4) { - r = format.charAt(1); r += r; - g = format.charAt(2); g += g; - b = format.charAt(3); b += b; - } else if (format.length === 7) { - r = format.substring(1, 3); - g = format.substring(3, 5); - b = format.substring(5, 7); + /** + * Creates a slice of `array` excluding elements dropped from the beginning. + * Elements are dropped until `predicate` returns falsey. The predicate is + * invoked with three arguments: (value, index, array). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to query. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the slice of `array`. + * @example + * + * var users = [ + * { 'user': 'barney', 'active': false }, + * { 'user': 'fred', 'active': false }, + * { 'user': 'pebbles', 'active': true } + * ]; + * + * _.dropWhile(users, function(o) { return !o.active; }); + * // => objects for ['pebbles'] + * + * // The `_.matches` iteratee shorthand. + * _.dropWhile(users, { 'user': 'barney', 'active': false }); + * // => objects for ['fred', 'pebbles'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.dropWhile(users, ['active', false]); + * // => objects for ['pebbles'] + * + * // The `_.property` iteratee shorthand. + * _.dropWhile(users, 'active'); + * // => objects for ['barney', 'fred', 'pebbles'] + */ + function dropWhile(array, predicate) { + return (array && array.length) + ? baseWhile(array, getIteratee(predicate, 3), true) + : []; } - r = parseInt(r, 16); - g = parseInt(g, 16); - b = parseInt(b, 16); - } - return rgb(r, g, b); -} + /** + * Fills elements of `array` with `value` from `start` up to, but not + * including, `end`. + * + * **Note:** This method mutates `array`. + * + * @static + * @memberOf _ + * @since 3.2.0 + * @category Array + * @param {Array} array The array to fill. + * @param {*} value The value to fill `array` with. + * @param {number} [start=0] The start position. + * @param {number} [end=array.length] The end position. + * @returns {Array} Returns `array`. + * @example + * + * var array = [1, 2, 3]; + * + * _.fill(array, 'a'); + * console.log(array); + * // => ['a', 'a', 'a'] + * + * _.fill(Array(3), 2); + * // => [2, 2, 2] + * + * _.fill([4, 6, 8, 10], '*', 1, 3); + * // => [4, '*', '*', 10] + */ + function fill(array, value, start, end) { + var length = array == null ? 0 : array.length; + if (!length) { + return []; + } + if (start && typeof start != 'number' && isIterateeCall(array, value, start)) { + start = 0; + end = length; + } + return baseFill(array, value, start, end); + } -function d3_rgb_hsl(r, g, b) { - var min = Math.min(r /= 255, g /= 255, b /= 255), - max = Math.max(r, g, b), - d = max - min, - h, - s, - l = (max + min) / 2; - if (d) { - s = l < .5 ? d / (max + min) : d / (2 - max - min); - if (r == max) h = (g - b) / d + (g < b ? 6 : 0); - else if (g == max) h = (b - r) / d + 2; - else h = (r - g) / d + 4; - h *= 60; - } else { - s = h = 0; - } - return d3_hsl(h, s, l); -} - -function d3_rgb_lab(r, g, b) { - r = d3_rgb_xyz(r); - g = d3_rgb_xyz(g); - b = d3_rgb_xyz(b); - var x = d3_xyz_lab((0.4124564 * r + 0.3575761 * g + 0.1804375 * b) / d3_lab_X), - y = d3_xyz_lab((0.2126729 * r + 0.7151522 * g + 0.0721750 * b) / d3_lab_Y), - z = d3_xyz_lab((0.0193339 * r + 0.1191920 * g + 0.9503041 * b) / d3_lab_Z); - return d3_lab(116 * y - 16, 500 * (x - y), 200 * (y - z)); -} - -function d3_rgb_xyz(r) { - return (r /= 255) <= 0.04045 ? r / 12.92 : Math.pow((r + 0.055) / 1.055, 2.4); -} - -function d3_rgb_parseNumber(c) { // either integer or percentage - var f = parseFloat(c); - return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f; -} - -var d3_rgb_names = d3.map({ - aliceblue: "#f0f8ff", - antiquewhite: "#faebd7", - aqua: "#00ffff", - aquamarine: "#7fffd4", - azure: "#f0ffff", - beige: "#f5f5dc", - bisque: "#ffe4c4", - black: "#000000", - blanchedalmond: "#ffebcd", - blue: "#0000ff", - blueviolet: "#8a2be2", - brown: "#a52a2a", - burlywood: "#deb887", - cadetblue: "#5f9ea0", - chartreuse: "#7fff00", - chocolate: "#d2691e", - coral: "#ff7f50", - cornflowerblue: "#6495ed", - cornsilk: "#fff8dc", - crimson: "#dc143c", - cyan: "#00ffff", - darkblue: "#00008b", - darkcyan: "#008b8b", - darkgoldenrod: "#b8860b", - darkgray: "#a9a9a9", - darkgreen: "#006400", - darkgrey: "#a9a9a9", - darkkhaki: "#bdb76b", - darkmagenta: "#8b008b", - darkolivegreen: "#556b2f", - darkorange: "#ff8c00", - darkorchid: "#9932cc", - darkred: "#8b0000", - darksalmon: "#e9967a", - darkseagreen: "#8fbc8f", - darkslateblue: "#483d8b", - darkslategray: "#2f4f4f", - darkslategrey: "#2f4f4f", - darkturquoise: "#00ced1", - darkviolet: "#9400d3", - deeppink: "#ff1493", - deepskyblue: "#00bfff", - dimgray: "#696969", - dimgrey: "#696969", - dodgerblue: "#1e90ff", - firebrick: "#b22222", - floralwhite: "#fffaf0", - forestgreen: "#228b22", - fuchsia: "#ff00ff", - gainsboro: "#dcdcdc", - ghostwhite: "#f8f8ff", - gold: "#ffd700", - goldenrod: "#daa520", - gray: "#808080", - green: "#008000", - greenyellow: "#adff2f", - grey: "#808080", - honeydew: "#f0fff0", - hotpink: "#ff69b4", - indianred: "#cd5c5c", - indigo: "#4b0082", - ivory: "#fffff0", - khaki: "#f0e68c", - lavender: "#e6e6fa", - lavenderblush: "#fff0f5", - lawngreen: "#7cfc00", - lemonchiffon: "#fffacd", - lightblue: "#add8e6", - lightcoral: "#f08080", - lightcyan: "#e0ffff", - lightgoldenrodyellow: "#fafad2", - lightgray: "#d3d3d3", - lightgreen: "#90ee90", - lightgrey: "#d3d3d3", - lightpink: "#ffb6c1", - lightsalmon: "#ffa07a", - lightseagreen: "#20b2aa", - lightskyblue: "#87cefa", - lightslategray: "#778899", - lightslategrey: "#778899", - lightsteelblue: "#b0c4de", - lightyellow: "#ffffe0", - lime: "#00ff00", - limegreen: "#32cd32", - linen: "#faf0e6", - magenta: "#ff00ff", - maroon: "#800000", - mediumaquamarine: "#66cdaa", - mediumblue: "#0000cd", - mediumorchid: "#ba55d3", - mediumpurple: "#9370db", - mediumseagreen: "#3cb371", - mediumslateblue: "#7b68ee", - mediumspringgreen: "#00fa9a", - mediumturquoise: "#48d1cc", - mediumvioletred: "#c71585", - midnightblue: "#191970", - mintcream: "#f5fffa", - mistyrose: "#ffe4e1", - moccasin: "#ffe4b5", - navajowhite: "#ffdead", - navy: "#000080", - oldlace: "#fdf5e6", - olive: "#808000", - olivedrab: "#6b8e23", - orange: "#ffa500", - orangered: "#ff4500", - orchid: "#da70d6", - palegoldenrod: "#eee8aa", - palegreen: "#98fb98", - paleturquoise: "#afeeee", - palevioletred: "#db7093", - papayawhip: "#ffefd5", - peachpuff: "#ffdab9", - peru: "#cd853f", - pink: "#ffc0cb", - plum: "#dda0dd", - powderblue: "#b0e0e6", - purple: "#800080", - red: "#ff0000", - rosybrown: "#bc8f8f", - royalblue: "#4169e1", - saddlebrown: "#8b4513", - salmon: "#fa8072", - sandybrown: "#f4a460", - seagreen: "#2e8b57", - seashell: "#fff5ee", - sienna: "#a0522d", - silver: "#c0c0c0", - skyblue: "#87ceeb", - slateblue: "#6a5acd", - slategray: "#708090", - slategrey: "#708090", - snow: "#fffafa", - springgreen: "#00ff7f", - steelblue: "#4682b4", - tan: "#d2b48c", - teal: "#008080", - thistle: "#d8bfd8", - tomato: "#ff6347", - turquoise: "#40e0d0", - violet: "#ee82ee", - wheat: "#f5deb3", - white: "#ffffff", - whitesmoke: "#f5f5f5", - yellow: "#ffff00", - yellowgreen: "#9acd32" -}); + /** + * This method is like `_.find` except that it returns the index of the first + * element `predicate` returns truthy for instead of the element itself. + * + * @static + * @memberOf _ + * @since 1.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @param {number} [fromIndex=0] The index to search from. + * @returns {number} Returns the index of the found element, else `-1`. + * @example + * + * var users = [ + * { 'user': 'barney', 'active': false }, + * { 'user': 'fred', 'active': false }, + * { 'user': 'pebbles', 'active': true } + * ]; + * + * _.findIndex(users, function(o) { return o.user == 'barney'; }); + * // => 0 + * + * // The `_.matches` iteratee shorthand. + * _.findIndex(users, { 'user': 'fred', 'active': false }); + * // => 1 + * + * // The `_.matchesProperty` iteratee shorthand. + * _.findIndex(users, ['active', false]); + * // => 0 + * + * // The `_.property` iteratee shorthand. + * _.findIndex(users, 'active'); + * // => 2 + */ + function findIndex(array, predicate, fromIndex) { + var length = array == null ? 0 : array.length; + if (!length) { + return -1; + } + var index = fromIndex == null ? 0 : toInteger(fromIndex); + if (index < 0) { + index = nativeMax(length + index, 0); + } + return baseFindIndex(array, getIteratee(predicate, 3), index); + } -d3_rgb_names.forEach(function(key, value) { - d3_rgb_names.set(key, d3_rgb_parse(value, d3_rgb, d3_hsl_rgb)); -}); + /** + * This method is like `_.findIndex` except that it iterates over elements + * of `collection` from right to left. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @param {number} [fromIndex=array.length-1] The index to search from. + * @returns {number} Returns the index of the found element, else `-1`. + * @example + * + * var users = [ + * { 'user': 'barney', 'active': true }, + * { 'user': 'fred', 'active': false }, + * { 'user': 'pebbles', 'active': false } + * ]; + * + * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; }); + * // => 2 + * + * // The `_.matches` iteratee shorthand. + * _.findLastIndex(users, { 'user': 'barney', 'active': true }); + * // => 0 + * + * // The `_.matchesProperty` iteratee shorthand. + * _.findLastIndex(users, ['active', false]); + * // => 2 + * + * // The `_.property` iteratee shorthand. + * _.findLastIndex(users, 'active'); + * // => 0 + */ + function findLastIndex(array, predicate, fromIndex) { + var length = array == null ? 0 : array.length; + if (!length) { + return -1; + } + var index = length - 1; + if (fromIndex !== undefined) { + index = toInteger(fromIndex); + index = fromIndex < 0 + ? nativeMax(length + index, 0) + : nativeMin(index, length - 1); + } + return baseFindIndex(array, getIteratee(predicate, 3), index, true); + } -d3.interpolateRgb = d3_interpolateRgb; - -function d3_interpolateRgb(a, b) { - a = d3.rgb(a); - b = d3.rgb(b); - var ar = a.r, - ag = a.g, - ab = a.b, - br = b.r - ar, - bg = b.g - ag, - bb = b.b - ab; - return function(t) { - return "#" - + d3_rgb_hex(Math.round(ar + br * t)) - + d3_rgb_hex(Math.round(ag + bg * t)) - + d3_rgb_hex(Math.round(ab + bb * t)); - }; -} + /** + * Flattens `array` a single level deep. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to flatten. + * @returns {Array} Returns the new flattened array. + * @example + * + * _.flatten([1, [2, [3, [4]], 5]]); + * // => [1, 2, [3, [4]], 5] + */ + function flatten(array) { + var length = array == null ? 0 : array.length; + return length ? baseFlatten(array, 1) : []; + } -d3.transform = function(string) { - var g = d3_document.createElementNS(d3.ns.prefix.svg, "g"); - return (d3.transform = function(string) { - g.setAttribute("transform", string); - var t = g.transform.baseVal.consolidate(); - return new d3_transform(t ? t.matrix : d3_transformIdentity); - })(string); -}; + /** + * Recursively flattens `array`. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to flatten. + * @returns {Array} Returns the new flattened array. + * @example + * + * _.flattenDeep([1, [2, [3, [4]], 5]]); + * // => [1, 2, 3, 4, 5] + */ + function flattenDeep(array) { + var length = array == null ? 0 : array.length; + return length ? baseFlatten(array, INFINITY) : []; + } -// Compute x-scale and normalize the first row. -// Compute shear and make second row orthogonal to first. -// Compute y-scale and normalize the second row. -// Finally, compute the rotation. -function d3_transform(m) { - var r0 = [m.a, m.b], - r1 = [m.c, m.d], - kx = d3_transformNormalize(r0), - kz = d3_transformDot(r0, r1), - ky = d3_transformNormalize(d3_transformCombine(r1, r0, -kz)) || 0; - if (r0[0] * r1[1] < r1[0] * r0[1]) { - r0[0] *= -1; - r0[1] *= -1; - kx *= -1; - kz *= -1; - } - this.rotate = (kx ? Math.atan2(r0[1], r0[0]) : Math.atan2(-r1[0], r1[1])) * d3_degrees; - this.translate = [m.e, m.f]; - this.scale = [kx, ky]; - this.skew = ky ? Math.atan2(kz, ky) * d3_degrees : 0; -}; + /** + * Recursively flatten `array` up to `depth` times. + * + * @static + * @memberOf _ + * @since 4.4.0 + * @category Array + * @param {Array} array The array to flatten. + * @param {number} [depth=1] The maximum recursion depth. + * @returns {Array} Returns the new flattened array. + * @example + * + * var array = [1, [2, [3, [4]], 5]]; + * + * _.flattenDepth(array, 1); + * // => [1, 2, [3, [4]], 5] + * + * _.flattenDepth(array, 2); + * // => [1, 2, 3, [4], 5] + */ + function flattenDepth(array, depth) { + var length = array == null ? 0 : array.length; + if (!length) { + return []; + } + depth = depth === undefined ? 1 : toInteger(depth); + return baseFlatten(array, depth); + } -d3_transform.prototype.toString = function() { - return "translate(" + this.translate - + ")rotate(" + this.rotate - + ")skewX(" + this.skew - + ")scale(" + this.scale - + ")"; -}; + /** + * The inverse of `_.toPairs`; this method returns an object composed + * from key-value `pairs`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} pairs The key-value pairs. + * @returns {Object} Returns the new object. + * @example + * + * _.fromPairs([['a', 1], ['b', 2]]); + * // => { 'a': 1, 'b': 2 } + */ + function fromPairs(pairs) { + var index = -1, + length = pairs == null ? 0 : pairs.length, + result = {}; -function d3_transformDot(a, b) { - return a[0] * b[0] + a[1] * b[1]; -} + while (++index < length) { + var pair = pairs[index]; + result[pair[0]] = pair[1]; + } + return result; + } -function d3_transformNormalize(a) { - var k = Math.sqrt(d3_transformDot(a, a)); - if (k) { - a[0] /= k; - a[1] /= k; - } - return k; -} + /** + * Gets the first element of `array`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @alias first + * @category Array + * @param {Array} array The array to query. + * @returns {*} Returns the first element of `array`. + * @example + * + * _.head([1, 2, 3]); + * // => 1 + * + * _.head([]); + * // => undefined + */ + function head(array) { + return (array && array.length) ? array[0] : undefined; + } -function d3_transformCombine(a, b, k) { - a[0] += k * b[0]; - a[1] += k * b[1]; - return a; -} + /** + * Gets the index at which the first occurrence of `value` is found in `array` + * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. If `fromIndex` is negative, it's used as the + * offset from the end of `array`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} [fromIndex=0] The index to search from. + * @returns {number} Returns the index of the matched value, else `-1`. + * @example + * + * _.indexOf([1, 2, 1, 2], 2); + * // => 1 + * + * // Search from the `fromIndex`. + * _.indexOf([1, 2, 1, 2], 2, 2); + * // => 3 + */ + function indexOf(array, value, fromIndex) { + var length = array == null ? 0 : array.length; + if (!length) { + return -1; + } + var index = fromIndex == null ? 0 : toInteger(fromIndex); + if (index < 0) { + index = nativeMax(length + index, 0); + } + return baseIndexOf(array, value, index); + } -var d3_transformIdentity = {a: 1, b: 0, c: 0, d: 1, e: 0, f: 0}; -d3.interpolateNumber = d3_interpolateNumber; + /** + * Gets all but the last element of `array`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to query. + * @returns {Array} Returns the slice of `array`. + * @example + * + * _.initial([1, 2, 3]); + * // => [1, 2] + */ + function initial(array) { + var length = array == null ? 0 : array.length; + return length ? baseSlice(array, 0, -1) : []; + } -function d3_interpolateNumber(a, b) { - b -= a; - return function(t) { return a + b * t; }; -} + /** + * Creates an array of unique values that are included in all given arrays + * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. The order and references of result values are + * determined by the first array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @returns {Array} Returns the new array of intersecting values. + * @example + * + * _.intersection([2, 1], [2, 3]); + * // => [2] + */ + var intersection = baseRest(function(arrays) { + var mapped = arrayMap(arrays, castArrayLikeObject); + return (mapped.length && mapped[0] === arrays[0]) + ? baseIntersection(mapped) + : []; + }); -d3.interpolateTransform = d3_interpolateTransform; + /** + * This method is like `_.intersection` except that it accepts `iteratee` + * which is invoked for each element of each `arrays` to generate the criterion + * by which they're compared. The order and references of result values are + * determined by the first array. The iteratee is invoked with one argument: + * (value). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Array} Returns the new array of intersecting values. + * @example + * + * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor); + * // => [2.1] + * + * // The `_.property` iteratee shorthand. + * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); + * // => [{ 'x': 1 }] + */ + var intersectionBy = baseRest(function(arrays) { + var iteratee = last(arrays), + mapped = arrayMap(arrays, castArrayLikeObject); -function d3_interpolateTransform(a, b) { - var s = [], // string constants and placeholders - q = [], // number interpolators - n, - A = d3.transform(a), - B = d3.transform(b), - ta = A.translate, - tb = B.translate, - ra = A.rotate, - rb = B.rotate, - wa = A.skew, - wb = B.skew, - ka = A.scale, - kb = B.scale; - - if (ta[0] != tb[0] || ta[1] != tb[1]) { - s.push("translate(", null, ",", null, ")"); - q.push({i: 1, x: d3_interpolateNumber(ta[0], tb[0])}, {i: 3, x: d3_interpolateNumber(ta[1], tb[1])}); - } else if (tb[0] || tb[1]) { - s.push("translate(" + tb + ")"); - } else { - s.push(""); - } + if (iteratee === last(mapped)) { + iteratee = undefined; + } else { + mapped.pop(); + } + return (mapped.length && mapped[0] === arrays[0]) + ? baseIntersection(mapped, getIteratee(iteratee, 2)) + : []; + }); - if (ra != rb) { - if (ra - rb > 180) rb += 360; else if (rb - ra > 180) ra += 360; // shortest path - q.push({i: s.push(s.pop() + "rotate(", null, ")") - 2, x: d3_interpolateNumber(ra, rb)}); - } else if (rb) { - s.push(s.pop() + "rotate(" + rb + ")"); - } + /** + * This method is like `_.intersection` except that it accepts `comparator` + * which is invoked to compare elements of `arrays`. The order and references + * of result values are determined by the first array. The comparator is + * invoked with two arguments: (arrVal, othVal). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of intersecting values. + * @example + * + * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; + * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; + * + * _.intersectionWith(objects, others, _.isEqual); + * // => [{ 'x': 1, 'y': 2 }] + */ + var intersectionWith = baseRest(function(arrays) { + var comparator = last(arrays), + mapped = arrayMap(arrays, castArrayLikeObject); - if (wa != wb) { - q.push({i: s.push(s.pop() + "skewX(", null, ")") - 2, x: d3_interpolateNumber(wa, wb)}); - } else if (wb) { - s.push(s.pop() + "skewX(" + wb + ")"); - } - - if (ka[0] != kb[0] || ka[1] != kb[1]) { - n = s.push(s.pop() + "scale(", null, ",", null, ")"); - q.push({i: n - 4, x: d3_interpolateNumber(ka[0], kb[0])}, {i: n - 2, x: d3_interpolateNumber(ka[1], kb[1])}); - } else if (kb[0] != 1 || kb[1] != 1) { - s.push(s.pop() + "scale(" + kb + ")"); - } - - n = q.length; - return function(t) { - var i = -1, o; - while (++i < n) s[(o = q[i]).i] = o.x(t); - return s.join(""); - }; -} - -d3.interpolateObject = d3_interpolateObject; + comparator = typeof comparator == 'function' ? comparator : undefined; + if (comparator) { + mapped.pop(); + } + return (mapped.length && mapped[0] === arrays[0]) + ? baseIntersection(mapped, undefined, comparator) + : []; + }); -function d3_interpolateObject(a, b) { - var i = {}, - c = {}, - k; - for (k in a) { - if (k in b) { - i[k] = d3_interpolateByName(k)(a[k], b[k]); - } else { - c[k] = a[k]; - } - } - for (k in b) { - if (!(k in a)) { - c[k] = b[k]; + /** + * Converts all elements in `array` into a string separated by `separator`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to convert. + * @param {string} [separator=','] The element separator. + * @returns {string} Returns the joined string. + * @example + * + * _.join(['a', 'b', 'c'], '~'); + * // => 'a~b~c' + */ + function join(array, separator) { + return array == null ? '' : nativeJoin.call(array, separator); } - } - return function(t) { - for (k in i) c[k] = i[k](t); - return c; - }; -} - -d3.interpolateArray = d3_interpolateArray; - -function d3_interpolateArray(a, b) { - var x = [], - c = [], - na = a.length, - nb = b.length, - n0 = Math.min(a.length, b.length), - i; - for (i = 0; i < n0; ++i) x.push(d3_interpolate(a[i], b[i])); - for (; i < na; ++i) c[i] = a[i]; - for (; i < nb; ++i) c[i] = b[i]; - return function(t) { - for (i = 0; i < n0; ++i) c[i] = x[i](t); - return c; - }; -} -d3.interpolateString = d3_interpolateString; + /** + * Gets the last element of `array`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to query. + * @returns {*} Returns the last element of `array`. + * @example + * + * _.last([1, 2, 3]); + * // => 3 + */ + function last(array) { + var length = array == null ? 0 : array.length; + return length ? array[length - 1] : undefined; + } -function d3_interpolateString(a, b) { - var m, // current match - i, // current index - j, // current index (for coalescing) - s0 = 0, // start index of current string prefix - s1 = 0, // end index of current string prefix - s = [], // string constants and placeholders - q = [], // number interpolators - n, // q.length - o; - - // Reset our regular expression! - d3_interpolate_number.lastIndex = 0; - - // Find all numbers in b. - for (i = 0; m = d3_interpolate_number.exec(b); ++i) { - if (m.index) s.push(b.substring(s0, s1 = m.index)); - q.push({i: s.length, x: m[0]}); - s.push(null); - s0 = d3_interpolate_number.lastIndex; - } - if (s0 < b.length) s.push(b.substring(s0)); - - // Find all numbers in a. - for (i = 0, n = q.length; (m = d3_interpolate_number.exec(a)) && i < n; ++i) { - o = q[i]; - if (o.x == m[0]) { // The numbers match, so coalesce. - if (o.i) { - if (s[o.i + 1] == null) { // This match is followed by another number. - s[o.i - 1] += o.x; - s.splice(o.i, 1); - for (j = i + 1; j < n; ++j) q[j].i--; - } else { // This match is followed by a string, so coalesce twice. - s[o.i - 1] += o.x + s[o.i + 1]; - s.splice(o.i, 2); - for (j = i + 1; j < n; ++j) q[j].i -= 2; - } - } else { - if (s[o.i + 1] == null) { // This match is followed by another number. - s[o.i] = o.x; - } else { // This match is followed by a string, so coalesce twice. - s[o.i] = o.x + s[o.i + 1]; - s.splice(o.i + 1, 1); - for (j = i + 1; j < n; ++j) q[j].i--; - } + /** + * This method is like `_.indexOf` except that it iterates over elements of + * `array` from right to left. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} [fromIndex=array.length-1] The index to search from. + * @returns {number} Returns the index of the matched value, else `-1`. + * @example + * + * _.lastIndexOf([1, 2, 1, 2], 2); + * // => 3 + * + * // Search from the `fromIndex`. + * _.lastIndexOf([1, 2, 1, 2], 2, 2); + * // => 1 + */ + function lastIndexOf(array, value, fromIndex) { + var length = array == null ? 0 : array.length; + if (!length) { + return -1; } - q.splice(i, 1); - n--; - i--; - } else { - o.x = d3_interpolateNumber(parseFloat(m[0]), parseFloat(o.x)); + var index = length; + if (fromIndex !== undefined) { + index = toInteger(fromIndex); + index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1); + } + return value === value + ? strictLastIndexOf(array, value, index) + : baseFindIndex(array, baseIsNaN, index, true); } - } - // Remove any numbers in b not found in a. - while (i < n) { - o = q.pop(); - if (s[o.i + 1] == null) { // This match is followed by another number. - s[o.i] = o.x; - } else { // This match is followed by a string, so coalesce twice. - s[o.i] = o.x + s[o.i + 1]; - s.splice(o.i + 1, 1); + /** + * Gets the element at index `n` of `array`. If `n` is negative, the nth + * element from the end is returned. + * + * @static + * @memberOf _ + * @since 4.11.0 + * @category Array + * @param {Array} array The array to query. + * @param {number} [n=0] The index of the element to return. + * @returns {*} Returns the nth element of `array`. + * @example + * + * var array = ['a', 'b', 'c', 'd']; + * + * _.nth(array, 1); + * // => 'b' + * + * _.nth(array, -2); + * // => 'c'; + */ + function nth(array, n) { + return (array && array.length) ? baseNth(array, toInteger(n)) : undefined; } - n--; - } - - // Special optimization for only a single match. - if (s.length === 1) { - return s[0] == null ? q[0].x : function() { return b; }; - } - - // Otherwise, interpolate each of the numbers and rejoin the string. - return function(t) { - for (i = 0; i < n; ++i) s[(o = q[i]).i] = o.x(t); - return s.join(""); - }; -} - -var d3_interpolate_number = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g; - -d3.interpolate = d3_interpolate; - -function d3_interpolate(a, b) { - var i = d3.interpolators.length, f; - while (--i >= 0 && !(f = d3.interpolators[i](a, b))); - return f; -} - -function d3_interpolateByName(name) { - return name == "transform" - ? d3_interpolateTransform - : d3_interpolate; -} -d3.interpolators = [ - d3_interpolateObject, - function(a, b) { return Array.isArray(b) && d3_interpolateArray(a, b); }, - function(a, b) { return (typeof a === "string" || typeof b === "string") && d3_interpolateString(a + "", b + ""); }, - function(a, b) { return (typeof b === "string" ? d3_rgb_names.has(b) || /^(#|rgb\(|hsl\()/.test(b) : b instanceof d3_Color) && d3_interpolateRgb(a, b); }, - function(a, b) { return !isNaN(a = +a) && !isNaN(b = +b) && d3_interpolateNumber(a, b); } -]; + /** + * Removes all given values from `array` using + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. + * + * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove` + * to remove elements from an array by predicate. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Array + * @param {Array} array The array to modify. + * @param {...*} [values] The values to remove. + * @returns {Array} Returns `array`. + * @example + * + * var array = ['a', 'b', 'c', 'a', 'b', 'c']; + * + * _.pull(array, 'a', 'c'); + * console.log(array); + * // => ['b', 'b'] + */ + var pull = baseRest(pullAll); -d3_transitionPrototype.tween = function(name, tween) { - var id = this.id; - if (arguments.length < 2) return this.node().__transition__[id].tween.get(name); - return d3_selection_each(this, tween == null - ? function(node) { node.__transition__[id].tween.remove(name); } - : function(node) { node.__transition__[id].tween.set(name, tween); }); -}; + /** + * This method is like `_.pull` except that it accepts an array of values to remove. + * + * **Note:** Unlike `_.difference`, this method mutates `array`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to modify. + * @param {Array} values The values to remove. + * @returns {Array} Returns `array`. + * @example + * + * var array = ['a', 'b', 'c', 'a', 'b', 'c']; + * + * _.pullAll(array, ['a', 'c']); + * console.log(array); + * // => ['b', 'b'] + */ + function pullAll(array, values) { + return (array && array.length && values && values.length) + ? basePullAll(array, values) + : array; + } -function d3_transition_tween(groups, name, value, tween) { - var id = groups.id; - return d3_selection_each(groups, typeof value === "function" - ? function(node, i, j) { node.__transition__[id].tween.set(name, tween(value.call(node, node.__data__, i, j))); } - : (value = tween(value), function(node) { node.__transition__[id].tween.set(name, value); })); -} + /** + * This method is like `_.pullAll` except that it accepts `iteratee` which is + * invoked for each element of `array` and `values` to generate the criterion + * by which they're compared. The iteratee is invoked with one argument: (value). + * + * **Note:** Unlike `_.differenceBy`, this method mutates `array`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to modify. + * @param {Array} values The values to remove. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Array} Returns `array`. + * @example + * + * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }]; + * + * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x'); + * console.log(array); + * // => [{ 'x': 2 }] + */ + function pullAllBy(array, values, iteratee) { + return (array && array.length && values && values.length) + ? basePullAll(array, values, getIteratee(iteratee, 2)) + : array; + } -d3_transitionPrototype.attr = function(nameNS, value) { - if (arguments.length < 2) { + /** + * This method is like `_.pullAll` except that it accepts `comparator` which + * is invoked to compare elements of `array` to `values`. The comparator is + * invoked with two arguments: (arrVal, othVal). + * + * **Note:** Unlike `_.differenceWith`, this method mutates `array`. + * + * @static + * @memberOf _ + * @since 4.6.0 + * @category Array + * @param {Array} array The array to modify. + * @param {Array} values The values to remove. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns `array`. + * @example + * + * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }]; + * + * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual); + * console.log(array); + * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }] + */ + function pullAllWith(array, values, comparator) { + return (array && array.length && values && values.length) + ? basePullAll(array, values, undefined, comparator) + : array; + } - // For attr(object), the object specifies the names and values of the - // attributes to transition. The values may be functions that are - // evaluated for each element. - for (value in nameNS) this.attr(value, nameNS[value]); - return this; - } + /** + * Removes elements from `array` corresponding to `indexes` and returns an + * array of removed elements. + * + * **Note:** Unlike `_.at`, this method mutates `array`. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to modify. + * @param {...(number|number[])} [indexes] The indexes of elements to remove. + * @returns {Array} Returns the new array of removed elements. + * @example + * + * var array = ['a', 'b', 'c', 'd']; + * var pulled = _.pullAt(array, [1, 3]); + * + * console.log(array); + * // => ['a', 'c'] + * + * console.log(pulled); + * // => ['b', 'd'] + */ + var pullAt = flatRest(function(array, indexes) { + var length = array == null ? 0 : array.length, + result = baseAt(array, indexes); - var interpolate = d3_interpolateByName(nameNS), - name = d3.ns.qualify(nameNS); + basePullAt(array, arrayMap(indexes, function(index) { + return isIndex(index, length) ? +index : index; + }).sort(compareAscending)); - // For attr(string, null), remove the attribute with the specified name. - function attrNull() { - this.removeAttribute(name); - } - function attrNullNS() { - this.removeAttributeNS(name.space, name.local); - } + return result; + }); - return d3_transition_tween(this, "attr." + nameNS, value, function(b) { + /** + * Removes all elements from `array` that `predicate` returns truthy for + * and returns an array of the removed elements. The predicate is invoked + * with three arguments: (value, index, array). + * + * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull` + * to pull elements from an array by value. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Array + * @param {Array} array The array to modify. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new array of removed elements. + * @example + * + * var array = [1, 2, 3, 4]; + * var evens = _.remove(array, function(n) { + * return n % 2 == 0; + * }); + * + * console.log(array); + * // => [1, 3] + * + * console.log(evens); + * // => [2, 4] + */ + function remove(array, predicate) { + var result = []; + if (!(array && array.length)) { + return result; + } + var index = -1, + indexes = [], + length = array.length; - // For attr(string, string), set the attribute with the specified name. - function attrString() { - var a = this.getAttribute(name), i; - return a !== b && (i = interpolate(a, b), function(t) { this.setAttribute(name, i(t)); }); - } - function attrStringNS() { - var a = this.getAttributeNS(name.space, name.local), i; - return a !== b && (i = interpolate(a, b), function(t) { this.setAttributeNS(name.space, name.local, i(t)); }); + predicate = getIteratee(predicate, 3); + while (++index < length) { + var value = array[index]; + if (predicate(value, index, array)) { + result.push(value); + indexes.push(index); + } + } + basePullAt(array, indexes); + return result; } - return b == null ? (name.local ? attrNullNS : attrNull) - : (b += "", name.local ? attrStringNS : attrString); - }); -}; - -d3_transitionPrototype.attrTween = function(nameNS, tween) { - var name = d3.ns.qualify(nameNS); + /** + * Reverses `array` so that the first element becomes the last, the second + * element becomes the second to last, and so on. + * + * **Note:** This method mutates `array` and is based on + * [`Array#reverse`](https://mdn.io/Array/reverse). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to modify. + * @returns {Array} Returns `array`. + * @example + * + * var array = [1, 2, 3]; + * + * _.reverse(array); + * // => [3, 2, 1] + * + * console.log(array); + * // => [3, 2, 1] + */ + function reverse(array) { + return array == null ? array : nativeReverse.call(array); + } - function attrTween(d, i) { - var f = tween.call(this, d, i, this.getAttribute(name)); - return f && function(t) { this.setAttribute(name, f(t)); }; - } + /** + * Creates a slice of `array` from `start` up to, but not including, `end`. + * + * **Note:** This method is used instead of + * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are + * returned. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to slice. + * @param {number} [start=0] The start position. + * @param {number} [end=array.length] The end position. + * @returns {Array} Returns the slice of `array`. + */ + function slice(array, start, end) { + var length = array == null ? 0 : array.length; + if (!length) { + return []; + } + if (end && typeof end != 'number' && isIterateeCall(array, start, end)) { + start = 0; + end = length; + } + else { + start = start == null ? 0 : toInteger(start); + end = end === undefined ? length : toInteger(end); + } + return baseSlice(array, start, end); + } - function attrTweenNS(d, i) { - var f = tween.call(this, d, i, this.getAttributeNS(name.space, name.local)); - return f && function(t) { this.setAttributeNS(name.space, name.local, f(t)); }; - } + /** + * Uses a binary search to determine the lowest index at which `value` + * should be inserted into `array` in order to maintain its sort order. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The sorted array to inspect. + * @param {*} value The value to evaluate. + * @returns {number} Returns the index at which `value` should be inserted + * into `array`. + * @example + * + * _.sortedIndex([30, 50], 40); + * // => 1 + */ + function sortedIndex(array, value) { + return baseSortedIndex(array, value); + } - return this.tween("attr." + nameNS, name.local ? attrTweenNS : attrTween); -}; + /** + * This method is like `_.sortedIndex` except that it accepts `iteratee` + * which is invoked for `value` and each element of `array` to compute their + * sort ranking. The iteratee is invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The sorted array to inspect. + * @param {*} value The value to evaluate. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {number} Returns the index at which `value` should be inserted + * into `array`. + * @example + * + * var objects = [{ 'x': 4 }, { 'x': 5 }]; + * + * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; }); + * // => 0 + * + * // The `_.property` iteratee shorthand. + * _.sortedIndexBy(objects, { 'x': 4 }, 'x'); + * // => 0 + */ + function sortedIndexBy(array, value, iteratee) { + return baseSortedIndexBy(array, value, getIteratee(iteratee, 2)); + } -d3_transitionPrototype.style = function(name, value, priority) { - var n = arguments.length; - if (n < 3) { - - // For style(object) or style(object, string), the object specifies the - // names and values of the attributes to set or remove. The values may be - // functions that are evaluated for each element. The optional string - // specifies the priority. - if (typeof name !== "string") { - if (n < 2) value = ""; - for (priority in name) this.style(priority, name[priority], value); - return this; + /** + * This method is like `_.indexOf` except that it performs a binary + * search on a sorted `array`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @returns {number} Returns the index of the matched value, else `-1`. + * @example + * + * _.sortedIndexOf([4, 5, 5, 5, 6], 5); + * // => 1 + */ + function sortedIndexOf(array, value) { + var length = array == null ? 0 : array.length; + if (length) { + var index = baseSortedIndex(array, value); + if (index < length && eq(array[index], value)) { + return index; + } + } + return -1; } - // For style(string, string) or style(string, function), use the default - // priority. The priority is ignored for style(string, null). - priority = ""; - } + /** + * This method is like `_.sortedIndex` except that it returns the highest + * index at which `value` should be inserted into `array` in order to + * maintain its sort order. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The sorted array to inspect. + * @param {*} value The value to evaluate. + * @returns {number} Returns the index at which `value` should be inserted + * into `array`. + * @example + * + * _.sortedLastIndex([4, 5, 5, 5, 6], 5); + * // => 4 + */ + function sortedLastIndex(array, value) { + return baseSortedIndex(array, value, true); + } - var interpolate = d3_interpolateByName(name); + /** + * This method is like `_.sortedLastIndex` except that it accepts `iteratee` + * which is invoked for `value` and each element of `array` to compute their + * sort ranking. The iteratee is invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The sorted array to inspect. + * @param {*} value The value to evaluate. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {number} Returns the index at which `value` should be inserted + * into `array`. + * @example + * + * var objects = [{ 'x': 4 }, { 'x': 5 }]; + * + * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; }); + * // => 1 + * + * // The `_.property` iteratee shorthand. + * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x'); + * // => 1 + */ + function sortedLastIndexBy(array, value, iteratee) { + return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true); + } - // For style(name, null) or style(name, null, priority), remove the style - // property with the specified name. The priority is ignored. - function styleNull() { - this.style.removeProperty(name); - } + /** + * This method is like `_.lastIndexOf` except that it performs a binary + * search on a sorted `array`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @returns {number} Returns the index of the matched value, else `-1`. + * @example + * + * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5); + * // => 3 + */ + function sortedLastIndexOf(array, value) { + var length = array == null ? 0 : array.length; + if (length) { + var index = baseSortedIndex(array, value, true) - 1; + if (eq(array[index], value)) { + return index; + } + } + return -1; + } - // Otherwise, a name, value and priority are specified, and handled as below. - return d3_transition_tween(this, "style." + name, value, function(b) { + /** + * This method is like `_.uniq` except that it's designed and optimized + * for sorted arrays. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @returns {Array} Returns the new duplicate free array. + * @example + * + * _.sortedUniq([1, 1, 2]); + * // => [1, 2] + */ + function sortedUniq(array) { + return (array && array.length) + ? baseSortedUniq(array) + : []; + } - // For style(name, string) or style(name, string, priority), set the style - // property with the specified name, using the specified priority. - function styleString() { - var a = d3_window.getComputedStyle(this, null).getPropertyValue(name), i; - return a !== b && (i = interpolate(a, b), function(t) { this.style.setProperty(name, i(t), priority); }); + /** + * This method is like `_.uniqBy` except that it's designed and optimized + * for sorted arrays. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {Function} [iteratee] The iteratee invoked per element. + * @returns {Array} Returns the new duplicate free array. + * @example + * + * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor); + * // => [1.1, 2.3] + */ + function sortedUniqBy(array, iteratee) { + return (array && array.length) + ? baseSortedUniq(array, getIteratee(iteratee, 2)) + : []; } - return b == null ? styleNull - : (b += "", styleString); - }); -}; + /** + * Gets all but the first element of `array`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to query. + * @returns {Array} Returns the slice of `array`. + * @example + * + * _.tail([1, 2, 3]); + * // => [2, 3] + */ + function tail(array) { + var length = array == null ? 0 : array.length; + return length ? baseSlice(array, 1, length) : []; + } -d3_transitionPrototype.styleTween = function(name, tween, priority) { - if (arguments.length < 3) priority = ""; - return this.tween("style." + name, function(d, i) { - var f = tween.call(this, d, i, d3_window.getComputedStyle(this, null).getPropertyValue(name)); - return f && function(t) { this.style.setProperty(name, f(t), priority); }; - }); -}; + /** + * Creates a slice of `array` with `n` elements taken from the beginning. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to query. + * @param {number} [n=1] The number of elements to take. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Array} Returns the slice of `array`. + * @example + * + * _.take([1, 2, 3]); + * // => [1] + * + * _.take([1, 2, 3], 2); + * // => [1, 2] + * + * _.take([1, 2, 3], 5); + * // => [1, 2, 3] + * + * _.take([1, 2, 3], 0); + * // => [] + */ + function take(array, n, guard) { + if (!(array && array.length)) { + return []; + } + n = (guard || n === undefined) ? 1 : toInteger(n); + return baseSlice(array, 0, n < 0 ? 0 : n); + } -d3_transitionPrototype.text = function(value) { - return d3_transition_tween(this, "text", value, d3_transition_text); -}; - -function d3_transition_text(b) { - if (b == null) b = ""; - return function() { this.textContent = b; }; -} - -d3_transitionPrototype.remove = function() { - return this.each("end.transition", function() { - var p; - if (!this.__transition__ && (p = this.parentNode)) p.removeChild(this); - }); -}; - -d3_transitionPrototype.ease = function(value) { - var id = this.id; - if (arguments.length < 1) return this.node().__transition__[id].ease; - if (typeof value !== "function") value = d3.ease.apply(d3, arguments); - return d3_selection_each(this, function(node) { node.__transition__[id].ease = value; }); -}; - -d3_transitionPrototype.delay = function(value) { - var id = this.id; - return d3_selection_each(this, typeof value === "function" - ? function(node, i, j) { node.__transition__[id].delay = value.call(node, node.__data__, i, j) | 0; } - : (value |= 0, function(node) { node.__transition__[id].delay = value; })); -}; - -d3_transitionPrototype.duration = function(value) { - var id = this.id; - return d3_selection_each(this, typeof value === "function" - ? function(node, i, j) { node.__transition__[id].duration = Math.max(1, value.call(node, node.__data__, i, j) | 0); } - : (value = Math.max(1, value | 0), function(node) { node.__transition__[id].duration = value; })); -}; - -d3_transitionPrototype.each = function(type, listener) { - var id = this.id; - if (arguments.length < 2) { - var inherit = d3_transitionInherit, - inheritId = d3_transitionInheritId; - d3_transitionInheritId = id; - d3_selection_each(this, function(node, i, j) { - d3_transitionInherit = node.__transition__[id]; - type.call(node, node.__data__, i, j); - }); - d3_transitionInherit = inherit; - d3_transitionInheritId = inheritId; - } else { - d3_selection_each(this, function(node) { - node.__transition__[id].event.on(type, listener); - }); - } - return this; -}; - -d3_transitionPrototype.transition = function() { - var id0 = this.id, - id1 = ++d3_transitionId, - subgroups = [], - subgroup, - group, - node, - transition; - - for (var j = 0, m = this.length; j < m; j++) { - subgroups.push(subgroup = []); - for (var group = this[j], i = 0, n = group.length; i < n; i++) { - if (node = group[i]) { - transition = Object.create(node.__transition__[id0]); - transition.delay += transition.duration; - d3_transitionNode(node, i, id1, transition); + /** + * Creates a slice of `array` with `n` elements taken from the end. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to query. + * @param {number} [n=1] The number of elements to take. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Array} Returns the slice of `array`. + * @example + * + * _.takeRight([1, 2, 3]); + * // => [3] + * + * _.takeRight([1, 2, 3], 2); + * // => [2, 3] + * + * _.takeRight([1, 2, 3], 5); + * // => [1, 2, 3] + * + * _.takeRight([1, 2, 3], 0); + * // => [] + */ + function takeRight(array, n, guard) { + var length = array == null ? 0 : array.length; + if (!length) { + return []; } - subgroup.push(node); + n = (guard || n === undefined) ? 1 : toInteger(n); + n = length - n; + return baseSlice(array, n < 0 ? 0 : n, length); } - } - - return d3_transition(subgroups, id1); -}; -function d3_transitionNode(node, i, id, inherit) { - var lock = node.__transition__ || (node.__transition__ = {active: 0, count: 0}), - transition = lock[id]; + /** + * Creates a slice of `array` with elements taken from the end. Elements are + * taken until `predicate` returns falsey. The predicate is invoked with + * three arguments: (value, index, array). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to query. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the slice of `array`. + * @example + * + * var users = [ + * { 'user': 'barney', 'active': true }, + * { 'user': 'fred', 'active': false }, + * { 'user': 'pebbles', 'active': false } + * ]; + * + * _.takeRightWhile(users, function(o) { return !o.active; }); + * // => objects for ['fred', 'pebbles'] + * + * // The `_.matches` iteratee shorthand. + * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false }); + * // => objects for ['pebbles'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.takeRightWhile(users, ['active', false]); + * // => objects for ['fred', 'pebbles'] + * + * // The `_.property` iteratee shorthand. + * _.takeRightWhile(users, 'active'); + * // => [] + */ + function takeRightWhile(array, predicate) { + return (array && array.length) + ? baseWhile(array, getIteratee(predicate, 3), false, true) + : []; + } - if (!transition) { - var time = inherit.time; + /** + * Creates a slice of `array` with elements taken from the beginning. Elements + * are taken until `predicate` returns falsey. The predicate is invoked with + * three arguments: (value, index, array). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Array + * @param {Array} array The array to query. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the slice of `array`. + * @example + * + * var users = [ + * { 'user': 'barney', 'active': false }, + * { 'user': 'fred', 'active': false }, + * { 'user': 'pebbles', 'active': true } + * ]; + * + * _.takeWhile(users, function(o) { return !o.active; }); + * // => objects for ['barney', 'fred'] + * + * // The `_.matches` iteratee shorthand. + * _.takeWhile(users, { 'user': 'barney', 'active': false }); + * // => objects for ['barney'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.takeWhile(users, ['active', false]); + * // => objects for ['barney', 'fred'] + * + * // The `_.property` iteratee shorthand. + * _.takeWhile(users, 'active'); + * // => [] + */ + function takeWhile(array, predicate) { + return (array && array.length) + ? baseWhile(array, getIteratee(predicate, 3)) + : []; + } - transition = lock[id] = { - tween: new d3_Map, - event: d3.dispatch("start", "end"), // TODO construct lazily? - time: time, - ease: inherit.ease, - delay: inherit.delay, - duration: inherit.duration - }; + /** + * Creates an array of unique values, in order, from all given arrays using + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @returns {Array} Returns the new array of combined values. + * @example + * + * _.union([2], [1, 2]); + * // => [2, 1] + */ + var union = baseRest(function(arrays) { + return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true)); + }); - ++lock.count; + /** + * This method is like `_.union` except that it accepts `iteratee` which is + * invoked for each element of each `arrays` to generate the criterion by + * which uniqueness is computed. Result values are chosen from the first + * array in which the value occurs. The iteratee is invoked with one argument: + * (value). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Array} Returns the new array of combined values. + * @example + * + * _.unionBy([2.1], [1.2, 2.3], Math.floor); + * // => [2.1, 1.2] + * + * // The `_.property` iteratee shorthand. + * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); + * // => [{ 'x': 1 }, { 'x': 2 }] + */ + var unionBy = baseRest(function(arrays) { + var iteratee = last(arrays); + if (isArrayLikeObject(iteratee)) { + iteratee = undefined; + } + return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2)); + }); - d3.timer(function(elapsed) { - var d = node.__data__, - ease = transition.ease, - event = transition.event, - delay = transition.delay, - duration = transition.duration, - tweened = []; + /** + * This method is like `_.union` except that it accepts `comparator` which + * is invoked to compare elements of `arrays`. Result values are chosen from + * the first array in which the value occurs. The comparator is invoked + * with two arguments: (arrVal, othVal). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of combined values. + * @example + * + * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; + * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; + * + * _.unionWith(objects, others, _.isEqual); + * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }] + */ + var unionWith = baseRest(function(arrays) { + var comparator = last(arrays); + comparator = typeof comparator == 'function' ? comparator : undefined; + return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator); + }); - return delay <= elapsed - ? start(elapsed) - : d3.timer(start, delay, time), 1; + /** + * Creates a duplicate-free version of an array, using + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons, in which only the first occurrence of each element + * is kept. The order of result values is determined by the order they occur + * in the array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @returns {Array} Returns the new duplicate free array. + * @example + * + * _.uniq([2, 1, 2]); + * // => [2, 1] + */ + function uniq(array) { + return (array && array.length) ? baseUniq(array) : []; + } - function start(elapsed) { - if (lock.active > id) return stop(); - lock.active = id; - event.start.call(node, d, i); + /** + * This method is like `_.uniq` except that it accepts `iteratee` which is + * invoked for each element in `array` to generate the criterion by which + * uniqueness is computed. The order of result values is determined by the + * order they occur in the array. The iteratee is invoked with one argument: + * (value). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Array} Returns the new duplicate free array. + * @example + * + * _.uniqBy([2.1, 1.2, 2.3], Math.floor); + * // => [2.1, 1.2] + * + * // The `_.property` iteratee shorthand. + * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); + * // => [{ 'x': 1 }, { 'x': 2 }] + */ + function uniqBy(array, iteratee) { + return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : []; + } - transition.tween.forEach(function(key, value) { - if (value = value.call(node, d, i)) { - tweened.push(value); - } - }); + /** + * This method is like `_.uniq` except that it accepts `comparator` which + * is invoked to compare elements of `array`. The order of result values is + * determined by the order they occur in the array.The comparator is invoked + * with two arguments: (arrVal, othVal). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new duplicate free array. + * @example + * + * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }]; + * + * _.uniqWith(objects, _.isEqual); + * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }] + */ + function uniqWith(array, comparator) { + comparator = typeof comparator == 'function' ? comparator : undefined; + return (array && array.length) ? baseUniq(array, undefined, comparator) : []; + } - if (!tick(elapsed)) d3.timer(tick, 0, time); - return 1; + /** + * This method is like `_.zip` except that it accepts an array of grouped + * elements and creates an array regrouping the elements to their pre-zip + * configuration. + * + * @static + * @memberOf _ + * @since 1.2.0 + * @category Array + * @param {Array} array The array of grouped elements to process. + * @returns {Array} Returns the new array of regrouped elements. + * @example + * + * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]); + * // => [['a', 1, true], ['b', 2, false]] + * + * _.unzip(zipped); + * // => [['a', 'b'], [1, 2], [true, false]] + */ + function unzip(array) { + if (!(array && array.length)) { + return []; } - - function tick(elapsed) { - if (lock.active !== id) return stop(); - - var t = (elapsed - delay) / duration, - e = ease(t), - n = tweened.length; - - while (n > 0) { - tweened[--n].call(node, e); + var length = 0; + array = arrayFilter(array, function(group) { + if (isArrayLikeObject(group)) { + length = nativeMax(group.length, length); + return true; } + }); + return baseTimes(length, function(index) { + return arrayMap(array, baseProperty(index)); + }); + } - if (t >= 1) { - stop(); - event.end.call(node, d, i); - return 1; - } + /** + * This method is like `_.unzip` except that it accepts `iteratee` to specify + * how regrouped values should be combined. The iteratee is invoked with the + * elements of each group: (...group). + * + * @static + * @memberOf _ + * @since 3.8.0 + * @category Array + * @param {Array} array The array of grouped elements to process. + * @param {Function} [iteratee=_.identity] The function to combine + * regrouped values. + * @returns {Array} Returns the new array of regrouped elements. + * @example + * + * var zipped = _.zip([1, 2], [10, 20], [100, 200]); + * // => [[1, 10, 100], [2, 20, 200]] + * + * _.unzipWith(zipped, _.add); + * // => [3, 30, 300] + */ + function unzipWith(array, iteratee) { + if (!(array && array.length)) { + return []; } - - function stop() { - if (--lock.count) delete lock[id]; - else delete node.__transition__; - return 1; + var result = unzip(array); + if (iteratee == null) { + return result; } - }, 0, time); - - return transition; - } -} + return arrayMap(result, function(group) { + return apply(iteratee, undefined, group); + }); + } -d3.xhr = function(url, mimeType, callback) { - var xhr = {}, - dispatch = d3.dispatch("progress", "load", "error"), - headers = {}, - response = d3_identity, - request = new (d3_window.XDomainRequest && /^(http(s)?:)?\/\//.test(url) ? XDomainRequest : XMLHttpRequest); + /** + * Creates an array excluding all given values using + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. + * + * **Note:** Unlike `_.pull`, this method returns a new array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {...*} [values] The values to exclude. + * @returns {Array} Returns the new array of filtered values. + * @see _.difference, _.xor + * @example + * + * _.without([2, 1, 2, 3], 1, 2); + * // => [3] + */ + var without = baseRest(function(array, values) { + return isArrayLikeObject(array) + ? baseDifference(array, values) + : []; + }); - "onload" in request - ? request.onload = request.onerror = respond - : request.onreadystatechange = function() { request.readyState > 3 && respond(); }; + /** + * Creates an array of unique values that is the + * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference) + * of the given arrays. The order of result values is determined by the order + * they occur in the arrays. + * + * @static + * @memberOf _ + * @since 2.4.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @returns {Array} Returns the new array of filtered values. + * @see _.difference, _.without + * @example + * + * _.xor([2, 1], [2, 3]); + * // => [1, 3] + */ + var xor = baseRest(function(arrays) { + return baseXor(arrayFilter(arrays, isArrayLikeObject)); + }); - function respond() { - var s = request.status; - !s && request.responseText || s >= 200 && s < 300 || s === 304 - ? dispatch.load.call(xhr, response.call(xhr, request)) - : dispatch.error.call(xhr, request); - } + /** + * This method is like `_.xor` except that it accepts `iteratee` which is + * invoked for each element of each `arrays` to generate the criterion by + * which by which they're compared. The order of result values is determined + * by the order they occur in the arrays. The iteratee is invoked with one + * argument: (value). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Array} Returns the new array of filtered values. + * @example + * + * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor); + * // => [1.2, 3.4] + * + * // The `_.property` iteratee shorthand. + * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); + * // => [{ 'x': 2 }] + */ + var xorBy = baseRest(function(arrays) { + var iteratee = last(arrays); + if (isArrayLikeObject(iteratee)) { + iteratee = undefined; + } + return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2)); + }); - request.onprogress = function(event) { - var o = d3.event; - d3.event = event; - try { dispatch.progress.call(xhr, request); } - finally { d3.event = o; } - }; + /** + * This method is like `_.xor` except that it accepts `comparator` which is + * invoked to compare elements of `arrays`. The order of result values is + * determined by the order they occur in the arrays. The comparator is invoked + * with two arguments: (arrVal, othVal). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of filtered values. + * @example + * + * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; + * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; + * + * _.xorWith(objects, others, _.isEqual); + * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }] + */ + var xorWith = baseRest(function(arrays) { + var comparator = last(arrays); + comparator = typeof comparator == 'function' ? comparator : undefined; + return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator); + }); - xhr.header = function(name, value) { - name = (name + "").toLowerCase(); - if (arguments.length < 2) return headers[name]; - if (value == null) delete headers[name]; - else headers[name] = value + ""; - return xhr; - }; + /** + * Creates an array of grouped elements, the first of which contains the + * first elements of the given arrays, the second of which contains the + * second elements of the given arrays, and so on. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {...Array} [arrays] The arrays to process. + * @returns {Array} Returns the new array of grouped elements. + * @example + * + * _.zip(['a', 'b'], [1, 2], [true, false]); + * // => [['a', 1, true], ['b', 2, false]] + */ + var zip = baseRest(unzip); - // If mimeType is non-null and no Accept header is set, a default is used. - xhr.mimeType = function(value) { - if (!arguments.length) return mimeType; - mimeType = value == null ? null : value + ""; - return xhr; - }; + /** + * This method is like `_.fromPairs` except that it accepts two arrays, + * one of property identifiers and one of corresponding values. + * + * @static + * @memberOf _ + * @since 0.4.0 + * @category Array + * @param {Array} [props=[]] The property identifiers. + * @param {Array} [values=[]] The property values. + * @returns {Object} Returns the new object. + * @example + * + * _.zipObject(['a', 'b'], [1, 2]); + * // => { 'a': 1, 'b': 2 } + */ + function zipObject(props, values) { + return baseZipObject(props || [], values || [], assignValue); + } - // Specify how to convert the response content to a specific type; - // changes the callback value on "load" events. - xhr.response = function(value) { - response = value; - return xhr; - }; + /** + * This method is like `_.zipObject` except that it supports property paths. + * + * @static + * @memberOf _ + * @since 4.1.0 + * @category Array + * @param {Array} [props=[]] The property identifiers. + * @param {Array} [values=[]] The property values. + * @returns {Object} Returns the new object. + * @example + * + * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]); + * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } } + */ + function zipObjectDeep(props, values) { + return baseZipObject(props || [], values || [], baseSet); + } - // Convenience methods. - ["get", "post"].forEach(function(method) { - xhr[method] = function() { - return xhr.send.apply(xhr, [method].concat(d3_array(arguments))); - }; - }); + /** + * This method is like `_.zip` except that it accepts `iteratee` to specify + * how grouped values should be combined. The iteratee is invoked with the + * elements of each group: (...group). + * + * @static + * @memberOf _ + * @since 3.8.0 + * @category Array + * @param {...Array} [arrays] The arrays to process. + * @param {Function} [iteratee=_.identity] The function to combine + * grouped values. + * @returns {Array} Returns the new array of grouped elements. + * @example + * + * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) { + * return a + b + c; + * }); + * // => [111, 222] + */ + var zipWith = baseRest(function(arrays) { + var length = arrays.length, + iteratee = length > 1 ? arrays[length - 1] : undefined; - // If callback is non-null, it will be used for error and load events. - xhr.send = function(method, data, callback) { - if (arguments.length === 2 && typeof data === "function") callback = data, data = null; - request.open(method, url, true); - if (mimeType != null && !("accept" in headers)) headers["accept"] = mimeType + ",*/*"; - if (request.setRequestHeader) for (var name in headers) request.setRequestHeader(name, headers[name]); - if (mimeType != null && request.overrideMimeType) request.overrideMimeType(mimeType); - if (callback != null) xhr.on("error", callback).on("load", function(request) { callback(null, request); }); - request.send(data == null ? null : data); - return xhr; - }; + iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined; + return unzipWith(arrays, iteratee); + }); - xhr.abort = function() { - request.abort(); - return xhr; - }; + /*------------------------------------------------------------------------*/ - d3.rebind(xhr, dispatch, "on"); + /** + * Creates a `lodash` wrapper instance that wraps `value` with explicit method + * chain sequences enabled. The result of such sequences must be unwrapped + * with `_#value`. + * + * @static + * @memberOf _ + * @since 1.3.0 + * @category Seq + * @param {*} value The value to wrap. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36 }, + * { 'user': 'fred', 'age': 40 }, + * { 'user': 'pebbles', 'age': 1 } + * ]; + * + * var youngest = _ + * .chain(users) + * .sortBy('age') + * .map(function(o) { + * return o.user + ' is ' + o.age; + * }) + * .head() + * .value(); + * // => 'pebbles is 1' + */ + function chain(value) { + var result = lodash(value); + result.__chain__ = true; + return result; + } - if (arguments.length === 2 && typeof mimeType === "function") callback = mimeType, mimeType = null; - return callback == null ? xhr : xhr.get(d3_xhr_fixCallback(callback)); -}; + /** + * This method invokes `interceptor` and returns `value`. The interceptor + * is invoked with one argument; (value). The purpose of this method is to + * "tap into" a method chain sequence in order to modify intermediate results. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Seq + * @param {*} value The value to provide to `interceptor`. + * @param {Function} interceptor The function to invoke. + * @returns {*} Returns `value`. + * @example + * + * _([1, 2, 3]) + * .tap(function(array) { + * // Mutate input array. + * array.pop(); + * }) + * .reverse() + * .value(); + * // => [2, 1] + */ + function tap(value, interceptor) { + interceptor(value); + return value; + } -function d3_xhr_fixCallback(callback) { - return callback.length === 1 - ? function(error, request) { callback(error == null ? request : null); } - : callback; -} + /** + * This method is like `_.tap` except that it returns the result of `interceptor`. + * The purpose of this method is to "pass thru" values replacing intermediate + * results in a method chain sequence. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Seq + * @param {*} value The value to provide to `interceptor`. + * @param {Function} interceptor The function to invoke. + * @returns {*} Returns the result of `interceptor`. + * @example + * + * _(' abc ') + * .chain() + * .trim() + * .thru(function(value) { + * return [value]; + * }) + * .value(); + * // => ['abc'] + */ + function thru(value, interceptor) { + return interceptor(value); + } -d3.text = function() { - return d3.xhr.apply(d3, arguments).response(d3_text); -}; + /** + * This method is the wrapper version of `_.at`. + * + * @name at + * @memberOf _ + * @since 1.0.0 + * @category Seq + * @param {...(string|string[])} [paths] The property paths to pick. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] }; + * + * _(object).at(['a[0].b.c', 'a[1]']).value(); + * // => [3, 4] + */ + var wrapperAt = flatRest(function(paths) { + var length = paths.length, + start = length ? paths[0] : 0, + value = this.__wrapped__, + interceptor = function(object) { return baseAt(object, paths); }; + + if (length > 1 || this.__actions__.length || + !(value instanceof LazyWrapper) || !isIndex(start)) { + return this.thru(interceptor); + } + value = value.slice(start, +start + (length ? 1 : 0)); + value.__actions__.push({ + 'func': thru, + 'args': [interceptor], + 'thisArg': undefined + }); + return new LodashWrapper(value, this.__chain__).thru(function(array) { + if (length && !array.length) { + array.push(undefined); + } + return array; + }); + }); -function d3_text(request) { - return request.responseText; -} + /** + * Creates a `lodash` wrapper instance with explicit method chain sequences enabled. + * + * @name chain + * @memberOf _ + * @since 0.1.0 + * @category Seq + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36 }, + * { 'user': 'fred', 'age': 40 } + * ]; + * + * // A sequence without explicit chaining. + * _(users).head(); + * // => { 'user': 'barney', 'age': 36 } + * + * // A sequence with explicit chaining. + * _(users) + * .chain() + * .head() + * .pick('user') + * .value(); + * // => { 'user': 'barney' } + */ + function wrapperChain() { + return chain(this); + } -d3.json = function(url, callback) { - return d3.xhr(url, "application/json", callback).response(d3_json); -}; + /** + * Executes the chain sequence and returns the wrapped result. + * + * @name commit + * @memberOf _ + * @since 3.2.0 + * @category Seq + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var array = [1, 2]; + * var wrapped = _(array).push(3); + * + * console.log(array); + * // => [1, 2] + * + * wrapped = wrapped.commit(); + * console.log(array); + * // => [1, 2, 3] + * + * wrapped.last(); + * // => 3 + * + * console.log(array); + * // => [1, 2, 3] + */ + function wrapperCommit() { + return new LodashWrapper(this.value(), this.__chain__); + } -function d3_json(request) { - return JSON.parse(request.responseText); -} + /** + * Gets the next value on a wrapped object following the + * [iterator protocol](https://mdn.io/iteration_protocols#iterator). + * + * @name next + * @memberOf _ + * @since 4.0.0 + * @category Seq + * @returns {Object} Returns the next iterator value. + * @example + * + * var wrapped = _([1, 2]); + * + * wrapped.next(); + * // => { 'done': false, 'value': 1 } + * + * wrapped.next(); + * // => { 'done': false, 'value': 2 } + * + * wrapped.next(); + * // => { 'done': true, 'value': undefined } + */ + function wrapperNext() { + if (this.__values__ === undefined) { + this.__values__ = toArray(this.value()); + } + var done = this.__index__ >= this.__values__.length, + value = done ? undefined : this.__values__[this.__index__++]; -d3.html = function(url, callback) { - return d3.xhr(url, "text/html", callback).response(d3_html); -}; + return { 'done': done, 'value': value }; + } -function d3_html(request) { - var range = d3_document.createRange(); - range.selectNode(d3_document.body); - return range.createContextualFragment(request.responseText); -} - -d3.xml = function() { - return d3.xhr.apply(d3, arguments).response(d3_xml); -}; - -function d3_xml(request) { - return request.responseXML; -} - return d3; -})(); -d3.combobox = function() { - var event = d3.dispatch('accept'), - id = d3.combobox.id ++, - data = []; - - var fetcher = function(val, data, cb) { - cb(data.filter(function(d) { - return d.title - .toString() - .toLowerCase() - .indexOf(val.toLowerCase()) !== -1; - })); - }; - - var combobox = function(input) { - var idx = -1, container, shown = false; - - input - .classed('combobox-input', true) - .each(function() { - var parent = this.parentNode, - sibling = this.nextSibling; - d3.select(parent) - .insert('div', function() { return sibling; }) - .attr('class', 'combobox-carat') - .on('mousedown', function () { - // prevent the form element from blurring. it blurs - // on mousedown - d3.event.stopPropagation(); - d3.event.preventDefault(); - mousedown(); - }); - }); - - function updateSize() { - var rect = input.node().getBoundingClientRect(); - container.style({ - 'left': rect.left + 'px', - 'width': rect.width + 'px', - 'top': rect.height + rect.top + 'px' - }); - } + /** + * Enables the wrapper to be iterable. + * + * @name Symbol.iterator + * @memberOf _ + * @since 4.0.0 + * @category Seq + * @returns {Object} Returns the wrapper object. + * @example + * + * var wrapped = _([1, 2]); + * + * wrapped[Symbol.iterator]() === wrapped; + * // => true + * + * Array.from(wrapped); + * // => [1, 2] + */ + function wrapperToIterator() { + return this; + } - function blur() { - // hide the combobox whenever the input element - // loses focus - slowHide(); + /** + * Creates a clone of the chain sequence planting `value` as the wrapped value. + * + * @name plant + * @memberOf _ + * @since 3.2.0 + * @category Seq + * @param {*} value The value to plant. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * function square(n) { + * return n * n; + * } + * + * var wrapped = _([1, 2]).map(square); + * var other = wrapped.plant([3, 4]); + * + * other.value(); + * // => [9, 16] + * + * wrapped.value(); + * // => [1, 4] + */ + function wrapperPlant(value) { + var result, + parent = this; + + while (parent instanceof baseLodash) { + var clone = wrapperClone(parent); + clone.__index__ = 0; + clone.__values__ = undefined; + if (result) { + previous.__wrapped__ = clone; + } else { + result = clone; } + var previous = clone; + parent = parent.__wrapped__; + } + previous.__wrapped__ = value; + return result; + } - function show() { - if (!shown) { - container = d3.select(document.body) - .insert('div', ':first-child') - .attr('class', 'combobox') - .style({ - position: 'absolute', - display: 'block', - left: '0px' - }); - - shown = true; - } + /** + * This method is the wrapper version of `_.reverse`. + * + * **Note:** This method mutates the wrapped array. + * + * @name reverse + * @memberOf _ + * @since 0.1.0 + * @category Seq + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var array = [1, 2, 3]; + * + * _(array).reverse().value() + * // => [3, 2, 1] + * + * console.log(array); + * // => [3, 2, 1] + */ + function wrapperReverse() { + var value = this.__wrapped__; + if (value instanceof LazyWrapper) { + var wrapped = value; + if (this.__actions__.length) { + wrapped = new LazyWrapper(this); } + wrapped = wrapped.reverse(); + wrapped.__actions__.push({ + 'func': thru, + 'args': [reverse], + 'thisArg': undefined + }); + return new LodashWrapper(wrapped, this.__chain__); + } + return this.thru(reverse); + } - function hide() { - if (shown) { - idx = -1; - container.remove(); - shown = false; - } - } + /** + * Executes the chain sequence to resolve the unwrapped value. + * + * @name value + * @memberOf _ + * @since 0.1.0 + * @alias toJSON, valueOf + * @category Seq + * @returns {*} Returns the resolved unwrapped value. + * @example + * + * _([1, 2, 3]).value(); + * // => [1, 2, 3] + */ + function wrapperValue() { + return baseWrapperValue(this.__wrapped__, this.__actions__); + } - function slowHide() { - window.setTimeout(hide, 150); - } - function keydown() { - if (!shown) return; - switch (d3.event.keyCode) { - // down arrow - case 40: - next(); - d3.event.preventDefault(); - break; - // up arrow - case 38: - prev(); - d3.event.preventDefault(); - break; - // escape, tab - case 13: - d3.event.preventDefault(); - break; - } - d3.event.stopPropagation(); - } + /*------------------------------------------------------------------------*/ - function keyup() { - switch (d3.event.keyCode) { - // escape - case 27: - hide(); - break; - // escape, tab - case 9: - case 13: - if (!shown) return; - accept(); - break; - default: - update(); - d3.event.preventDefault(); - } - d3.event.stopPropagation(); - } + /** + * Creates an object composed of keys generated from the results of running + * each element of `collection` thru `iteratee`. The corresponding value of + * each key is the number of times the key was returned by `iteratee`. The + * iteratee is invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 0.5.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The iteratee to transform keys. + * @returns {Object} Returns the composed aggregate object. + * @example + * + * _.countBy([6.1, 4.2, 6.3], Math.floor); + * // => { '4': 1, '6': 2 } + * + * // The `_.property` iteratee shorthand. + * _.countBy(['one', 'two', 'three'], 'length'); + * // => { '3': 2, '5': 1 } + */ + var countBy = createAggregator(function(result, value, key) { + if (hasOwnProperty.call(result, key)) { + ++result[key]; + } else { + baseAssignValue(result, key, 1); + } + }); - function accept() { - if (container.select('a.selected').node()) { - select(container.select('a.selected').datum()); - } - hide(); - } + /** + * Checks if `predicate` returns truthy for **all** elements of `collection`. + * Iteration is stopped once `predicate` returns falsey. The predicate is + * invoked with three arguments: (value, index|key, collection). + * + * **Note:** This method returns `true` for + * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because + * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of + * elements of empty collections. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {boolean} Returns `true` if all elements pass the predicate check, + * else `false`. + * @example + * + * _.every([true, 1, null, 'yes'], Boolean); + * // => false + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': false }, + * { 'user': 'fred', 'age': 40, 'active': false } + * ]; + * + * // The `_.matches` iteratee shorthand. + * _.every(users, { 'user': 'barney', 'active': false }); + * // => false + * + * // The `_.matchesProperty` iteratee shorthand. + * _.every(users, ['active', false]); + * // => true + * + * // The `_.property` iteratee shorthand. + * _.every(users, 'active'); + * // => false + */ + function every(collection, predicate, guard) { + var func = isArray(collection) ? arrayEvery : baseEvery; + if (guard && isIterateeCall(collection, predicate, guard)) { + predicate = undefined; + } + return func(collection, getIteratee(predicate, 3)); + } - function next() { - var len = container.selectAll('a').data().length; - idx = Math.min(idx + 1, len - 1); - highlight(); - } + /** + * Iterates over elements of `collection`, returning an array of all elements + * `predicate` returns truthy for. The predicate is invoked with three + * arguments: (value, index|key, collection). + * + * **Note:** Unlike `_.remove`, this method returns a new array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + * @see _.reject + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': true }, + * { 'user': 'fred', 'age': 40, 'active': false } + * ]; + * + * _.filter(users, function(o) { return !o.active; }); + * // => objects for ['fred'] + * + * // The `_.matches` iteratee shorthand. + * _.filter(users, { 'age': 36, 'active': true }); + * // => objects for ['barney'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.filter(users, ['active', false]); + * // => objects for ['fred'] + * + * // The `_.property` iteratee shorthand. + * _.filter(users, 'active'); + * // => objects for ['barney'] + */ + function filter(collection, predicate) { + var func = isArray(collection) ? arrayFilter : baseFilter; + return func(collection, getIteratee(predicate, 3)); + } - function prev() { - idx = Math.max(idx - 1, 0); - highlight(); - } + /** + * Iterates over elements of `collection`, returning the first element + * `predicate` returns truthy for. The predicate is invoked with three + * arguments: (value, index|key, collection). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @param {number} [fromIndex=0] The index to search from. + * @returns {*} Returns the matched element, else `undefined`. + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': true }, + * { 'user': 'fred', 'age': 40, 'active': false }, + * { 'user': 'pebbles', 'age': 1, 'active': true } + * ]; + * + * _.find(users, function(o) { return o.age < 40; }); + * // => object for 'barney' + * + * // The `_.matches` iteratee shorthand. + * _.find(users, { 'age': 1, 'active': true }); + * // => object for 'pebbles' + * + * // The `_.matchesProperty` iteratee shorthand. + * _.find(users, ['active', false]); + * // => object for 'fred' + * + * // The `_.property` iteratee shorthand. + * _.find(users, 'active'); + * // => object for 'barney' + */ + var find = createFind(findIndex); - var prevValue, prevCompletion; + /** + * This method is like `_.find` except that it iterates over elements of + * `collection` from right to left. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Collection + * @param {Array|Object} collection The collection to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @param {number} [fromIndex=collection.length-1] The index to search from. + * @returns {*} Returns the matched element, else `undefined`. + * @example + * + * _.findLast([1, 2, 3, 4], function(n) { + * return n % 2 == 1; + * }); + * // => 3 + */ + var findLast = createFind(findLastIndex); - function autocomplete(e, data) { + /** + * Creates a flattened array of values by running each element in `collection` + * thru `iteratee` and flattening the mapped results. The iteratee is invoked + * with three arguments: (value, index|key, collection). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new flattened array. + * @example + * + * function duplicate(n) { + * return [n, n]; + * } + * + * _.flatMap([1, 2], duplicate); + * // => [1, 1, 2, 2] + */ + function flatMap(collection, iteratee) { + return baseFlatten(map(collection, iteratee), 1); + } - var value = input.property('value'), - match; + /** + * This method is like `_.flatMap` except that it recursively flattens the + * mapped results. + * + * @static + * @memberOf _ + * @since 4.7.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new flattened array. + * @example + * + * function duplicate(n) { + * return [[[n, n]]]; + * } + * + * _.flatMapDeep([1, 2], duplicate); + * // => [1, 1, 2, 2] + */ + function flatMapDeep(collection, iteratee) { + return baseFlatten(map(collection, iteratee), INFINITY); + } - for (var i = 0; i < data.length; i++) { - if (data[i].value.toLowerCase().indexOf(value.toLowerCase()) === 0) { - match = data[i].value; - break; - } - } + /** + * This method is like `_.flatMap` except that it recursively flattens the + * mapped results up to `depth` times. + * + * @static + * @memberOf _ + * @since 4.7.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @param {number} [depth=1] The maximum recursion depth. + * @returns {Array} Returns the new flattened array. + * @example + * + * function duplicate(n) { + * return [[[n, n]]]; + * } + * + * _.flatMapDepth([1, 2], duplicate, 2); + * // => [[1, 1], [2, 2]] + */ + function flatMapDepth(collection, iteratee, depth) { + depth = depth === undefined ? 1 : toInteger(depth); + return baseFlatten(map(collection, iteratee), depth); + } - // backspace - if (e.keyCode === 8) { - prevValue = value; - prevCompletion = ''; + /** + * Iterates over elements of `collection` and invokes `iteratee` for each element. + * The iteratee is invoked with three arguments: (value, index|key, collection). + * Iteratee functions may exit iteration early by explicitly returning `false`. + * + * **Note:** As with other "Collections" methods, objects with a "length" + * property are iterated like arrays. To avoid this behavior use `_.forIn` + * or `_.forOwn` for object iteration. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @alias each + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Array|Object} Returns `collection`. + * @see _.forEachRight + * @example + * + * _.forEach([1, 2], function(value) { + * console.log(value); + * }); + * // => Logs `1` then `2`. + * + * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) { + * console.log(key); + * }); + * // => Logs 'a' then 'b' (iteration order is not guaranteed). + */ + function forEach(collection, iteratee) { + var func = isArray(collection) ? arrayEach : baseEach; + return func(collection, getIteratee(iteratee, 3)); + } - } else if (value && match && value !== prevValue + prevCompletion) { - prevValue = value; - prevCompletion = match.substr(value.length); - input.property('value', prevValue + prevCompletion); - input.node().setSelectionRange(value.length, value.length + prevCompletion.length); - } - } + /** + * This method is like `_.forEach` except that it iterates over elements of + * `collection` from right to left. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @alias eachRight + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Array|Object} Returns `collection`. + * @see _.forEach + * @example + * + * _.forEachRight([1, 2], function(value) { + * console.log(value); + * }); + * // => Logs `2` then `1`. + */ + function forEachRight(collection, iteratee) { + var func = isArray(collection) ? arrayEachRight : baseEachRight; + return func(collection, getIteratee(iteratee, 3)); + } + /** + * Creates an object composed of keys generated from the results of running + * each element of `collection` thru `iteratee`. The order of grouped values + * is determined by the order they occur in `collection`. The corresponding + * value of each key is an array of elements responsible for generating the + * key. The iteratee is invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The iteratee to transform keys. + * @returns {Object} Returns the composed aggregate object. + * @example + * + * _.groupBy([6.1, 4.2, 6.3], Math.floor); + * // => { '4': [4.2], '6': [6.1, 6.3] } + * + * // The `_.property` iteratee shorthand. + * _.groupBy(['one', 'two', 'three'], 'length'); + * // => { '3': ['one', 'two'], '5': ['three'] } + */ + var groupBy = createAggregator(function(result, value, key) { + if (hasOwnProperty.call(result, key)) { + result[key].push(value); + } else { + baseAssignValue(result, key, [value]); + } + }); - function highlight() { - container - .selectAll('a') - .classed('selected', function(d, i) { return i == idx; }); - var height = container.node().offsetHeight, - top = container.select('a.selected').node().offsetTop, - selectedHeight = container.select('a.selected').node().offsetHeight; - if ((top + selectedHeight) < height) { - container.node().scrollTop = 0; - } else { - container.node().scrollTop = top; - } - } + /** + * Checks if `value` is in `collection`. If `collection` is a string, it's + * checked for a substring of `value`, otherwise + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * is used for equality comparisons. If `fromIndex` is negative, it's used as + * the offset from the end of `collection`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object|string} collection The collection to inspect. + * @param {*} value The value to search for. + * @param {number} [fromIndex=0] The index to search from. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`. + * @returns {boolean} Returns `true` if `value` is found, else `false`. + * @example + * + * _.includes([1, 2, 3], 1); + * // => true + * + * _.includes([1, 2, 3], 1, 2); + * // => false + * + * _.includes({ 'a': 1, 'b': 2 }, 1); + * // => true + * + * _.includes('abcd', 'bc'); + * // => true + */ + function includes(collection, value, fromIndex, guard) { + collection = isArrayLike(collection) ? collection : values(collection); + fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0; - function update(value) { + var length = collection.length; + if (fromIndex < 0) { + fromIndex = nativeMax(length + fromIndex, 0); + } + return isString(collection) + ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1) + : (!!length && baseIndexOf(collection, value, fromIndex) > -1); + } - if (typeof value === 'undefined') { - value = input.property('value'); - } + /** + * Invokes the method at `path` of each element in `collection`, returning + * an array of the results of each invoked method. Any additional arguments + * are provided to each invoked method. If `path` is a function, it's invoked + * for, and `this` bound to, each element in `collection`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Array|Function|string} path The path of the method to invoke or + * the function invoked per iteration. + * @param {...*} [args] The arguments to invoke each method with. + * @returns {Array} Returns the array of results. + * @example + * + * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort'); + * // => [[1, 5, 7], [1, 2, 3]] + * + * _.invokeMap([123, 456], String.prototype.split, ''); + * // => [['1', '2', '3'], ['4', '5', '6']] + */ + var invokeMap = baseRest(function(collection, path, args) { + var index = -1, + isFunc = typeof path == 'function', + result = isArrayLike(collection) ? Array(collection.length) : []; - var e = d3.event; + baseEach(collection, function(value) { + result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args); + }); + return result; + }); - function render(data) { + /** + * Creates an object composed of keys generated from the results of running + * each element of `collection` thru `iteratee`. The corresponding value of + * each key is the last element responsible for generating the key. The + * iteratee is invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The iteratee to transform keys. + * @returns {Object} Returns the composed aggregate object. + * @example + * + * var array = [ + * { 'dir': 'left', 'code': 97 }, + * { 'dir': 'right', 'code': 100 } + * ]; + * + * _.keyBy(array, function(o) { + * return String.fromCharCode(o.code); + * }); + * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } + * + * _.keyBy(array, 'dir'); + * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } } + */ + var keyBy = createAggregator(function(result, value, key) { + baseAssignValue(result, key, value); + }); - if (data.length && - document.activeElement === input.node()) show(); - else return hide(); + /** + * Creates an array of values by running each element in `collection` thru + * `iteratee`. The iteratee is invoked with three arguments: + * (value, index|key, collection). + * + * Many lodash methods are guarded to work as iteratees for methods like + * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`. + * + * The guarded methods are: + * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`, + * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`, + * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`, + * `template`, `trim`, `trimEnd`, `trimStart`, and `words` + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new mapped array. + * @example + * + * function square(n) { + * return n * n; + * } + * + * _.map([4, 8], square); + * // => [16, 64] + * + * _.map({ 'a': 4, 'b': 8 }, square); + * // => [16, 64] (iteration order is not guaranteed) + * + * var users = [ + * { 'user': 'barney' }, + * { 'user': 'fred' } + * ]; + * + * // The `_.property` iteratee shorthand. + * _.map(users, 'user'); + * // => ['barney', 'fred'] + */ + function map(collection, iteratee) { + var func = isArray(collection) ? arrayMap : baseMap; + return func(collection, getIteratee(iteratee, 3)); + } - autocomplete(e, data); + /** + * This method is like `_.sortBy` except that it allows specifying the sort + * orders of the iteratees to sort by. If `orders` is unspecified, all values + * are sorted in ascending order. Otherwise, specify an order of "desc" for + * descending or "asc" for ascending sort order of corresponding values. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]] + * The iteratees to sort by. + * @param {string[]} [orders] The sort orders of `iteratees`. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`. + * @returns {Array} Returns the new sorted array. + * @example + * + * var users = [ + * { 'user': 'fred', 'age': 48 }, + * { 'user': 'barney', 'age': 34 }, + * { 'user': 'fred', 'age': 40 }, + * { 'user': 'barney', 'age': 36 } + * ]; + * + * // Sort by `user` in ascending order and by `age` in descending order. + * _.orderBy(users, ['user', 'age'], ['asc', 'desc']); + * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]] + */ + function orderBy(collection, iteratees, orders, guard) { + if (collection == null) { + return []; + } + if (!isArray(iteratees)) { + iteratees = iteratees == null ? [] : [iteratees]; + } + orders = guard ? undefined : orders; + if (!isArray(orders)) { + orders = orders == null ? [] : [orders]; + } + return baseOrderBy(collection, iteratees, orders); + } - updateSize(); + /** + * Creates an array of elements split into two groups, the first of which + * contains elements `predicate` returns truthy for, the second of which + * contains elements `predicate` returns falsey for. The predicate is + * invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the array of grouped elements. + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': false }, + * { 'user': 'fred', 'age': 40, 'active': true }, + * { 'user': 'pebbles', 'age': 1, 'active': false } + * ]; + * + * _.partition(users, function(o) { return o.active; }); + * // => objects for [['fred'], ['barney', 'pebbles']] + * + * // The `_.matches` iteratee shorthand. + * _.partition(users, { 'age': 1, 'active': false }); + * // => objects for [['pebbles'], ['barney', 'fred']] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.partition(users, ['active', false]); + * // => objects for [['barney', 'pebbles'], ['fred']] + * + * // The `_.property` iteratee shorthand. + * _.partition(users, 'active'); + * // => objects for [['fred'], ['barney', 'pebbles']] + */ + var partition = createAggregator(function(result, value, key) { + result[key ? 0 : 1].push(value); + }, function() { return [[], []]; }); - var options = container - .selectAll('a.combobox-option') - .data(data, function(d) { return d.value; }); + /** + * Reduces `collection` to a value which is the accumulated result of running + * each element in `collection` thru `iteratee`, where each successive + * invocation is supplied the return value of the previous. If `accumulator` + * is not given, the first element of `collection` is used as the initial + * value. The iteratee is invoked with four arguments: + * (accumulator, value, index|key, collection). + * + * Many lodash methods are guarded to work as iteratees for methods like + * `_.reduce`, `_.reduceRight`, and `_.transform`. + * + * The guarded methods are: + * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`, + * and `sortBy` + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @param {*} [accumulator] The initial value. + * @returns {*} Returns the accumulated value. + * @see _.reduceRight + * @example + * + * _.reduce([1, 2], function(sum, n) { + * return sum + n; + * }, 0); + * // => 3 + * + * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { + * (result[value] || (result[value] = [])).push(key); + * return result; + * }, {}); + * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed) + */ + function reduce(collection, iteratee, accumulator) { + var func = isArray(collection) ? arrayReduce : baseReduce, + initAccum = arguments.length < 3; - options.enter() - .append('a') - .text(function(d) { return d.value; }) - .attr('class', 'combobox-option') - .attr('title', function(d) { return d.title; }) - .on('click', select); + return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach); + } - options.exit().remove(); + /** + * This method is like `_.reduce` except that it iterates over elements of + * `collection` from right to left. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @param {*} [accumulator] The initial value. + * @returns {*} Returns the accumulated value. + * @see _.reduce + * @example + * + * var array = [[0, 1], [2, 3], [4, 5]]; + * + * _.reduceRight(array, function(flattened, other) { + * return flattened.concat(other); + * }, []); + * // => [4, 5, 2, 3, 0, 1] + */ + function reduceRight(collection, iteratee, accumulator) { + var func = isArray(collection) ? arrayReduceRight : baseReduce, + initAccum = arguments.length < 3; - options - .classed('selected', function(d, i) { return i == idx; }) - .order(); - } + return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight); + } - fetcher.apply(input, [value, data, render]); - } + /** + * The opposite of `_.filter`; this method returns the elements of `collection` + * that `predicate` does **not** return truthy for. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + * @see _.filter + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': false }, + * { 'user': 'fred', 'age': 40, 'active': true } + * ]; + * + * _.reject(users, function(o) { return !o.active; }); + * // => objects for ['fred'] + * + * // The `_.matches` iteratee shorthand. + * _.reject(users, { 'age': 40, 'active': true }); + * // => objects for ['barney'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.reject(users, ['active', false]); + * // => objects for ['fred'] + * + * // The `_.property` iteratee shorthand. + * _.reject(users, 'active'); + * // => objects for ['barney'] + */ + function reject(collection, predicate) { + var func = isArray(collection) ? arrayFilter : baseFilter; + return func(collection, negate(getIteratee(predicate, 3))); + } - // select the choice given as d - function select(d) { - input - .property('value', d.value) - .trigger('change'); - event.accept(d); - hide(); - } + /** + * Gets a random element from `collection`. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Collection + * @param {Array|Object} collection The collection to sample. + * @returns {*} Returns the random element. + * @example + * + * _.sample([1, 2, 3, 4]); + * // => 2 + */ + function sample(collection) { + var func = isArray(collection) ? arraySample : baseSample; + return func(collection); + } - function mousedown() { + /** + * Gets `n` random elements at unique keys from `collection` up to the + * size of `collection`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Collection + * @param {Array|Object} collection The collection to sample. + * @param {number} [n=1] The number of elements to sample. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Array} Returns the random elements. + * @example + * + * _.sampleSize([1, 2, 3], 2); + * // => [3, 1] + * + * _.sampleSize([1, 2, 3], 4); + * // => [2, 3, 1] + */ + function sampleSize(collection, n, guard) { + if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) { + n = 1; + } else { + n = toInteger(n); + } + var func = isArray(collection) ? arraySampleSize : baseSampleSize; + return func(collection, n); + } - if (shown) return hide(); + /** + * Creates an array of shuffled values, using a version of the + * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to shuffle. + * @returns {Array} Returns the new shuffled array. + * @example + * + * _.shuffle([1, 2, 3, 4]); + * // => [4, 1, 3, 2] + */ + function shuffle(collection) { + var func = isArray(collection) ? arrayShuffle : baseShuffle; + return func(collection); + } - input.node().focus(); - update(''); + /** + * Gets the size of `collection` by returning its length for array-like + * values or the number of own enumerable string keyed properties for objects. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object|string} collection The collection to inspect. + * @returns {number} Returns the collection size. + * @example + * + * _.size([1, 2, 3]); + * // => 3 + * + * _.size({ 'a': 1, 'b': 2 }); + * // => 2 + * + * _.size('pebbles'); + * // => 7 + */ + function size(collection) { + if (collection == null) { + return 0; + } + if (isArrayLike(collection)) { + return isString(collection) ? stringSize(collection) : collection.length; + } + var tag = getTag(collection); + if (tag == mapTag || tag == setTag) { + return collection.size; + } + return baseKeys(collection).length; + } - if (!container) return; + /** + * Checks if `predicate` returns truthy for **any** element of `collection`. + * Iteration is stopped once `predicate` returns truthy. The predicate is + * invoked with three arguments: (value, index|key, collection). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {boolean} Returns `true` if any element passes the predicate check, + * else `false`. + * @example + * + * _.some([null, 0, 'yes', false], Boolean); + * // => true + * + * var users = [ + * { 'user': 'barney', 'active': true }, + * { 'user': 'fred', 'active': false } + * ]; + * + * // The `_.matches` iteratee shorthand. + * _.some(users, { 'user': 'barney', 'active': false }); + * // => false + * + * // The `_.matchesProperty` iteratee shorthand. + * _.some(users, ['active', false]); + * // => true + * + * // The `_.property` iteratee shorthand. + * _.some(users, 'active'); + * // => true + */ + function some(collection, predicate, guard) { + var func = isArray(collection) ? arraySome : baseSome; + if (guard && isIterateeCall(collection, predicate, guard)) { + predicate = undefined; + } + return func(collection, getIteratee(predicate, 3)); + } - var entries = container.selectAll('a'), - height = container.node().scrollHeight / entries[0].length, - w = d3.select(window); + /** + * Creates an array of elements, sorted in ascending order by the results of + * running each element in a collection thru each iteratee. This method + * performs a stable sort, that is, it preserves the original sort order of + * equal elements. The iteratees are invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {...(Function|Function[])} [iteratees=[_.identity]] + * The iteratees to sort by. + * @returns {Array} Returns the new sorted array. + * @example + * + * var users = [ + * { 'user': 'fred', 'age': 48 }, + * { 'user': 'barney', 'age': 36 }, + * { 'user': 'fred', 'age': 40 }, + * { 'user': 'barney', 'age': 34 } + * ]; + * + * _.sortBy(users, [function(o) { return o.user; }]); + * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]] + * + * _.sortBy(users, ['user', 'age']); + * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]] + */ + var sortBy = baseRest(function(collection, iteratees) { + if (collection == null) { + return []; + } + var length = iteratees.length; + if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) { + iteratees = []; + } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) { + iteratees = [iteratees[0]]; + } + return baseOrderBy(collection, baseFlatten(iteratees, 1), []); + }); - function getIndex(m) { - return Math.floor((m[1] + container.node().scrollTop) / height); - } + /*------------------------------------------------------------------------*/ - function withinBounds(m) { - var n = container.node(); - return m[0] >= 0 && m[0] < n.offsetWidth && - m[1] >= 0 && m[1] < n.offsetHeight; - } + /** + * Gets the timestamp of the number of milliseconds that have elapsed since + * the Unix epoch (1 January 1970 00:00:00 UTC). + * + * @static + * @memberOf _ + * @since 2.4.0 + * @category Date + * @returns {number} Returns the timestamp. + * @example + * + * _.defer(function(stamp) { + * console.log(_.now() - stamp); + * }, _.now()); + * // => Logs the number of milliseconds it took for the deferred invocation. + */ + var now = ctxNow || function() { + return root.Date.now(); + }; - w.on('mousemove.typeahead', function() { - var m = d3.mouse(container.node()); - var within = withinBounds(m); - var n = getIndex(m); - entries.classed('selected', function(d, i) { return within && i === n; }); - }); + /*------------------------------------------------------------------------*/ - w.on('mouseup.typeahead', function() { - var m = d3.mouse(container.node()); - if (withinBounds(m)) select(d3.select(entries[0][getIndex(m)]).datum()); - entries.classed('selected', false); - w.on('mouseup.typeahead', null); - w.on('mousemove.typeahead', null); - }); + /** + * The opposite of `_.before`; this method creates a function that invokes + * `func` once it's called `n` or more times. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {number} n The number of calls before `func` is invoked. + * @param {Function} func The function to restrict. + * @returns {Function} Returns the new restricted function. + * @example + * + * var saves = ['profile', 'settings']; + * + * var done = _.after(saves.length, function() { + * console.log('done saving!'); + * }); + * + * _.forEach(saves, function(type) { + * asyncSave({ 'type': type, 'complete': done }); + * }); + * // => Logs 'done saving!' after the two async saves have completed. + */ + function after(n, func) { + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + n = toInteger(n); + return function() { + if (--n < 1) { + return func.apply(this, arguments); } + }; + } - input - .on('blur.typeahead', blur) - .on('keydown.typeahead', keydown) - .on('keyup.typeahead', keyup) - .on('mousedown.typeahead', mousedown); + /** + * Creates a function that invokes `func`, with up to `n` arguments, + * ignoring any additional arguments. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Function + * @param {Function} func The function to cap arguments for. + * @param {number} [n=func.length] The arity cap. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Function} Returns the new capped function. + * @example + * + * _.map(['6', '8', '10'], _.ary(parseInt, 1)); + * // => [6, 8, 10] + */ + function ary(func, n, guard) { + n = guard ? undefined : n; + n = (func && n == null) ? func.length : n; + return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n); + } - d3.select(document.body).on('scroll.combo' + id, function() { - if (shown) updateSize(); - }, true); - }; + /** + * Creates a function that invokes `func`, with the `this` binding and arguments + * of the created function, while it's called less than `n` times. Subsequent + * calls to the created function return the result of the last `func` invocation. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Function + * @param {number} n The number of calls at which `func` is no longer invoked. + * @param {Function} func The function to restrict. + * @returns {Function} Returns the new restricted function. + * @example + * + * jQuery(element).on('click', _.before(5, addContactToList)); + * // => Allows adding up to 4 contacts to the list. + */ + function before(n, func) { + var result; + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + n = toInteger(n); + return function() { + if (--n > 0) { + result = func.apply(this, arguments); + } + if (n <= 1) { + func = undefined; + } + return result; + }; + } - combobox.fetcher = function(_) { - if (!arguments.length) return fetcher; - fetcher = _; - return combobox; - }; + /** + * Creates a function that invokes `func` with the `this` binding of `thisArg` + * and `partials` prepended to the arguments it receives. + * + * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds, + * may be used as a placeholder for partially applied arguments. + * + * **Note:** Unlike native `Function#bind`, this method doesn't set the "length" + * property of bound functions. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to bind. + * @param {*} thisArg The `this` binding of `func`. + * @param {...*} [partials] The arguments to be partially applied. + * @returns {Function} Returns the new bound function. + * @example + * + * function greet(greeting, punctuation) { + * return greeting + ' ' + this.user + punctuation; + * } + * + * var object = { 'user': 'fred' }; + * + * var bound = _.bind(greet, object, 'hi'); + * bound('!'); + * // => 'hi fred!' + * + * // Bound with placeholders. + * var bound = _.bind(greet, object, _, '!'); + * bound('hi'); + * // => 'hi fred!' + */ + var bind = baseRest(function(func, thisArg, partials) { + var bitmask = WRAP_BIND_FLAG; + if (partials.length) { + var holders = replaceHolders(partials, getHolder(bind)); + bitmask |= WRAP_PARTIAL_FLAG; + } + return createWrap(func, bitmask, thisArg, partials, holders); + }); - combobox.data = function(_) { - if (!arguments.length) return data; - data = _; - return combobox; - }; + /** + * Creates a function that invokes the method at `object[key]` with `partials` + * prepended to the arguments it receives. + * + * This method differs from `_.bind` by allowing bound functions to reference + * methods that may be redefined or don't yet exist. See + * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern) + * for more details. + * + * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic + * builds, may be used as a placeholder for partially applied arguments. + * + * @static + * @memberOf _ + * @since 0.10.0 + * @category Function + * @param {Object} object The object to invoke the method on. + * @param {string} key The key of the method. + * @param {...*} [partials] The arguments to be partially applied. + * @returns {Function} Returns the new bound function. + * @example + * + * var object = { + * 'user': 'fred', + * 'greet': function(greeting, punctuation) { + * return greeting + ' ' + this.user + punctuation; + * } + * }; + * + * var bound = _.bindKey(object, 'greet', 'hi'); + * bound('!'); + * // => 'hi fred!' + * + * object.greet = function(greeting, punctuation) { + * return greeting + 'ya ' + this.user + punctuation; + * }; + * + * bound('!'); + * // => 'hiya fred!' + * + * // Bound with placeholders. + * var bound = _.bindKey(object, 'greet', _, '!'); + * bound('hi'); + * // => 'hiya fred!' + */ + var bindKey = baseRest(function(object, key, partials) { + var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG; + if (partials.length) { + var holders = replaceHolders(partials, getHolder(bindKey)); + bitmask |= WRAP_PARTIAL_FLAG; + } + return createWrap(key, bitmask, object, partials, holders); + }); - return d3.rebind(combobox, event, 'on'); -}; + /** + * Creates a function that accepts arguments of `func` and either invokes + * `func` returning its result, if at least `arity` number of arguments have + * been provided, or returns a function that accepts the remaining `func` + * arguments, and so on. The arity of `func` may be specified if `func.length` + * is not sufficient. + * + * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds, + * may be used as a placeholder for provided arguments. + * + * **Note:** This method doesn't set the "length" property of curried functions. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Function + * @param {Function} func The function to curry. + * @param {number} [arity=func.length] The arity of `func`. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Function} Returns the new curried function. + * @example + * + * var abc = function(a, b, c) { + * return [a, b, c]; + * }; + * + * var curried = _.curry(abc); + * + * curried(1)(2)(3); + * // => [1, 2, 3] + * + * curried(1, 2)(3); + * // => [1, 2, 3] + * + * curried(1, 2, 3); + * // => [1, 2, 3] + * + * // Curried with placeholders. + * curried(1)(_, 3)(2); + * // => [1, 2, 3] + */ + function curry(func, arity, guard) { + arity = guard ? undefined : arity; + var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity); + result.placeholder = curry.placeholder; + return result; + } -d3.combobox.id = 0; -d3.geo.tile = function() { - var size = [960, 500], - scale = 256, - scaleExtent = [0, 20], - translate = [size[0] / 2, size[1] / 2], - zoomDelta = 0; + /** + * This method is like `_.curry` except that arguments are applied to `func` + * in the manner of `_.partialRight` instead of `_.partial`. + * + * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic + * builds, may be used as a placeholder for provided arguments. + * + * **Note:** This method doesn't set the "length" property of curried functions. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Function + * @param {Function} func The function to curry. + * @param {number} [arity=func.length] The arity of `func`. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Function} Returns the new curried function. + * @example + * + * var abc = function(a, b, c) { + * return [a, b, c]; + * }; + * + * var curried = _.curryRight(abc); + * + * curried(3)(2)(1); + * // => [1, 2, 3] + * + * curried(2, 3)(1); + * // => [1, 2, 3] + * + * curried(1, 2, 3); + * // => [1, 2, 3] + * + * // Curried with placeholders. + * curried(3)(1, _)(2); + * // => [1, 2, 3] + */ + function curryRight(func, arity, guard) { + arity = guard ? undefined : arity; + var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity); + result.placeholder = curryRight.placeholder; + return result; + } - function bound(_) { - return Math.min(scaleExtent[1], Math.max(scaleExtent[0], _)); - } + /** + * Creates a debounced function that delays invoking `func` until after `wait` + * milliseconds have elapsed since the last time the debounced function was + * invoked. The debounced function comes with a `cancel` method to cancel + * delayed `func` invocations and a `flush` method to immediately invoke them. + * Provide `options` to indicate whether `func` should be invoked on the + * leading and/or trailing edge of the `wait` timeout. The `func` is invoked + * with the last arguments provided to the debounced function. Subsequent + * calls to the debounced function return the result of the last `func` + * invocation. + * + * **Note:** If `leading` and `trailing` options are `true`, `func` is + * invoked on the trailing edge of the timeout only if the debounced function + * is invoked more than once during the `wait` timeout. + * + * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred + * until to the next tick, similar to `setTimeout` with a timeout of `0`. + * + * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/) + * for details over the differences between `_.debounce` and `_.throttle`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to debounce. + * @param {number} [wait=0] The number of milliseconds to delay. + * @param {Object} [options={}] The options object. + * @param {boolean} [options.leading=false] + * Specify invoking on the leading edge of the timeout. + * @param {number} [options.maxWait] + * The maximum time `func` is allowed to be delayed before it's invoked. + * @param {boolean} [options.trailing=true] + * Specify invoking on the trailing edge of the timeout. + * @returns {Function} Returns the new debounced function. + * @example + * + * // Avoid costly calculations while the window size is in flux. + * jQuery(window).on('resize', _.debounce(calculateLayout, 150)); + * + * // Invoke `sendMail` when clicked, debouncing subsequent calls. + * jQuery(element).on('click', _.debounce(sendMail, 300, { + * 'leading': true, + * 'trailing': false + * })); + * + * // Ensure `batchLog` is invoked once after 1 second of debounced calls. + * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 }); + * var source = new EventSource('/stream'); + * jQuery(source).on('message', debounced); + * + * // Cancel the trailing debounced invocation. + * jQuery(window).on('popstate', debounced.cancel); + */ + function debounce(func, wait, options) { + var lastArgs, + lastThis, + maxWait, + result, + timerId, + lastCallTime, + lastInvokeTime = 0, + leading = false, + maxing = false, + trailing = true; + + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + wait = toNumber(wait) || 0; + if (isObject(options)) { + leading = !!options.leading; + maxing = 'maxWait' in options; + maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait; + trailing = 'trailing' in options ? !!options.trailing : trailing; + } - function tile() { - var z = Math.max(Math.log(scale) / Math.LN2 - 8, 0), - z0 = bound(Math.round(z + zoomDelta)), - k = Math.pow(2, z - z0 + 8), - origin = [(translate[0] - scale / 2) / k, (translate[1] - scale / 2) / k], - tiles = [], - cols = d3.range(Math.max(0, Math.floor(-origin[0])), Math.max(0, Math.ceil(size[0] / k - origin[0]))), - rows = d3.range(Math.max(0, Math.floor(-origin[1])), Math.max(0, Math.ceil(size[1] / k - origin[1]))); + function invokeFunc(time) { + var args = lastArgs, + thisArg = lastThis; - rows.forEach(function(y) { - cols.forEach(function(x) { - tiles.push([x, y, z0]); - }); - }); + lastArgs = lastThis = undefined; + lastInvokeTime = time; + result = func.apply(thisArg, args); + return result; + } - tiles.translate = origin; - tiles.scale = k; + function leadingEdge(time) { + // Reset any `maxWait` timer. + lastInvokeTime = time; + // Start the timer for the trailing edge. + timerId = setTimeout(timerExpired, wait); + // Invoke the leading edge. + return leading ? invokeFunc(time) : result; + } - return tiles; - } + function remainingWait(time) { + var timeSinceLastCall = time - lastCallTime, + timeSinceLastInvoke = time - lastInvokeTime, + result = wait - timeSinceLastCall; - tile.scaleExtent = function(_) { - if (!arguments.length) return scaleExtent; - scaleExtent = _; - return tile; - }; + return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result; + } - tile.size = function(_) { - if (!arguments.length) return size; - size = _; - return tile; - }; + function shouldInvoke(time) { + var timeSinceLastCall = time - lastCallTime, + timeSinceLastInvoke = time - lastInvokeTime; - tile.scale = function(_) { - if (!arguments.length) return scale; - scale = _; - return tile; - }; - - tile.translate = function(_) { - if (!arguments.length) return translate; - translate = _; - return tile; - }; - - tile.zoomDelta = function(_) { - if (!arguments.length) return zoomDelta; - zoomDelta = +_; - return tile; - }; - - return tile; -}; -d3.jsonp = function (url, callback) { - function rand() { - var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz', - c = '', i = -1; - while (++i < 15) c += chars.charAt(Math.floor(Math.random() * 52)); - return c; - } - - function create(url) { - var e = url.match(/callback=d3.jsonp.(\w+)/), - c = e ? e[1] : rand(); - d3.jsonp[c] = function(data) { - callback(data); - delete d3.jsonp[c]; - script.remove(); - }; - return 'd3.jsonp.' + c; - } - - var cb = create(url), - script = d3.select('head') - .append('script') - .attr('type', 'text/javascript') - .attr('src', url.replace(/(\{|%7B)callback(\}|%7D)/, cb)); -}; -/* - * This code is licensed under the MIT license. - * - * Copyright © 2013, iD authors. - * - * Portions copyright © 2011, Keith Cirkel - * See https://github.com/keithamus/jwerty - * - */ -d3.keybinding = function(namespace) { - var bindings = []; + // Either this is the first call, activity has stopped and we're at the + // trailing edge, the system time has gone backwards and we're treating + // it as the trailing edge, or we've hit the `maxWait` limit. + return (lastCallTime === undefined || (timeSinceLastCall >= wait) || + (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait)); + } - function matches(binding, event) { - for (var p in binding.event) { - if (event[p] != binding.event[p]) - return false; + function timerExpired() { + var time = now(); + if (shouldInvoke(time)) { + return trailingEdge(time); } + // Restart the timer. + timerId = setTimeout(timerExpired, remainingWait(time)); + } - return (!binding.capture) === (event.eventPhase !== Event.CAPTURING_PHASE); - } + function trailingEdge(time) { + timerId = undefined; - function capture() { - for (var i = 0; i < bindings.length; i++) { - var binding = bindings[i]; - if (matches(binding, d3.event)) { - binding.callback(); - } + // Only invoke if we have `lastArgs` which means `func` has been + // debounced at least once. + if (trailing && lastArgs) { + return invokeFunc(time); } - } + lastArgs = lastThis = undefined; + return result; + } - function bubble() { - var tagName = d3.select(d3.event.target).node().tagName; - if (tagName == 'INPUT' || tagName == 'SELECT' || tagName == 'TEXTAREA') { - return; + function cancel() { + if (timerId !== undefined) { + clearTimeout(timerId); } - capture(); - } - - function keybinding(selection) { - selection = selection || d3.select(document); - selection.on('keydown.capture' + namespace, capture, true); - selection.on('keydown.bubble' + namespace, bubble, false); - return keybinding; - } - - keybinding.off = function(selection) { - selection = selection || d3.select(document); - selection.on('keydown.capture' + namespace, null); - selection.on('keydown.bubble' + namespace, null); - return keybinding; - }; + lastInvokeTime = 0; + lastArgs = lastCallTime = lastThis = timerId = undefined; + } - keybinding.on = function(code, callback, capture) { - var binding = { - event: { - keyCode: 0, - shiftKey: false, - ctrlKey: false, - altKey: false, - metaKey: false - }, - capture: capture, - callback: callback - }; + function flush() { + return timerId === undefined ? result : trailingEdge(now()); + } - code = code.toLowerCase().match(/(?:(?:[^+⇧⌃⌥⌘])+|[⇧⌃⌥⌘]|\+\+|^\+$)/g); + function debounced() { + var time = now(), + isInvoking = shouldInvoke(time); - for (var i = 0; i < code.length; i++) { - // Normalise matching errors - if (code[i] === '++') code[i] = '+'; + lastArgs = arguments; + lastThis = this; + lastCallTime = time; - if (code[i] in d3.keybinding.modifierCodes) { - binding.event[d3.keybinding.modifierProperties[d3.keybinding.modifierCodes[code[i]]]] = true; - } else if (code[i] in d3.keybinding.keyCodes) { - binding.event.keyCode = d3.keybinding.keyCodes[code[i]]; - } + if (isInvoking) { + if (timerId === undefined) { + return leadingEdge(lastCallTime); + } + if (maxing) { + // Handle invocations in a tight loop. + timerId = setTimeout(timerExpired, wait); + return invokeFunc(lastCallTime); + } } + if (timerId === undefined) { + timerId = setTimeout(timerExpired, wait); + } + return result; + } + debounced.cancel = cancel; + debounced.flush = flush; + return debounced; + } - bindings.push(binding); + /** + * Defers invoking the `func` until the current call stack has cleared. Any + * additional arguments are provided to `func` when it's invoked. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to defer. + * @param {...*} [args] The arguments to invoke `func` with. + * @returns {number} Returns the timer id. + * @example + * + * _.defer(function(text) { + * console.log(text); + * }, 'deferred'); + * // => Logs 'deferred' after one millisecond. + */ + var defer = baseRest(function(func, args) { + return baseDelay(func, 1, args); + }); - return keybinding; - }; + /** + * Invokes `func` after `wait` milliseconds. Any additional arguments are + * provided to `func` when it's invoked. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to delay. + * @param {number} wait The number of milliseconds to delay invocation. + * @param {...*} [args] The arguments to invoke `func` with. + * @returns {number} Returns the timer id. + * @example + * + * _.delay(function(text) { + * console.log(text); + * }, 1000, 'later'); + * // => Logs 'later' after one second. + */ + var delay = baseRest(function(func, wait, args) { + return baseDelay(func, toNumber(wait) || 0, args); + }); - return keybinding; -}; + /** + * Creates a function that invokes `func` with arguments reversed. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Function + * @param {Function} func The function to flip arguments for. + * @returns {Function} Returns the new flipped function. + * @example + * + * var flipped = _.flip(function() { + * return _.toArray(arguments); + * }); + * + * flipped('a', 'b', 'c', 'd'); + * // => ['d', 'c', 'b', 'a'] + */ + function flip(func) { + return createWrap(func, WRAP_FLIP_FLAG); + } -(function () { - d3.keybinding.modifierCodes = { - // Shift key, ⇧ - '⇧': 16, shift: 16, - // CTRL key, on Mac: ⌃ - '⌃': 17, ctrl: 17, - // ALT key, on Mac: ⌥ (Alt) - '⌥': 18, alt: 18, option: 18, - // META, on Mac: ⌘ (CMD), on Windows (Win), on Linux (Super) - '⌘': 91, meta: 91, cmd: 91, 'super': 91, win: 91 - }; - - d3.keybinding.modifierProperties = { - 16: 'shiftKey', - 17: 'ctrlKey', - 18: 'altKey', - 91: 'metaKey' - }; - - d3.keybinding.keyCodes = { - // Backspace key, on Mac: ⌫ (Backspace) - '⌫': 8, backspace: 8, - // Tab Key, on Mac: ⇥ (Tab), on Windows ⇥⇥ - '⇥': 9, '⇆': 9, tab: 9, - // Return key, ↩ - '↩': 13, 'return': 13, enter: 13, '⌅': 13, - // Pause/Break key - 'pause': 19, 'pause-break': 19, - // Caps Lock key, ⇪ - '⇪': 20, caps: 20, 'caps-lock': 20, - // Escape key, on Mac: ⎋, on Windows: Esc - '⎋': 27, escape: 27, esc: 27, - // Space key - space: 32, - // Page-Up key, or pgup, on Mac: ↖ - '↖': 33, pgup: 33, 'page-up': 33, - // Page-Down key, or pgdown, on Mac: ↘ - '↘': 34, pgdown: 34, 'page-down': 34, - // END key, on Mac: ⇟ - '⇟': 35, end: 35, - // HOME key, on Mac: ⇞ - '⇞': 36, home: 36, - // Insert key, or ins - ins: 45, insert: 45, - // Delete key, on Mac: ⌦ (Delete) - '⌦': 46, del: 46, 'delete': 46, - // Left Arrow Key, or ← - '←': 37, left: 37, 'arrow-left': 37, - // Up Arrow Key, or ↑ - '↑': 38, up: 38, 'arrow-up': 38, - // Right Arrow Key, or → - '→': 39, right: 39, 'arrow-right': 39, - // Up Arrow Key, or ↓ - '↓': 40, down: 40, 'arrow-down': 40, - // odities, printing characters that come out wrong: - // Num-Multiply, or * - '*': 106, star: 106, asterisk: 106, multiply: 106, - // Num-Plus or + - '+': 107, 'plus': 107, - // Num-Subtract, or - - '-': 109, subtract: 109, - // Semicolon - ';': 186, semicolon:186, - // = or equals - '=': 187, 'equals': 187, - // Comma, or , - ',': 188, comma: 188, - 'dash': 189, //??? - // Period, or ., or full-stop - '.': 190, period: 190, 'full-stop': 190, - // Slash, or /, or forward-slash - '/': 191, slash: 191, 'forward-slash': 191, - // Tick, or `, or back-quote - '`': 192, tick: 192, 'back-quote': 192, - // Open bracket, or [ - '[': 219, 'open-bracket': 219, - // Back slash, or \ - '\\': 220, 'back-slash': 220, - // Close backet, or ] - ']': 221, 'close-bracket': 221, - // Apostrophe, or Quote, or ' - '\'': 222, quote: 222, apostrophe: 222 - }; + /** + * Creates a function that memoizes the result of `func`. If `resolver` is + * provided, it determines the cache key for storing the result based on the + * arguments provided to the memoized function. By default, the first argument + * provided to the memoized function is used as the map cache key. The `func` + * is invoked with the `this` binding of the memoized function. + * + * **Note:** The cache is exposed as the `cache` property on the memoized + * function. Its creation may be customized by replacing the `_.memoize.Cache` + * constructor with one whose instances implement the + * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object) + * method interface of `clear`, `delete`, `get`, `has`, and `set`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to have its output memoized. + * @param {Function} [resolver] The function to resolve the cache key. + * @returns {Function} Returns the new memoized function. + * @example + * + * var object = { 'a': 1, 'b': 2 }; + * var other = { 'c': 3, 'd': 4 }; + * + * var values = _.memoize(_.values); + * values(object); + * // => [1, 2] + * + * values(other); + * // => [3, 4] + * + * object.a = 2; + * values(object); + * // => [1, 2] + * + * // Modify the result cache. + * values.cache.set(object, ['a', 'b']); + * values(object); + * // => ['a', 'b'] + * + * // Replace `_.memoize.Cache`. + * _.memoize.Cache = WeakMap; + */ + function memoize(func, resolver) { + if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) { + throw new TypeError(FUNC_ERROR_TEXT); + } + var memoized = function() { + var args = arguments, + key = resolver ? resolver.apply(this, args) : args[0], + cache = memoized.cache; - // NUMPAD 0-9 - var i = 95, n = 0; - while (++i < 106) { - d3.keybinding.keyCodes['num-' + n] = i; - ++n; + if (cache.has(key)) { + return cache.get(key); + } + var result = func.apply(this, args); + memoized.cache = cache.set(key, result) || cache; + return result; + }; + memoized.cache = new (memoize.Cache || MapCache); + return memoized; } - // 0-9 - i = 47; n = 0; - while (++i < 58) { - d3.keybinding.keyCodes[n] = i; - ++n; - } + // Expose `MapCache`. + memoize.Cache = MapCache; - // F1-F25 - i = 111; n = 1; - while (++i < 136) { - d3.keybinding.keyCodes['f' + n] = i; - ++n; + /** + * Creates a function that negates the result of the predicate `func`. The + * `func` predicate is invoked with the `this` binding and arguments of the + * created function. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Function + * @param {Function} predicate The predicate to negate. + * @returns {Function} Returns the new negated function. + * @example + * + * function isEven(n) { + * return n % 2 == 0; + * } + * + * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven)); + * // => [1, 3, 5] + */ + function negate(predicate) { + if (typeof predicate != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + return function() { + var args = arguments; + switch (args.length) { + case 0: return !predicate.call(this); + case 1: return !predicate.call(this, args[0]); + case 2: return !predicate.call(this, args[0], args[1]); + case 3: return !predicate.call(this, args[0], args[1], args[2]); + } + return !predicate.apply(this, args); + }; } - // a-z - i = 64; - while (++i < 91) { - d3.keybinding.keyCodes[String.fromCharCode(i).toLowerCase()] = i; - } -})(); -d3.selection.prototype.one = function (type, listener, capture) { - var target = this, typeOnce = type + ".once"; - function one() { - target.on(typeOnce, null); - listener.apply(this, arguments); - } - target.on(typeOnce, one, capture); - return this; -}; -d3.selection.prototype.size = function (size) { - if (!arguments.length) { - var node = this.node(); - return [node.offsetWidth, - node.offsetHeight]; + /** + * Creates a function that is restricted to invoking `func` once. Repeat calls + * to the function return the value of the first invocation. The `func` is + * invoked with the `this` binding and arguments of the created function. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to restrict. + * @returns {Function} Returns the new restricted function. + * @example + * + * var initialize = _.once(createApplication); + * initialize(); + * initialize(); + * // => `createApplication` is invoked once + */ + function once(func) { + return before(2, func); } - return this.attr({width: size[0], height: size[1]}); -}; -d3.selection.prototype.trigger = function (type) { - this.each(function() { - var evt = document.createEvent('HTMLEvents'); - evt.initEvent(type, true, true); - this.dispatchEvent(evt); - }); -}; -d3.typeahead = function() { - var event = d3.dispatch('accept'), - autohighlight = false, - data; - - var typeahead = function(selection) { - var container, - hidden, - idx = autohighlight ? 0 : -1; - - function setup() { - var rect = selection.node().getBoundingClientRect(); - container = d3.select(document.body) - .append('div').attr('class', 'typeahead') - .style({ - position: 'absolute', - left: rect.left + 'px', - top: rect.bottom + 'px' - }); - selection - .on('keyup.typeahead', key); - hidden = false; - } - function hide() { - container.remove(); - idx = autohighlight ? 0 : -1; - hidden = true; + /** + * Creates a function that invokes `func` with its arguments transformed. + * + * @static + * @since 4.0.0 + * @memberOf _ + * @category Function + * @param {Function} func The function to wrap. + * @param {...(Function|Function[])} [transforms=[_.identity]] + * The argument transforms. + * @returns {Function} Returns the new function. + * @example + * + * function doubled(n) { + * return n * 2; + * } + * + * function square(n) { + * return n * n; + * } + * + * var func = _.overArgs(function(x, y) { + * return [x, y]; + * }, [square, doubled]); + * + * func(9, 3); + * // => [81, 6] + * + * func(10, 5); + * // => [100, 10] + */ + var overArgs = castRest(function(func, transforms) { + transforms = (transforms.length == 1 && isArray(transforms[0])) + ? arrayMap(transforms[0], baseUnary(getIteratee())) + : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee())); + + var funcsLength = transforms.length; + return baseRest(function(args) { + var index = -1, + length = nativeMin(args.length, funcsLength); + + while (++index < length) { + args[index] = transforms[index].call(this, args[index]); } + return apply(func, this, args); + }); + }); - function slowHide() { - if (autohighlight) { - if (container.select('a.selected').node()) { - select(container.select('a.selected').datum()); - event.accept(); - } - } - window.setTimeout(hide, 150); - } + /** + * Creates a function that invokes `func` with `partials` prepended to the + * arguments it receives. This method is like `_.bind` except it does **not** + * alter the `this` binding. + * + * The `_.partial.placeholder` value, which defaults to `_` in monolithic + * builds, may be used as a placeholder for partially applied arguments. + * + * **Note:** This method doesn't set the "length" property of partially + * applied functions. + * + * @static + * @memberOf _ + * @since 0.2.0 + * @category Function + * @param {Function} func The function to partially apply arguments to. + * @param {...*} [partials] The arguments to be partially applied. + * @returns {Function} Returns the new partially applied function. + * @example + * + * function greet(greeting, name) { + * return greeting + ' ' + name; + * } + * + * var sayHelloTo = _.partial(greet, 'hello'); + * sayHelloTo('fred'); + * // => 'hello fred' + * + * // Partially applied with placeholders. + * var greetFred = _.partial(greet, _, 'fred'); + * greetFred('hi'); + * // => 'hi fred' + */ + var partial = baseRest(function(func, partials) { + var holders = replaceHolders(partials, getHolder(partial)); + return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders); + }); - selection - .on('focus.typeahead', setup) - .on('blur.typeahead', slowHide); - - function key() { - var len = container.selectAll('a').data().length; - if (d3.event.keyCode === 40) { - idx = Math.min(idx + 1, len - 1); - return highlight(); - } else if (d3.event.keyCode === 38) { - idx = Math.max(idx - 1, 0); - return highlight(); - } else if (d3.event.keyCode === 13) { - if (container.select('a.selected').node()) { - select(container.select('a.selected').datum()); - } - event.accept(); - hide(); - } else { - update(); - } - } + /** + * This method is like `_.partial` except that partially applied arguments + * are appended to the arguments it receives. + * + * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic + * builds, may be used as a placeholder for partially applied arguments. + * + * **Note:** This method doesn't set the "length" property of partially + * applied functions. + * + * @static + * @memberOf _ + * @since 1.0.0 + * @category Function + * @param {Function} func The function to partially apply arguments to. + * @param {...*} [partials] The arguments to be partially applied. + * @returns {Function} Returns the new partially applied function. + * @example + * + * function greet(greeting, name) { + * return greeting + ' ' + name; + * } + * + * var greetFred = _.partialRight(greet, 'fred'); + * greetFred('hi'); + * // => 'hi fred' + * + * // Partially applied with placeholders. + * var sayHelloTo = _.partialRight(greet, 'hello', _); + * sayHelloTo('fred'); + * // => 'hello fred' + */ + var partialRight = baseRest(function(func, partials) { + var holders = replaceHolders(partials, getHolder(partialRight)); + return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders); + }); - function highlight() { - container - .selectAll('a') - .classed('selected', function(d, i) { return i == idx; }); - } + /** + * Creates a function that invokes `func` with arguments arranged according + * to the specified `indexes` where the argument value at the first index is + * provided as the first argument, the argument value at the second index is + * provided as the second argument, and so on. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Function + * @param {Function} func The function to rearrange arguments for. + * @param {...(number|number[])} indexes The arranged argument indexes. + * @returns {Function} Returns the new function. + * @example + * + * var rearged = _.rearg(function(a, b, c) { + * return [a, b, c]; + * }, [2, 0, 1]); + * + * rearged('b', 'c', 'a') + * // => ['a', 'b', 'c'] + */ + var rearg = flatRest(function(func, indexes) { + return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes); + }); - function update() { - if (hidden) setup(); + /** + * Creates a function that invokes `func` with the `this` binding of the + * created function and arguments from `start` and beyond provided as + * an array. + * + * **Note:** This method is based on the + * [rest parameter](https://mdn.io/rest_parameters). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Function + * @param {Function} func The function to apply a rest parameter to. + * @param {number} [start=func.length-1] The start position of the rest parameter. + * @returns {Function} Returns the new function. + * @example + * + * var say = _.rest(function(what, names) { + * return what + ' ' + _.initial(names).join(', ') + + * (_.size(names) > 1 ? ', & ' : '') + _.last(names); + * }); + * + * say('hello', 'fred', 'barney', 'pebbles'); + * // => 'hello fred, barney, & pebbles' + */ + function rest(func, start) { + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + start = start === undefined ? start : toInteger(start); + return baseRest(func, start); + } - data(selection, function(data) { - container.style('display', function() { - return data.length ? 'block' : 'none'; - }); + /** + * Creates a function that invokes `func` with the `this` binding of the + * create function and an array of arguments much like + * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply). + * + * **Note:** This method is based on the + * [spread operator](https://mdn.io/spread_operator). + * + * @static + * @memberOf _ + * @since 3.2.0 + * @category Function + * @param {Function} func The function to spread arguments over. + * @param {number} [start=0] The start position of the spread. + * @returns {Function} Returns the new function. + * @example + * + * var say = _.spread(function(who, what) { + * return who + ' says ' + what; + * }); + * + * say(['fred', 'hello']); + * // => 'fred says hello' + * + * var numbers = Promise.all([ + * Promise.resolve(40), + * Promise.resolve(36) + * ]); + * + * numbers.then(_.spread(function(x, y) { + * return x + y; + * })); + * // => a Promise of 76 + */ + function spread(func, start) { + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + start = start == null ? 0 : nativeMax(toInteger(start), 0); + return baseRest(function(args) { + var array = args[start], + otherArgs = castSlice(args, 0, start); - var options = container - .selectAll('a') - .data(data, function(d) { return d.value; }); + if (array) { + arrayPush(otherArgs, array); + } + return apply(func, this, otherArgs); + }); + } - options.enter() - .append('a') - .text(function(d) { return d.value; }) - .attr('title', function(d) { return d.title; }) - .on('click', select); + /** + * Creates a throttled function that only invokes `func` at most once per + * every `wait` milliseconds. The throttled function comes with a `cancel` + * method to cancel delayed `func` invocations and a `flush` method to + * immediately invoke them. Provide `options` to indicate whether `func` + * should be invoked on the leading and/or trailing edge of the `wait` + * timeout. The `func` is invoked with the last arguments provided to the + * throttled function. Subsequent calls to the throttled function return the + * result of the last `func` invocation. + * + * **Note:** If `leading` and `trailing` options are `true`, `func` is + * invoked on the trailing edge of the timeout only if the throttled function + * is invoked more than once during the `wait` timeout. + * + * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred + * until to the next tick, similar to `setTimeout` with a timeout of `0`. + * + * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/) + * for details over the differences between `_.throttle` and `_.debounce`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to throttle. + * @param {number} [wait=0] The number of milliseconds to throttle invocations to. + * @param {Object} [options={}] The options object. + * @param {boolean} [options.leading=true] + * Specify invoking on the leading edge of the timeout. + * @param {boolean} [options.trailing=true] + * Specify invoking on the trailing edge of the timeout. + * @returns {Function} Returns the new throttled function. + * @example + * + * // Avoid excessively updating the position while scrolling. + * jQuery(window).on('scroll', _.throttle(updatePosition, 100)); + * + * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes. + * var throttled = _.throttle(renewToken, 300000, { 'trailing': false }); + * jQuery(element).on('click', throttled); + * + * // Cancel the trailing throttled invocation. + * jQuery(window).on('popstate', throttled.cancel); + */ + function throttle(func, wait, options) { + var leading = true, + trailing = true; - options.exit().remove(); + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + if (isObject(options)) { + leading = 'leading' in options ? !!options.leading : leading; + trailing = 'trailing' in options ? !!options.trailing : trailing; + } + return debounce(func, wait, { + 'leading': leading, + 'maxWait': wait, + 'trailing': trailing + }); + } - options - .classed('selected', function(d, i) { return i == idx; }); - }); - } + /** + * Creates a function that accepts up to one argument, ignoring any + * additional arguments. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Function + * @param {Function} func The function to cap arguments for. + * @returns {Function} Returns the new capped function. + * @example + * + * _.map(['6', '8', '10'], _.unary(parseInt)); + * // => [6, 8, 10] + */ + function unary(func) { + return ary(func, 1); + } - function select(d) { - selection - .property('value', d.value) - .trigger('change'); - } + /** + * Creates a function that provides `value` to `wrapper` as its first + * argument. Any additional arguments provided to the function are appended + * to those provided to the `wrapper`. The wrapper is invoked with the `this` + * binding of the created function. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {*} value The value to wrap. + * @param {Function} [wrapper=identity] The wrapper function. + * @returns {Function} Returns the new function. + * @example + * + * var p = _.wrap(_.escape, function(func, text) { + * return '

' + func(text) + '

'; + * }); + * + * p('fred, barney, & pebbles'); + * // => '

fred, barney, & pebbles

' + */ + function wrap(value, wrapper) { + return partial(castFunction(wrapper), value); + } - }; + /*------------------------------------------------------------------------*/ - typeahead.data = function(_) { - if (!arguments.length) return data; - data = _; - return typeahead; - }; + /** + * Casts `value` as an array if it's not one. + * + * @static + * @memberOf _ + * @since 4.4.0 + * @category Lang + * @param {*} value The value to inspect. + * @returns {Array} Returns the cast array. + * @example + * + * _.castArray(1); + * // => [1] + * + * _.castArray({ 'a': 1 }); + * // => [{ 'a': 1 }] + * + * _.castArray('abc'); + * // => ['abc'] + * + * _.castArray(null); + * // => [null] + * + * _.castArray(undefined); + * // => [undefined] + * + * _.castArray(); + * // => [] + * + * var array = [1, 2, 3]; + * console.log(_.castArray(array) === array); + * // => true + */ + function castArray() { + if (!arguments.length) { + return []; + } + var value = arguments[0]; + return isArray(value) ? value : [value]; + } - typeahead.autohighlight = function(_) { - if (!arguments.length) return autohighlight; - autohighlight = _; - return typeahead; - }; + /** + * Creates a shallow clone of `value`. + * + * **Note:** This method is loosely based on the + * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm) + * and supports cloning arrays, array buffers, booleans, date objects, maps, + * numbers, `Object` objects, regexes, sets, strings, symbols, and typed + * arrays. The own enumerable properties of `arguments` objects are cloned + * as plain objects. An empty object is returned for uncloneable values such + * as error objects, functions, DOM nodes, and WeakMaps. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to clone. + * @returns {*} Returns the cloned value. + * @see _.cloneDeep + * @example + * + * var objects = [{ 'a': 1 }, { 'b': 2 }]; + * + * var shallow = _.clone(objects); + * console.log(shallow[0] === objects[0]); + * // => true + */ + function clone(value) { + return baseClone(value, CLONE_SYMBOLS_FLAG); + } - return d3.rebind(typeahead, event, 'on'); -}; -// Tooltips and svg mask used to highlight certain features -d3.curtain = function() { + /** + * This method is like `_.clone` except that it accepts `customizer` which + * is invoked to produce the cloned value. If `customizer` returns `undefined`, + * cloning is handled by the method instead. The `customizer` is invoked with + * up to four arguments; (value [, index|key, object, stack]). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to clone. + * @param {Function} [customizer] The function to customize cloning. + * @returns {*} Returns the cloned value. + * @see _.cloneDeepWith + * @example + * + * function customizer(value) { + * if (_.isElement(value)) { + * return value.cloneNode(false); + * } + * } + * + * var el = _.cloneWith(document.body, customizer); + * + * console.log(el === document.body); + * // => false + * console.log(el.nodeName); + * // => 'BODY' + * console.log(el.childNodes.length); + * // => 0 + */ + function cloneWith(value, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return baseClone(value, CLONE_SYMBOLS_FLAG, customizer); + } - var event = d3.dispatch(), - surface, - tooltip, - darkness; + /** + * This method is like `_.clone` except that it recursively clones `value`. + * + * @static + * @memberOf _ + * @since 1.0.0 + * @category Lang + * @param {*} value The value to recursively clone. + * @returns {*} Returns the deep cloned value. + * @see _.clone + * @example + * + * var objects = [{ 'a': 1 }, { 'b': 2 }]; + * + * var deep = _.cloneDeep(objects); + * console.log(deep[0] === objects[0]); + * // => false + */ + function cloneDeep(value) { + return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG); + } - function curtain(selection) { + /** + * This method is like `_.cloneWith` except that it recursively clones `value`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to recursively clone. + * @param {Function} [customizer] The function to customize cloning. + * @returns {*} Returns the deep cloned value. + * @see _.cloneWith + * @example + * + * function customizer(value) { + * if (_.isElement(value)) { + * return value.cloneNode(true); + * } + * } + * + * var el = _.cloneDeepWith(document.body, customizer); + * + * console.log(el === document.body); + * // => false + * console.log(el.nodeName); + * // => 'BODY' + * console.log(el.childNodes.length); + * // => 20 + */ + function cloneDeepWith(value, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer); + } - surface = selection.append('svg') - .attr('id', 'curtain') - .style({ - 'z-index': 1000, - 'pointer-events': 'none', - 'position': 'absolute', - 'top': 0, - 'left': 0 - }); + /** + * Checks if `object` conforms to `source` by invoking the predicate + * properties of `source` with the corresponding property values of `object`. + * + * **Note:** This method is equivalent to `_.conforms` when `source` is + * partially applied. + * + * @static + * @memberOf _ + * @since 4.14.0 + * @category Lang + * @param {Object} object The object to inspect. + * @param {Object} source The object of property predicates to conform to. + * @returns {boolean} Returns `true` if `object` conforms, else `false`. + * @example + * + * var object = { 'a': 1, 'b': 2 }; + * + * _.conformsTo(object, { 'b': function(n) { return n > 1; } }); + * // => true + * + * _.conformsTo(object, { 'b': function(n) { return n > 2; } }); + * // => false + */ + function conformsTo(object, source) { + return source == null || baseConformsTo(object, source, keys(source)); + } - darkness = surface.append('path') - .attr({ - x: 0, - y: 0, - 'class': 'curtain-darkness' - }); + /** + * Performs a + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * comparison between two values to determine if they are equivalent. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * var object = { 'a': 1 }; + * var other = { 'a': 1 }; + * + * _.eq(object, object); + * // => true + * + * _.eq(object, other); + * // => false + * + * _.eq('a', 'a'); + * // => true + * + * _.eq('a', Object('a')); + * // => false + * + * _.eq(NaN, NaN); + * // => true + */ + function eq(value, other) { + return value === other || (value !== value && other !== other); + } + + /** + * Checks if `value` is greater than `other`. + * + * @static + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is greater than `other`, + * else `false`. + * @see _.lt + * @example + * + * _.gt(3, 1); + * // => true + * + * _.gt(3, 3); + * // => false + * + * _.gt(1, 3); + * // => false + */ + var gt = createRelationalOperation(baseGt); - d3.select(window).on('resize.curtain', resize); + /** + * Checks if `value` is greater than or equal to `other`. + * + * @static + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is greater than or equal to + * `other`, else `false`. + * @see _.lte + * @example + * + * _.gte(3, 1); + * // => true + * + * _.gte(3, 3); + * // => true + * + * _.gte(1, 3); + * // => false + */ + var gte = createRelationalOperation(function(value, other) { + return value >= other; + }); - tooltip = selection.append('div') - .attr('class', 'tooltip') - .style('z-index', 1002); + /** + * Checks if `value` is likely an `arguments` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an `arguments` object, + * else `false`. + * @example + * + * _.isArguments(function() { return arguments; }()); + * // => true + * + * _.isArguments([1, 2, 3]); + * // => false + */ + var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) { + return isObjectLike(value) && hasOwnProperty.call(value, 'callee') && + !propertyIsEnumerable.call(value, 'callee'); + }; - tooltip.append('div').attr('class', 'tooltip-arrow'); - tooltip.append('div').attr('class', 'tooltip-inner'); + /** + * Checks if `value` is classified as an `Array` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array, else `false`. + * @example + * + * _.isArray([1, 2, 3]); + * // => true + * + * _.isArray(document.body.children); + * // => false + * + * _.isArray('abc'); + * // => false + * + * _.isArray(_.noop); + * // => false + */ + var isArray = Array.isArray; - resize(); + /** + * Checks if `value` is classified as an `ArrayBuffer` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`. + * @example + * + * _.isArrayBuffer(new ArrayBuffer(2)); + * // => true + * + * _.isArrayBuffer(new Array(2)); + * // => false + */ + var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer; - function resize() { - surface.attr({ - width: window.innerWidth, - height: window.innerHeight - }); - curtain.cut(darkness.datum()); - } + /** + * Checks if `value` is array-like. A value is considered array-like if it's + * not a function and has a `value.length` that's an integer greater than or + * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is array-like, else `false`. + * @example + * + * _.isArrayLike([1, 2, 3]); + * // => true + * + * _.isArrayLike(document.body.children); + * // => true + * + * _.isArrayLike('abc'); + * // => true + * + * _.isArrayLike(_.noop); + * // => false + */ + function isArrayLike(value) { + return value != null && isLength(value.length) && !isFunction(value); } - curtain.reveal = function(box, text, tooltipclass, duration) { - if (typeof box === 'string') box = d3.select(box).node(); - if (box.getBoundingClientRect) box = box.getBoundingClientRect(); + /** + * This method is like `_.isArrayLike` except that it also checks if `value` + * is an object. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array-like object, + * else `false`. + * @example + * + * _.isArrayLikeObject([1, 2, 3]); + * // => true + * + * _.isArrayLikeObject(document.body.children); + * // => true + * + * _.isArrayLikeObject('abc'); + * // => false + * + * _.isArrayLikeObject(_.noop); + * // => false + */ + function isArrayLikeObject(value) { + return isObjectLike(value) && isArrayLike(value); + } - curtain.cut(box, duration); + /** + * Checks if `value` is classified as a boolean primitive or object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a boolean, else `false`. + * @example + * + * _.isBoolean(false); + * // => true + * + * _.isBoolean(null); + * // => false + */ + function isBoolean(value) { + return value === true || value === false || + (isObjectLike(value) && baseGetTag(value) == boolTag); + } - if (text) { - // pseudo markdown bold text hack - var parts = text.split('**'); - var html = parts[0] ? '' + parts[0] + '' : ''; - if (parts[1]) html += '' + parts[1] + ''; + /** + * Checks if `value` is a buffer. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a buffer, else `false`. + * @example + * + * _.isBuffer(new Buffer(2)); + * // => true + * + * _.isBuffer(new Uint8Array(2)); + * // => false + */ + var isBuffer = nativeIsBuffer || stubFalse; - var size = tooltip.classed('in', true) - .select('.tooltip-inner') - .html(html) - .size(); + /** + * Checks if `value` is classified as a `Date` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a date object, else `false`. + * @example + * + * _.isDate(new Date); + * // => true + * + * _.isDate('Mon April 23 2012'); + * // => false + */ + var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate; - var pos; + /** + * Checks if `value` is likely a DOM element. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`. + * @example + * + * _.isElement(document.body); + * // => true + * + * _.isElement(''); + * // => false + */ + function isElement(value) { + return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value); + } - var w = window.innerWidth, - h = window.innerHeight; + /** + * Checks if `value` is an empty object, collection, map, or set. + * + * Objects are considered empty if they have no own enumerable string keyed + * properties. + * + * Array-like values such as `arguments` objects, arrays, buffers, strings, or + * jQuery-like collections are considered empty if they have a `length` of `0`. + * Similarly, maps and sets are considered empty if they have a `size` of `0`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is empty, else `false`. + * @example + * + * _.isEmpty(null); + * // => true + * + * _.isEmpty(true); + * // => true + * + * _.isEmpty(1); + * // => true + * + * _.isEmpty([1, 2, 3]); + * // => false + * + * _.isEmpty({ 'a': 1 }); + * // => false + */ + function isEmpty(value) { + if (value == null) { + return true; + } + if (isArrayLike(value) && + (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' || + isBuffer(value) || isTypedArray(value) || isArguments(value))) { + return !value.length; + } + var tag = getTag(value); + if (tag == mapTag || tag == setTag) { + return !value.size; + } + if (isPrototype(value)) { + return !baseKeys(value).length; + } + for (var key in value) { + if (hasOwnProperty.call(value, key)) { + return false; + } + } + return true; + } - if (box.top + box.height < Math.min(100, box.width + box.left)) { - side = 'bottom'; - pos = [box.left + box.width / 2 - size[0]/ 2, box.top + box.height]; + /** + * Performs a deep comparison between two values to determine if they are + * equivalent. + * + * **Note:** This method supports comparing arrays, array buffers, booleans, + * date objects, error objects, maps, numbers, `Object` objects, regexes, + * sets, strings, symbols, and typed arrays. `Object` objects are compared + * by their own, not inherited, enumerable properties. Functions and DOM + * nodes are compared by strict equality, i.e. `===`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * var object = { 'a': 1 }; + * var other = { 'a': 1 }; + * + * _.isEqual(object, other); + * // => true + * + * object === other; + * // => false + */ + function isEqual(value, other) { + return baseIsEqual(value, other); + } - } else if (box.left + box.width + 300 < window.innerWidth) { - side = 'right'; - pos = [box.left + box.width, box.top + box.height / 2 - size[1] / 2]; + /** + * This method is like `_.isEqual` except that it accepts `customizer` which + * is invoked to compare values. If `customizer` returns `undefined`, comparisons + * are handled by the method instead. The `customizer` is invoked with up to + * six arguments: (objValue, othValue [, index|key, object, other, stack]). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @param {Function} [customizer] The function to customize comparisons. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * function isGreeting(value) { + * return /^h(?:i|ello)$/.test(value); + * } + * + * function customizer(objValue, othValue) { + * if (isGreeting(objValue) && isGreeting(othValue)) { + * return true; + * } + * } + * + * var array = ['hello', 'goodbye']; + * var other = ['hi', 'goodbye']; + * + * _.isEqualWith(array, other, customizer); + * // => true + */ + function isEqualWith(value, other, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + var result = customizer ? customizer(value, other) : undefined; + return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result; + } - } else if (box.left > 300) { - side = 'left'; - pos = [box.left - 200, box.top + box.height / 2 - size[1] / 2]; - } else { - side = 'bottom'; - pos = [box.left, box.top + box.height]; - } + /** + * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`, + * `SyntaxError`, `TypeError`, or `URIError` object. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an error object, else `false`. + * @example + * + * _.isError(new Error); + * // => true + * + * _.isError(Error); + * // => false + */ + function isError(value) { + if (!isObjectLike(value)) { + return false; + } + var tag = baseGetTag(value); + return tag == errorTag || tag == domExcTag || + (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value)); + } - pos = [ - Math.min(Math.max(10, pos[0]), w - size[0] - 10), - Math.min(Math.max(10, pos[1]), h - size[1] - 10) - ]; + /** + * Checks if `value` is a finite primitive number. + * + * **Note:** This method is based on + * [`Number.isFinite`](https://mdn.io/Number/isFinite). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a finite number, else `false`. + * @example + * + * _.isFinite(3); + * // => true + * + * _.isFinite(Number.MIN_VALUE); + * // => true + * + * _.isFinite(Infinity); + * // => false + * + * _.isFinite('3'); + * // => false + */ + function isFinite(value) { + return typeof value == 'number' && nativeIsFinite(value); + } + /** + * Checks if `value` is classified as a `Function` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a function, else `false`. + * @example + * + * _.isFunction(_); + * // => true + * + * _.isFunction(/abc/); + * // => false + */ + function isFunction(value) { + if (!isObject(value)) { + return false; + } + // The use of `Object#toString` avoids issues with the `typeof` operator + // in Safari 9 which returns 'object' for typed arrays and other constructors. + var tag = baseGetTag(value); + return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag; + } - if (duration !== 0 || !tooltip.classed(side)) tooltip.call(iD.ui.Toggle(true)); + /** + * Checks if `value` is an integer. + * + * **Note:** This method is based on + * [`Number.isInteger`](https://mdn.io/Number/isInteger). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an integer, else `false`. + * @example + * + * _.isInteger(3); + * // => true + * + * _.isInteger(Number.MIN_VALUE); + * // => false + * + * _.isInteger(Infinity); + * // => false + * + * _.isInteger('3'); + * // => false + */ + function isInteger(value) { + return typeof value == 'number' && value == toInteger(value); + } - tooltip - .style('top', pos[1] + 'px') - .style('left', pos[0] + 'px') - .attr('class', 'curtain-tooltip tooltip in ' + side + ' ' + tooltipclass) - .select('.tooltip-inner') - .html(html); + /** + * Checks if `value` is a valid array-like length. + * + * **Note:** This method is loosely based on + * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a valid length, else `false`. + * @example + * + * _.isLength(3); + * // => true + * + * _.isLength(Number.MIN_VALUE); + * // => false + * + * _.isLength(Infinity); + * // => false + * + * _.isLength('3'); + * // => false + */ + function isLength(value) { + return typeof value == 'number' && + value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER; + } - } else { - tooltip.call(iD.ui.Toggle(false)); - } - }; - - curtain.cut = function(datum, duration) { - darkness.datum(datum); - - (duration === 0 ? darkness : darkness.transition().duration(duration || 600)) - .attr('d', function(d) { - var string = "M 0,0 L 0," + window.innerHeight + " L " + - window.innerWidth + "," + window.innerHeight + "L" + - window.innerWidth + ",0 Z"; + /** + * Checks if `value` is the + * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types) + * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an object, else `false`. + * @example + * + * _.isObject({}); + * // => true + * + * _.isObject([1, 2, 3]); + * // => true + * + * _.isObject(_.noop); + * // => true + * + * _.isObject(null); + * // => false + */ + function isObject(value) { + var type = typeof value; + return value != null && (type == 'object' || type == 'function'); + } - if (!d) return string; - return string + 'M' + - d.left + ',' + d.top + 'L' + - d.left + ',' + (d.top + d.height) + 'L' + - (d.left + d.width) + ',' + (d.top + d.height) + 'L' + - (d.left + d.width) + ',' + (d.top) + 'Z'; + /** + * Checks if `value` is object-like. A value is object-like if it's not `null` + * and has a `typeof` result of "object". + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is object-like, else `false`. + * @example + * + * _.isObjectLike({}); + * // => true + * + * _.isObjectLike([1, 2, 3]); + * // => true + * + * _.isObjectLike(_.noop); + * // => false + * + * _.isObjectLike(null); + * // => false + */ + function isObjectLike(value) { + return value != null && typeof value == 'object'; + } - }); - }; + /** + * Checks if `value` is classified as a `Map` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a map, else `false`. + * @example + * + * _.isMap(new Map); + * // => true + * + * _.isMap(new WeakMap); + * // => false + */ + var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap; - curtain.remove = function() { - surface.remove(); - tooltip.remove(); - }; + /** + * Performs a partial deep comparison between `object` and `source` to + * determine if `object` contains equivalent property values. + * + * **Note:** This method is equivalent to `_.matches` when `source` is + * partially applied. + * + * Partial comparisons will match empty array and empty object `source` + * values against any array or object value, respectively. See `_.isEqual` + * for a list of supported value comparisons. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {Object} object The object to inspect. + * @param {Object} source The object of property values to match. + * @returns {boolean} Returns `true` if `object` is a match, else `false`. + * @example + * + * var object = { 'a': 1, 'b': 2 }; + * + * _.isMatch(object, { 'b': 2 }); + * // => true + * + * _.isMatch(object, { 'b': 1 }); + * // => false + */ + function isMatch(object, source) { + return object === source || baseIsMatch(object, source, getMatchData(source)); + } - return d3.rebind(curtain, event, 'on'); -}; -var JXON = new (function () { - var - sValueProp = "keyValue", sAttributesProp = "keyAttributes", sAttrPref = "@", /* you can customize these values */ - aCache = [], rIsNull = /^\s*$/, rIsBool = /^(?:true|false)$/i; + /** + * This method is like `_.isMatch` except that it accepts `customizer` which + * is invoked to compare values. If `customizer` returns `undefined`, comparisons + * are handled by the method instead. The `customizer` is invoked with five + * arguments: (objValue, srcValue, index|key, object, source). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {Object} object The object to inspect. + * @param {Object} source The object of property values to match. + * @param {Function} [customizer] The function to customize comparisons. + * @returns {boolean} Returns `true` if `object` is a match, else `false`. + * @example + * + * function isGreeting(value) { + * return /^h(?:i|ello)$/.test(value); + * } + * + * function customizer(objValue, srcValue) { + * if (isGreeting(objValue) && isGreeting(srcValue)) { + * return true; + * } + * } + * + * var object = { 'greeting': 'hello' }; + * var source = { 'greeting': 'hi' }; + * + * _.isMatchWith(object, source, customizer); + * // => true + */ + function isMatchWith(object, source, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return baseIsMatch(object, source, getMatchData(source), customizer); + } - function parseText (sValue) { - if (rIsNull.test(sValue)) { return null; } - if (rIsBool.test(sValue)) { return sValue.toLowerCase() === "true"; } - if (isFinite(sValue)) { return parseFloat(sValue); } - if (isFinite(Date.parse(sValue))) { return new Date(sValue); } - return sValue; - } + /** + * Checks if `value` is `NaN`. + * + * **Note:** This method is based on + * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as + * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for + * `undefined` and other non-number values. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`. + * @example + * + * _.isNaN(NaN); + * // => true + * + * _.isNaN(new Number(NaN)); + * // => true + * + * isNaN(undefined); + * // => true + * + * _.isNaN(undefined); + * // => false + */ + function isNaN(value) { + // An `NaN` primitive is the only value that is not equal to itself. + // Perform the `toStringTag` check first to avoid errors with some + // ActiveX objects in IE. + return isNumber(value) && value != +value; + } - function EmptyTree () { } - EmptyTree.prototype.toString = function () { return "null"; }; - EmptyTree.prototype.valueOf = function () { return null; }; + /** + * Checks if `value` is a pristine native function. + * + * **Note:** This method can't reliably detect native functions in the presence + * of the core-js package because core-js circumvents this kind of detection. + * Despite multiple requests, the core-js maintainer has made it clear: any + * attempt to fix the detection will be obstructed. As a result, we're left + * with little choice but to throw an error. Unfortunately, this also affects + * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill), + * which rely on core-js. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a native function, + * else `false`. + * @example + * + * _.isNative(Array.prototype.push); + * // => true + * + * _.isNative(_); + * // => false + */ + function isNative(value) { + if (isMaskable(value)) { + throw new Error(CORE_ERROR_TEXT); + } + return baseIsNative(value); + } - function objectify (vValue) { - return vValue === null ? new EmptyTree() : vValue instanceof Object ? vValue : new vValue.constructor(vValue); - } + /** + * Checks if `value` is `null`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `null`, else `false`. + * @example + * + * _.isNull(null); + * // => true + * + * _.isNull(void 0); + * // => false + */ + function isNull(value) { + return value === null; + } - function createObjTree (oParentNode, nVerb, bFreeze, bNesteAttr) { - var - nLevelStart = aCache.length, bChildren = oParentNode.hasChildNodes(), - bAttributes = oParentNode.hasAttributes(), bHighVerb = Boolean(nVerb & 2); + /** + * Checks if `value` is `null` or `undefined`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is nullish, else `false`. + * @example + * + * _.isNil(null); + * // => true + * + * _.isNil(void 0); + * // => true + * + * _.isNil(NaN); + * // => false + */ + function isNil(value) { + return value == null; + } - var - sProp, vContent, nLength = 0, sCollectedTxt = "", - vResult = bHighVerb ? {} : /* put here the default value for empty nodes: */ true; + /** + * Checks if `value` is classified as a `Number` primitive or object. + * + * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are + * classified as numbers, use the `_.isFinite` method. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a number, else `false`. + * @example + * + * _.isNumber(3); + * // => true + * + * _.isNumber(Number.MIN_VALUE); + * // => true + * + * _.isNumber(Infinity); + * // => true + * + * _.isNumber('3'); + * // => false + */ + function isNumber(value) { + return typeof value == 'number' || + (isObjectLike(value) && baseGetTag(value) == numberTag); + } - if (bChildren) { - for (var oNode, nItem = 0; nItem < oParentNode.childNodes.length; nItem++) { - oNode = oParentNode.childNodes.item(nItem); - if (oNode.nodeType === 4) { sCollectedTxt += oNode.nodeValue; } /* nodeType is "CDATASection" (4) */ - else if (oNode.nodeType === 3) { sCollectedTxt += oNode.nodeValue.trim(); } /* nodeType is "Text" (3) */ - else if (oNode.nodeType === 1 && !oNode.prefix) { aCache.push(oNode); } /* nodeType is "Element" (1) */ + /** + * Checks if `value` is a plain object, that is, an object created by the + * `Object` constructor or one with a `[[Prototype]]` of `null`. + * + * @static + * @memberOf _ + * @since 0.8.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * _.isPlainObject(new Foo); + * // => false + * + * _.isPlainObject([1, 2, 3]); + * // => false + * + * _.isPlainObject({ 'x': 0, 'y': 0 }); + * // => true + * + * _.isPlainObject(Object.create(null)); + * // => true + */ + function isPlainObject(value) { + if (!isObjectLike(value) || baseGetTag(value) != objectTag) { + return false; } + var proto = getPrototype(value); + if (proto === null) { + return true; + } + var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor; + return typeof Ctor == 'function' && Ctor instanceof Ctor && + funcToString.call(Ctor) == objectCtorString; } - var nLevelEnd = aCache.length, vBuiltVal = parseText(sCollectedTxt); - - if (!bHighVerb && (bChildren || bAttributes)) { vResult = nVerb === 0 ? objectify(vBuiltVal) : {}; } + /** + * Checks if `value` is classified as a `RegExp` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a regexp, else `false`. + * @example + * + * _.isRegExp(/abc/); + * // => true + * + * _.isRegExp('/abc/'); + * // => false + */ + var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp; - for (var nElId = nLevelStart; nElId < nLevelEnd; nElId++) { - sProp = aCache[nElId].nodeName.toLowerCase(); - vContent = createObjTree(aCache[nElId], nVerb, bFreeze, bNesteAttr); - if (vResult.hasOwnProperty(sProp)) { - if (vResult[sProp].constructor !== Array) { vResult[sProp] = [vResult[sProp]]; } - vResult[sProp].push(vContent); - } else { - vResult[sProp] = vContent; - nLength++; - } + /** + * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754 + * double precision number which isn't the result of a rounded unsafe integer. + * + * **Note:** This method is based on + * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`. + * @example + * + * _.isSafeInteger(3); + * // => true + * + * _.isSafeInteger(Number.MIN_VALUE); + * // => false + * + * _.isSafeInteger(Infinity); + * // => false + * + * _.isSafeInteger('3'); + * // => false + */ + function isSafeInteger(value) { + return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER; } - if (bAttributes) { - var - nAttrLen = oParentNode.attributes.length, - sAPrefix = bNesteAttr ? "" : sAttrPref, oAttrParent = bNesteAttr ? {} : vResult; - - for (var oAttrib, nAttrib = 0; nAttrib < nAttrLen; nLength++, nAttrib++) { - oAttrib = oParentNode.attributes.item(nAttrib); - oAttrParent[sAPrefix + oAttrib.name.toLowerCase()] = parseText(oAttrib.value.trim()); - } + /** + * Checks if `value` is classified as a `Set` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a set, else `false`. + * @example + * + * _.isSet(new Set); + * // => true + * + * _.isSet(new WeakSet); + * // => false + */ + var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet; - if (bNesteAttr) { - if (bFreeze) { Object.freeze(oAttrParent); } - vResult[sAttributesProp] = oAttrParent; - nLength -= nAttrLen - 1; - } + /** + * Checks if `value` is classified as a `String` primitive or object. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a string, else `false`. + * @example + * + * _.isString('abc'); + * // => true + * + * _.isString(1); + * // => false + */ + function isString(value) { + return typeof value == 'string' || + (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag); } - if (nVerb === 3 || (nVerb === 2 || nVerb === 1 && nLength > 0) && sCollectedTxt) { - vResult[sValueProp] = vBuiltVal; - } else if (!bHighVerb && nLength === 0 && sCollectedTxt) { - vResult = vBuiltVal; + /** + * Checks if `value` is classified as a `Symbol` primitive or object. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a symbol, else `false`. + * @example + * + * _.isSymbol(Symbol.iterator); + * // => true + * + * _.isSymbol('abc'); + * // => false + */ + function isSymbol(value) { + return typeof value == 'symbol' || + (isObjectLike(value) && baseGetTag(value) == symbolTag); } - if (bFreeze && (bHighVerb || nLength > 0)) { Object.freeze(vResult); } - - aCache.length = nLevelStart; + /** + * Checks if `value` is classified as a typed array. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a typed array, else `false`. + * @example + * + * _.isTypedArray(new Uint8Array); + * // => true + * + * _.isTypedArray([]); + * // => false + */ + var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray; - return vResult; - } + /** + * Checks if `value` is `undefined`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`. + * @example + * + * _.isUndefined(void 0); + * // => true + * + * _.isUndefined(null); + * // => false + */ + function isUndefined(value) { + return value === undefined; + } - function loadObjTree (oXMLDoc, oParentEl, oParentObj) { - var vValue, oChild; + /** + * Checks if `value` is classified as a `WeakMap` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a weak map, else `false`. + * @example + * + * _.isWeakMap(new WeakMap); + * // => true + * + * _.isWeakMap(new Map); + * // => false + */ + function isWeakMap(value) { + return isObjectLike(value) && getTag(value) == weakMapTag; + } - if (oParentObj instanceof String || oParentObj instanceof Number || oParentObj instanceof Boolean) { - oParentEl.appendChild(oXMLDoc.createTextNode(oParentObj.toString())); /* verbosity level is 0 */ - } else if (oParentObj.constructor === Date) { - oParentEl.appendChild(oXMLDoc.createTextNode(oParentObj.toGMTString())); + /** + * Checks if `value` is classified as a `WeakSet` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a weak set, else `false`. + * @example + * + * _.isWeakSet(new WeakSet); + * // => true + * + * _.isWeakSet(new Set); + * // => false + */ + function isWeakSet(value) { + return isObjectLike(value) && baseGetTag(value) == weakSetTag; } - for (var sName in oParentObj) { - vValue = oParentObj[sName]; - if (isFinite(sName) || vValue instanceof Function) { continue; } /* verbosity level is 0 */ - if (sName === sValueProp) { - if (vValue !== null && vValue !== true) { oParentEl.appendChild(oXMLDoc.createTextNode(vValue.constructor === Date ? vValue.toGMTString() : String(vValue))); } - } else if (sName === sAttributesProp) { /* verbosity level is 3 */ - for (var sAttrib in vValue) { oParentEl.setAttribute(sAttrib, vValue[sAttrib]); } - } else if (sName.charAt(0) === sAttrPref) { - oParentEl.setAttribute(sName.slice(1), vValue); - } else if (vValue.constructor === Array) { - for (var nItem = 0; nItem < vValue.length; nItem++) { - oChild = oXMLDoc.createElement(sName); - loadObjTree(oXMLDoc, oChild, vValue[nItem]); - oParentEl.appendChild(oChild); - } - } else { - oChild = oXMLDoc.createElement(sName); - if (vValue instanceof Object) { - loadObjTree(oXMLDoc, oChild, vValue); - } else if (vValue !== null && vValue !== true) { - oChild.appendChild(oXMLDoc.createTextNode(vValue.toString())); - } - oParentEl.appendChild(oChild); - } - } - } - - this.build = function (oXMLParent, nVerbosity /* optional */, bFreeze /* optional */, bNesteAttributes /* optional */) { - var _nVerb = arguments.length > 1 && typeof nVerbosity === "number" ? nVerbosity & 3 : /* put here the default verbosity level: */ 1; - return createObjTree(oXMLParent, _nVerb, bFreeze || false, arguments.length > 3 ? bNesteAttributes : _nVerb === 3); - }; - - this.unbuild = function (oObjTree) { - var oNewDoc = document.implementation.createDocument("", "", null); - loadObjTree(oNewDoc, oNewDoc, oObjTree); - return oNewDoc; - }; - - this.stringify = function (oObjTree) { - return (new XMLSerializer()).serializeToString(JXON.unbuild(oObjTree)); - }; -})(); -// var myObject = JXON.build(doc); -// we got our javascript object! try: alert(JSON.stringify(myObject)); - -// var newDoc = JXON.unbuild(myObject); -// we got our Document instance! try: alert((new XMLSerializer()).serializeToString(newDoc)); -/*! - * Lo-Dash 1.0.0-rc.3 - * (c) 2012 John-David Dalton - * Based on Underscore.js 1.4.3 - * (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc. - * Available under MIT license - */ -;(function(window, undefined) { - - /** Detect free variable `exports` */ - var freeExports = typeof exports == 'object' && exports; - - /** Detect free variable `global` and use it as `window` */ - var freeGlobal = typeof global == 'object' && global; - if (freeGlobal.global === freeGlobal) { - window = freeGlobal; - } - - /** Used for array and object method references */ - var arrayRef = [], - // avoid a Closure Compiler bug by creatively creating an object - objectRef = new function(){}; - - /** Used to generate unique IDs */ - var idCounter = 0; - - /** Used internally to indicate various things */ - var indicatorObject = objectRef; - - /** Used by `cachedContains` as the default size when optimizations are enabled for large arrays */ - var largeArraySize = 30; - - /** Used to restore the original `_` reference in `noConflict` */ - var oldDash = window._; - - /** Used to detect template delimiter values that require a with-statement */ - var reComplexDelimiter = /[-?+=!~*%&^<>|{(\/]|\[\D|\b(?:delete|in|instanceof|new|typeof|void)\b/; - - /** Used to match HTML entities */ - var reEscapedHtml = /&(?:amp|lt|gt|quot|#x27);/g; - - /** Used to match empty string literals in compiled template source */ - var reEmptyStringLeading = /\b__p \+= '';/g, - reEmptyStringMiddle = /\b(__p \+=) '' \+/g, - reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; - - /** Used to match regexp flags from their coerced string values */ - var reFlags = /\w*$/; - - /** Used to insert the data object variable into compiled template source */ - var reInsertVariable = /(?:__e|__t = )\(\s*(?![\d\s"']|this\.)/g; - - /** Used to detect if a method is native */ - var reNative = RegExp('^' + - (objectRef.valueOf + '') - .replace(/[.*+?^=!:${}()|[\]\/\\]/g, '\\$&') - .replace(/valueOf|for [^\]]+/g, '.+?') + '$' - ); - - /** - * Used to match ES6 template delimiters - * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6 - */ - var reEsTemplate = /\$\{((?:(?=\\?)\\?[\s\S])*?)}/g; - - /** Used to match "interpolate" template delimiters */ - var reInterpolate = /<%=([\s\S]+?)%>/g; - - /** Used to ensure capturing order of template delimiters */ - var reNoMatch = /($^)/; - - /** Used to match HTML characters */ - var reUnescapedHtml = /[&<>"']/g; - - /** Used to match unescaped characters in compiled string literals */ - var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g; - - /** Used to fix the JScript [[DontEnum]] bug */ - var shadowed = [ - 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', - 'toLocaleString', 'toString', 'valueOf' - ]; - - /** Used to make template sourceURLs easier to identify */ - var templateCounter = 0; - - /** Native method shortcuts */ - var ceil = Math.ceil, - concat = arrayRef.concat, - floor = Math.floor, - getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf, - hasOwnProperty = objectRef.hasOwnProperty, - push = arrayRef.push, - propertyIsEnumerable = objectRef.propertyIsEnumerable, - toString = objectRef.toString; - - /* Native method shortcuts for methods with the same name as other `lodash` methods */ - var nativeBind = reNative.test(nativeBind = slice.bind) && nativeBind, - nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray, - nativeIsFinite = window.isFinite, - nativeIsNaN = window.isNaN, - nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys, - nativeMax = Math.max, - nativeMin = Math.min, - nativeRandom = Math.random; - - /** `Object#toString` result shortcuts */ - var argsClass = '[object Arguments]', - arrayClass = '[object Array]', - boolClass = '[object Boolean]', - dateClass = '[object Date]', - funcClass = '[object Function]', - numberClass = '[object Number]', - objectClass = '[object Object]', - regexpClass = '[object RegExp]', - stringClass = '[object String]'; - - /** Detect various environments */ - var isIeOpera = !!window.attachEvent, - isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera); - - /* Detect if `Function#bind` exists and is inferred to be fast (all but V8) */ - var isBindFast = nativeBind && !isV8; - - /* Detect if `Object.keys` exists and is inferred to be fast (IE, Opera, V8) */ - var isKeysFast = nativeKeys && (isIeOpera || isV8); - - /** - * Detect the JScript [[DontEnum]] bug: - * - * In IE < 9 an objects own properties, shadowing non-enumerable ones, are - * made non-enumerable as well. - */ - var hasDontEnumBug; - - /** Detect if own properties are iterated after inherited properties (IE < 9) */ - var iteratesOwnLast; - - /** - * Detect if `Array#shift` and `Array#splice` augment array-like objects - * incorrectly: - * - * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()` - * and `splice()` functions that fail to remove the last element, `value[0]`, - * of array-like objects even though the `length` property is set to `0`. - * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()` - * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9. - */ - var hasObjectSpliceBug = (hasObjectSpliceBug = { '0': 1, 'length': 1 }, - arrayRef.splice.call(hasObjectSpliceBug, 0, 1), hasObjectSpliceBug[0]); - - /** Detect if an `arguments` object's indexes are non-enumerable (IE < 9) */ - var nonEnumArgs = true; - - (function() { - var props = []; - function ctor() { this.x = 1; } - ctor.prototype = { 'valueOf': 1, 'y': 1 }; - for (var prop in new ctor) { props.push(prop); } - for (prop in arguments) { nonEnumArgs = !prop; } - - hasDontEnumBug = !/valueOf/.test(props); - iteratesOwnLast = props[0] != 'x'; - }(1)); - - /** Detect if `arguments` objects are `Object` objects (all but Opera < 10.5) */ - var argsAreObjects = arguments.constructor == Object; - - /** Detect if `arguments` objects [[Class]] is unresolvable (Firefox < 4, IE < 9) */ - var noArgsClass = !isArguments(arguments); - - /** - * Detect lack of support for accessing string characters by index: - * - * IE < 8 can't access characters by index and IE 8 can only access - * characters by index on string literals. - */ - var noCharByIndex = ('x'[0] + Object('x')[0]) != 'xx'; - - /** - * Detect if a node's [[Class]] is unresolvable (IE < 9) - * and that the JS engine won't error when attempting to coerce an object to - * a string without a `toString` property value of `typeof` "function". - */ - try { - var noNodeClass = ({ 'toString': 0 } + '', toString.call(document) == objectClass); - } catch(e) { } - - /** - * Detect if sourceURL syntax is usable without erroring: - * - * The JS engine embedded in Adobe products will throw a syntax error when - * it encounters a single line comment beginning with the `@` symbol. - * - * The JS engine in Narwhal will generate the function `function anonymous(){//}` - * and throw a syntax error. - * - * Avoid comments beginning `@` symbols in IE because they are part of its - * non-standard conditional compilation support. - * http://msdn.microsoft.com/en-us/library/121hztk3(v=vs.94).aspx - */ - try { - var useSourceURL = (Function('//@')(), !isIeOpera); - } catch(e) { } - - /** Used to identify object classifications that `_.clone` supports */ - var cloneableClasses = {}; - cloneableClasses[funcClass] = false; - cloneableClasses[argsClass] = cloneableClasses[arrayClass] = - cloneableClasses[boolClass] = cloneableClasses[dateClass] = - cloneableClasses[numberClass] = cloneableClasses[objectClass] = - cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true; - - /** Used to lookup a built-in constructor by [[Class]] */ - var ctorByClass = {}; - ctorByClass[arrayClass] = Array; - ctorByClass[boolClass] = Boolean; - ctorByClass[dateClass] = Date; - ctorByClass[objectClass] = Object; - ctorByClass[numberClass] = Number; - ctorByClass[regexpClass] = RegExp; - ctorByClass[stringClass] = String; - - /** Used to determine if values are of the language type Object */ - var objectTypes = { - 'boolean': false, - 'function': true, - 'object': true, - 'number': false, - 'string': false, - 'undefined': false - }; - - /** Used to escape characters for inclusion in compiled string literals */ - var stringEscapes = { - '\\': '\\', - "'": "'", - '\n': 'n', - '\r': 'r', - '\t': 't', - '\u2028': 'u2028', - '\u2029': 'u2029' - }; - - /*--------------------------------------------------------------------------*/ - - /** - * Creates a `lodash` object, that wraps the given `value`, to enable - * method chaining. - * - * The chainable wrapper functions are: - * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, `compose`, - * `concat`, `countBy`, `debounce`, `defaults`, `defer`, `delay`, `difference`, - * `filter`, `flatten`, `forEach`, `forIn`, `forOwn`, `functions`, `groupBy`, - * `initial`, `intersection`, `invert`, `invoke`, `keys`, `map`, `max`, `memoize`, - * `merge`, `min`, `object`, `omit`, `once`, `pairs`, `partial`, `pick`, `pluck`, - * `push`, `range`, `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, - * `sortBy`, `splice`, `tap`, `throttle`, `times`, `toArray`, `union`, `uniq`, - * `unshift`, `values`, `where`, `without`, `wrap`, and `zip` - * - * The non-chainable wrapper functions are: - * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`, `identity`, - * `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`, `isEmpty`, - * `isEqual`, `isFinite`, `isFunction`, `isNaN`, `isNull`, `isNumber`, `isObject`, - * `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `join`, `lastIndexOf`, - * `mixin`, `noConflict`, `pop`, `random`, `reduce`, `reduceRight`, `result`, - * `shift`, `size`, `some`, `sortedIndex`, `template`, `unescape`, and `uniqueId` - * - * The wrapper functions `first` and `last` return wrapped values when `n` is - * passed, otherwise they return unwrapped values. - * - * @name _ - * @constructor - * @category Chaining - * @param {Mixed} value The value to wrap in a `lodash` instance. - * @returns {Object} Returns a `lodash` instance. - */ - function lodash(value) { - // exit early if already wrapped, even if wrapped by a different `lodash` constructor - if (value && typeof value == 'object' && value.__wrapped__) { - return value; - } - // allow invoking `lodash` without the `new` operator - if (!(this instanceof lodash)) { - return new lodash(value); - } - this.__wrapped__ = value; - } - - /** - * By default, the template delimiters used by Lo-Dash are similar to those in - * embedded Ruby (ERB). Change the following template settings to use alternative - * delimiters. - * - * @static - * @memberOf _ - * @type Object - */ - lodash.templateSettings = { - /** - * Used to detect `data` property values to be HTML-escaped. + * Checks if `value` is less than `other`. * * @static - * @memberOf _.templateSettings - * @type RegExp + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is less than `other`, + * else `false`. + * @see _.gt + * @example + * + * _.lt(1, 3); + * // => true + * + * _.lt(3, 3); + * // => false + * + * _.lt(3, 1); + * // => false */ - 'escape': /<%-([\s\S]+?)%>/g, + var lt = createRelationalOperation(baseLt); /** - * Used to detect code to be evaluated. + * Checks if `value` is less than or equal to `other`. * * @static - * @memberOf _.templateSettings - * @type RegExp + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is less than or equal to + * `other`, else `false`. + * @see _.gte + * @example + * + * _.lte(1, 3); + * // => true + * + * _.lte(3, 3); + * // => true + * + * _.lte(3, 1); + * // => false */ - 'evaluate': /<%([\s\S]+?)%>/g, + var lte = createRelationalOperation(function(value, other) { + return value <= other; + }); /** - * Used to detect `data` property values to inject. + * Converts `value` to an array. * * @static - * @memberOf _.templateSettings - * @type RegExp + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to convert. + * @returns {Array} Returns the converted array. + * @example + * + * _.toArray({ 'a': 1, 'b': 2 }); + * // => [1, 2] + * + * _.toArray('abc'); + * // => ['a', 'b', 'c'] + * + * _.toArray(1); + * // => [] + * + * _.toArray(null); + * // => [] */ - 'interpolate': reInterpolate, + function toArray(value) { + if (!value) { + return []; + } + if (isArrayLike(value)) { + return isString(value) ? stringToArray(value) : copyArray(value); + } + if (symIterator && value[symIterator]) { + return iteratorToArray(value[symIterator]()); + } + var tag = getTag(value), + func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values); + + return func(value); + } /** - * Used to reference the data object in the template text. + * Converts `value` to a finite number. * * @static - * @memberOf _.templateSettings - * @type String + * @memberOf _ + * @since 4.12.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted number. + * @example + * + * _.toFinite(3.2); + * // => 3.2 + * + * _.toFinite(Number.MIN_VALUE); + * // => 5e-324 + * + * _.toFinite(Infinity); + * // => 1.7976931348623157e+308 + * + * _.toFinite('3.2'); + * // => 3.2 */ - 'variable': '' - }; - - /*--------------------------------------------------------------------------*/ - - /** - * The template used to create iterator functions. - * - * @private - * @param {Obect} data The data object used to populate the text. - * @returns {String} Returns the interpolated text. - */ - var iteratorTemplate = template( - // conditional strict mode - "<% if (obj.useStrict) { %>'use strict';\n<% } %>" + - - // the `iteratee` may be reassigned by the `top` snippet - 'var index, iteratee = <%= firstArg %>, ' + - // assign the `result` variable an initial value - 'result = <%= firstArg %>;\n' + - // exit early if the first argument is falsey - 'if (!<%= firstArg %>) return result;\n' + - // add code before the iteration branches - '<%= top %>;\n' + - - // array-like iteration: - '<% if (arrayLoop) { %>' + - 'var length = iteratee.length; index = -1;\n' + - "if (typeof length == 'number') {" + - - // add support for accessing string characters by index if needed - ' <% if (noCharByIndex) { %>\n' + - ' if (isString(iteratee)) {\n' + - " iteratee = iteratee.split('')\n" + - ' }' + - ' <% } %>\n' + - - // iterate over the array-like value - ' while (++index < length) {\n' + - ' <%= arrayLoop %>\n' + - ' }\n' + - '}\n' + - 'else {' + - - // object iteration: - // add support for iterating over `arguments` objects if needed - ' <% } else if (nonEnumArgs) { %>\n' + - ' var length = iteratee.length; index = -1;\n' + - ' if (length && isArguments(iteratee)) {\n' + - ' while (++index < length) {\n' + - " index += '';\n" + - ' <%= objectLoop %>\n' + - ' }\n' + - ' } else {' + - ' <% } %>' + - - // Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1 - // (if the prototype or a property on the prototype has been set) - // incorrectly sets a function's `prototype` property [[Enumerable]] - // value to `true`. Because of this Lo-Dash standardizes on skipping - // the the `prototype` property of functions regardless of its - // [[Enumerable]] value. - ' <% if (!hasDontEnumBug) { %>\n' + - " var skipProto = typeof iteratee == 'function' && \n" + - " propertyIsEnumerable.call(iteratee, 'prototype');\n" + - ' <% } %>' + - - // iterate own properties using `Object.keys` if it's fast - ' <% if (isKeysFast && useHas) { %>\n' + - ' var ownIndex = -1,\n' + - ' ownProps = objectTypes[typeof iteratee] ? nativeKeys(iteratee) : [],\n' + - ' length = ownProps.length;\n\n' + - ' while (++ownIndex < length) {\n' + - ' index = ownProps[ownIndex];\n' + - " <% if (!hasDontEnumBug) { %>if (!(skipProto && index == 'prototype')) {\n <% } %>" + - ' <%= objectLoop %>\n' + - ' <% if (!hasDontEnumBug) { %>}\n<% } %>' + - ' }' + - - // else using a for-in loop - ' <% } else { %>\n' + - ' for (index in iteratee) {<%' + - ' if (!hasDontEnumBug || useHas) { %>\n if (<%' + - " if (!hasDontEnumBug) { %>!(skipProto && index == 'prototype')<% }" + - ' if (!hasDontEnumBug && useHas) { %> && <% }' + - ' if (useHas) { %>hasOwnProperty.call(iteratee, index)<% }' + - ' %>) {' + - ' <% } %>\n' + - ' <%= objectLoop %>;' + - ' <% if (!hasDontEnumBug || useHas) { %>\n }<% } %>\n' + - ' }' + - ' <% } %>' + - - // Because IE < 9 can't set the `[[Enumerable]]` attribute of an - // existing property and the `constructor` property of a prototype - // defaults to non-enumerable, Lo-Dash skips the `constructor` - // property when it infers it's iterating over a `prototype` object. - ' <% if (hasDontEnumBug) { %>\n\n' + - ' var ctor = iteratee.constructor;\n' + - ' <% for (var k = 0; k < 7; k++) { %>\n' + - " index = '<%= shadowed[k] %>';\n" + - ' if (<%' + - " if (shadowed[k] == 'constructor') {" + - ' %>!(ctor && ctor.prototype === iteratee) && <%' + - ' } %>hasOwnProperty.call(iteratee, index)) {\n' + - ' <%= objectLoop %>\n' + - ' }' + - ' <% } %>' + - ' <% } %>' + - ' <% if (arrayLoop || nonEnumArgs) { %>\n}<% } %>\n' + - - // add code to the bottom of the iteration function - '<%= bottom %>;\n' + - // finally, return the `result` - 'return result' - ); - - /** Reusable iterator options for `assign` and `defaults` */ - var assignIteratorOptions = { - 'args': 'object, source, guard', - 'top': - "for (var argsIndex = 1, argsLength = typeof guard == 'number' ? 2 : arguments.length; argsIndex < argsLength; argsIndex++) {\n" + - ' if ((iteratee = arguments[argsIndex])) {', - 'objectLoop': 'result[index] = iteratee[index]', - 'bottom': ' }\n}' - }; - - /** - * Reusable iterator options shared by `each`, `forIn`, and `forOwn`. - */ - var eachIteratorOptions = { - 'args': 'collection, callback, thisArg', - 'top': "callback = callback && typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg)", - 'arrayLoop': 'if (callback(iteratee[index], index, collection) === false) return result', - 'objectLoop': 'if (callback(iteratee[index], index, collection) === false) return result' - }; - - /** Reusable iterator options for `forIn` and `forOwn` */ - var forOwnIteratorOptions = { - 'arrayLoop': null - }; - - /*--------------------------------------------------------------------------*/ - - /** - * Creates a function optimized to search large arrays for a given `value`, - * starting at `fromIndex`, using strict equality for comparisons, i.e. `===`. - * - * @private - * @param {Array} array The array to search. - * @param {Mixed} value The value to search for. - * @param {Number} [fromIndex=0] The index to search from. - * @param {Number} [largeSize=30] The length at which an array is considered large. - * @returns {Boolean} Returns `true` if `value` is found, else `false`. - */ - function cachedContains(array, fromIndex, largeSize) { - fromIndex || (fromIndex = 0); - - var length = array.length, - isLarge = (length - fromIndex) >= (largeSize || largeArraySize); - - if (isLarge) { - var cache = {}, - index = fromIndex - 1; - - while (++index < length) { - // manually coerce `value` to a string because `hasOwnProperty`, in some - // older versions of Firefox, coerces objects incorrectly - var key = array[index] + ''; - (hasOwnProperty.call(cache, key) ? cache[key] : (cache[key] = [])).push(array[index]); + function toFinite(value) { + if (!value) { + return value === 0 ? value : 0; } - } - return function(value) { - if (isLarge) { - var key = value + ''; - return hasOwnProperty.call(cache, key) && indexOf(cache[key], value) > -1; + value = toNumber(value); + if (value === INFINITY || value === -INFINITY) { + var sign = (value < 0 ? -1 : 1); + return sign * MAX_INTEGER; } - return indexOf(array, value, fromIndex) > -1; + return value === value ? value : 0; } - } - - /** - * Used by `_.max` and `_.min` as the default `callback` when a given - * `collection` is a string value. - * - * @private - * @param {String} value The character to inspect. - * @returns {Number} Returns the code unit of given character. - */ - function charAtCallback(value) { - return value.charCodeAt(0); - } - - /** - * Used by `sortBy` to compare transformed `collection` values, stable sorting - * them in ascending order. - * - * @private - * @param {Object} a The object to compare to `b`. - * @param {Object} b The object to compare to `a`. - * @returns {Number} Returns the sort order indicator of `1` or `-1`. - */ - function compareAscending(a, b) { - var ai = a.index, - bi = b.index; - a = a.criteria; - b = b.criteria; + /** + * Converts `value` to an integer. + * + * **Note:** This method is loosely based on + * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted integer. + * @example + * + * _.toInteger(3.2); + * // => 3 + * + * _.toInteger(Number.MIN_VALUE); + * // => 0 + * + * _.toInteger(Infinity); + * // => 1.7976931348623157e+308 + * + * _.toInteger('3.2'); + * // => 3 + */ + function toInteger(value) { + var result = toFinite(value), + remainder = result % 1; - // ensure a stable sort in V8 and other engines - // http://code.google.com/p/v8/issues/detail?id=90 - if (a !== b) { - if (a > b || typeof a == 'undefined') { - return 1; - } - if (a < b || typeof b == 'undefined') { - return -1; - } + return result === result ? (remainder ? result - remainder : result) : 0; } - return ai < bi ? -1 : 1; - } - - /** - * Creates a function that, when called, invokes `func` with the `this` - * binding of `thisArg` and prepends any `partailArgs` to the arguments passed - * to the bound function. - * - * @private - * @param {Function|String} func The function to bind or the method name. - * @param {Mixed} [thisArg] The `this` binding of `func`. - * @param {Array} partialArgs An array of arguments to be partially applied. - * @returns {Function} Returns the new bound function. - */ - function createBound(func, thisArg, partialArgs) { - var isFunc = isFunction(func), - isPartial = !partialArgs, - key = thisArg; - // juggle arguments - if (isPartial) { - partialArgs = thisArg; - } - if (!isFunc) { - thisArg = func; + /** + * Converts `value` to an integer suitable for use as the length of an + * array-like object. + * + * **Note:** This method is based on + * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted integer. + * @example + * + * _.toLength(3.2); + * // => 3 + * + * _.toLength(Number.MIN_VALUE); + * // => 0 + * + * _.toLength(Infinity); + * // => 4294967295 + * + * _.toLength('3.2'); + * // => 3 + */ + function toLength(value) { + return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0; } - function bound() { - // `Function#bind` spec - // http://es5.github.com/#x15.3.4.5 - var args = arguments, - thisBinding = isPartial ? this : thisArg; - - if (!isFunc) { - func = thisArg[key]; + /** + * Converts `value` to a number. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to process. + * @returns {number} Returns the number. + * @example + * + * _.toNumber(3.2); + * // => 3.2 + * + * _.toNumber(Number.MIN_VALUE); + * // => 5e-324 + * + * _.toNumber(Infinity); + * // => Infinity + * + * _.toNumber('3.2'); + * // => 3.2 + */ + function toNumber(value) { + if (typeof value == 'number') { + return value; } - if (partialArgs.length) { - args = args.length - ? partialArgs.concat(slice(args)) - : partialArgs; + if (isSymbol(value)) { + return NAN; } - if (this instanceof bound) { - // ensure `new bound` is an instance of `bound` and `func` - noop.prototype = func.prototype; - thisBinding = new noop; - noop.prototype = null; - - // mimic the constructor's `return` behavior - // http://es5.github.com/#x13.2.2 - var result = func.apply(thisBinding, args); - return isObject(result) ? result : thisBinding; + if (isObject(value)) { + var other = typeof value.valueOf == 'function' ? value.valueOf() : value; + value = isObject(other) ? (other + '') : other; } - return func.apply(thisBinding, args); - } - return bound; - } - - /** - * Produces an iteration callback bound to an optional `thisArg`. If `func` is - * a property name, the callback will return the property value for a given element. - * - * @private - * @param {Function|String} [func=identity|property] The function called per - * iteration or property name to query. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @param {Object} [accumulating] Used to indicate that the callback should - * accept an `accumulator` argument. - * @returns {Function} Returns a callback function. - */ - function createCallback(func, thisArg, accumulating) { - if (!func) { - return identity; - } - if (typeof func != 'function') { - return function(object) { - return object[func]; - }; - } - if (typeof thisArg != 'undefined') { - if (accumulating) { - return function(accumulator, value, index, object) { - return func.call(thisArg, accumulator, value, index, object); - }; + if (typeof value != 'string') { + return value === 0 ? value : +value; } - return function(value, index, object) { - return func.call(thisArg, value, index, object); - }; + value = value.replace(reTrim, ''); + var isBinary = reIsBinary.test(value); + return (isBinary || reIsOctal.test(value)) + ? freeParseInt(value.slice(2), isBinary ? 2 : 8) + : (reIsBadHex.test(value) ? NAN : +value); } - return func; - } - /** - * Creates compiled iteration functions. - * - * @private - * @param {Object} [options1, options2, ...] The compile options object(s). - * useHas - A boolean to specify using `hasOwnProperty` checks in the object loop. - * args - A string of comma separated arguments the iteration function will accept. - * top - A string of code to execute before the iteration branches. - * arrayLoop - A string of code to execute in the array loop. - * objectLoop - A string of code to execute in the object loop. - * bottom - A string of code to execute after the iteration branches. - * - * @returns {Function} Returns the compiled function. - */ - function createIterator() { - var data = { - 'arrayLoop': '', - 'bottom': '', - 'hasDontEnumBug': hasDontEnumBug, - 'isKeysFast': isKeysFast, - 'objectLoop': '', - 'nonEnumArgs': nonEnumArgs, - 'noCharByIndex': noCharByIndex, - 'shadowed': shadowed, - 'top': '', - 'useHas': true - }; - - // merge options into a template data object - for (var object, index = 0; object = arguments[index]; index++) { - for (var key in object) { - data[key] = object[key]; - } + /** + * Converts `value` to a plain object flattening inherited enumerable string + * keyed properties of `value` to own properties of the plain object. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {Object} Returns the converted plain object. + * @example + * + * function Foo() { + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.assign({ 'a': 1 }, new Foo); + * // => { 'a': 1, 'b': 2 } + * + * _.assign({ 'a': 1 }, _.toPlainObject(new Foo)); + * // => { 'a': 1, 'b': 2, 'c': 3 } + */ + function toPlainObject(value) { + return copyObject(value, keysIn(value)); } - var args = data.args; - data.firstArg = /^[^,]+/.exec(args)[0]; - // create the function factory - var factory = Function( - 'createCallback, hasOwnProperty, isArguments, isString, objectTypes, ' + - 'nativeKeys, propertyIsEnumerable', - 'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}' - ); - // return the compiled function - return factory( - createCallback, hasOwnProperty, isArguments, isString, objectTypes, - nativeKeys, propertyIsEnumerable - ); - } - - /** - * A function compiled to iterate `arguments` objects, arrays, objects, and - * strings consistenly across environments, executing the `callback` for each - * element in the `collection`. The `callback` is bound to `thisArg` and invoked - * with three arguments; (value, index|key, collection). Callbacks may exit - * iteration early by explicitly returning `false`. - * - * @private - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array|Object|String} Returns `collection`. - */ - var each = createIterator(eachIteratorOptions); - - /** - * Used by `template` to escape characters for inclusion in compiled - * string literals. - * - * @private - * @param {String} match The matched character to escape. - * @returns {String} Returns the escaped character. - */ - function escapeStringChar(match) { - return '\\' + stringEscapes[match]; - } - - /** - * Used by `escape` to convert characters to HTML entities. - * - * @private - * @param {String} match The matched character to escape. - * @returns {String} Returns the escaped character. - */ - function escapeHtmlChar(match) { - return htmlEscapes[match]; - } - - /** - * Checks if `value` is a DOM node in IE < 9. - * - * @private - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a DOM node, else `false`. - */ - function isNode(value) { - // IE < 9 presents DOM nodes as `Object` objects except they have `toString` - // methods that are `typeof` "string" and still can coerce nodes to strings - return typeof value.toString != 'function' && typeof (value + '') == 'string'; - } - - /** - * A no-operation function. - * - * @private - */ - function noop() { - // no operation performed - } - - /** - * Slices the `collection` from the `start` index up to, but not including, - * the `end` index. - * - * Note: This function is used, instead of `Array#slice`, to support node lists - * in IE < 9 and to ensure dense arrays are returned. - * - * @private - * @param {Array|Object|String} collection The collection to slice. - * @param {Number} start The start index. - * @param {Number} end The end index. - * @returns {Array} Returns the new array. - */ - function slice(array, start, end) { - start || (start = 0); - if (typeof end == 'undefined') { - end = array ? array.length : 0; + /** + * Converts `value` to a safe integer. A safe integer can be compared and + * represented correctly. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted integer. + * @example + * + * _.toSafeInteger(3.2); + * // => 3 + * + * _.toSafeInteger(Number.MIN_VALUE); + * // => 0 + * + * _.toSafeInteger(Infinity); + * // => 9007199254740991 + * + * _.toSafeInteger('3.2'); + * // => 3 + */ + function toSafeInteger(value) { + return value + ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER) + : (value === 0 ? value : 0); } - var index = -1, - length = end - start || 0, - result = Array(length < 0 ? 0 : length); - while (++index < length) { - result[index] = array[start + index]; + /** + * Converts `value` to a string. An empty string is returned for `null` + * and `undefined` values. The sign of `-0` is preserved. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {string} Returns the converted string. + * @example + * + * _.toString(null); + * // => '' + * + * _.toString(-0); + * // => '-0' + * + * _.toString([1, 2, 3]); + * // => '1,2,3' + */ + function toString(value) { + return value == null ? '' : baseToString(value); } - return result; - } - /** - * Used by `unescape` to convert HTML entities to characters. - * - * @private - * @param {String} match The matched character to unescape. - * @returns {String} Returns the unescaped character. - */ - function unescapeHtmlChar(match) { - return htmlUnescapes[match]; - } + /*------------------------------------------------------------------------*/ - /*--------------------------------------------------------------------------*/ + /** + * Assigns own enumerable string keyed properties of source objects to the + * destination object. Source objects are applied from left to right. + * Subsequent sources overwrite property assignments of previous sources. + * + * **Note:** This method mutates `object` and is loosely based on + * [`Object.assign`](https://mdn.io/Object/assign). + * + * @static + * @memberOf _ + * @since 0.10.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.assignIn + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * function Bar() { + * this.c = 3; + * } + * + * Foo.prototype.b = 2; + * Bar.prototype.d = 4; + * + * _.assign({ 'a': 0 }, new Foo, new Bar); + * // => { 'a': 1, 'c': 3 } + */ + var assign = createAssigner(function(object, source) { + if (isPrototype(source) || isArrayLike(source)) { + copyObject(source, keys(source), object); + return; + } + for (var key in source) { + if (hasOwnProperty.call(source, key)) { + assignValue(object, key, source[key]); + } + } + }); - /** - * Assigns own enumerable properties of source object(s) to the `destination` - * object. Subsequent sources will overwrite propery assignments of previous - * sources. - * - * @static - * @memberOf _ - * @alias extend - * @category Objects - * @param {Object} object The destination object. - * @param {Object} [source1, source2, ...] The source objects. - * @returns {Object} Returns the destination object. - * @example - * - * _.assign({ 'name': 'moe' }, { 'age': 40 }); - * // => { 'name': 'moe', 'age': 40 } - */ - var assign = createIterator(assignIteratorOptions); + /** + * This method is like `_.assign` except that it iterates over own and + * inherited source properties. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias extend + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.assign + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * function Bar() { + * this.c = 3; + * } + * + * Foo.prototype.b = 2; + * Bar.prototype.d = 4; + * + * _.assignIn({ 'a': 0 }, new Foo, new Bar); + * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 } + */ + var assignIn = createAssigner(function(object, source) { + copyObject(source, keysIn(source), object); + }); - /** - * Checks if `value` is an `arguments` object. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is an `arguments` object, else `false`. - * @example - * - * (function() { return _.isArguments(arguments); })(1, 2, 3); - * // => true - * - * _.isArguments([1, 2, 3]); - * // => false - */ - function isArguments(value) { - return toString.call(value) == argsClass; - } - // fallback for browsers that can't detect `arguments` objects by [[Class]] - if (noArgsClass) { - isArguments = function(value) { - return value ? hasOwnProperty.call(value, 'callee') : false; - }; - } + /** + * This method is like `_.assignIn` except that it accepts `customizer` + * which is invoked to produce the assigned values. If `customizer` returns + * `undefined`, assignment is handled by the method instead. The `customizer` + * is invoked with five arguments: (objValue, srcValue, key, object, source). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias extendWith + * @category Object + * @param {Object} object The destination object. + * @param {...Object} sources The source objects. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @see _.assignWith + * @example + * + * function customizer(objValue, srcValue) { + * return _.isUndefined(objValue) ? srcValue : objValue; + * } + * + * var defaults = _.partialRight(_.assignInWith, customizer); + * + * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); + * // => { 'a': 1, 'b': 2 } + */ + var assignInWith = createAssigner(function(object, source, srcIndex, customizer) { + copyObject(source, keysIn(source), object, customizer); + }); - /** - * Iterates over `object`'s own and inherited enumerable properties, executing - * the `callback` for each property. The `callback` is bound to `thisArg` and - * invoked with three arguments; (value, key, object). Callbacks may exit iteration - * early by explicitly returning `false`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns `object`. - * @example - * - * function Dog(name) { - * this.name = name; - * } - * - * Dog.prototype.bark = function() { - * alert('Woof, woof!'); - * }; - * - * _.forIn(new Dog('Dagny'), function(value, key) { - * alert(key); - * }); - * // => alerts 'name' and 'bark' (order is not guaranteed) - */ - var forIn = createIterator(eachIteratorOptions, forOwnIteratorOptions, { - 'useHas': false - }); + /** + * This method is like `_.assign` except that it accepts `customizer` + * which is invoked to produce the assigned values. If `customizer` returns + * `undefined`, assignment is handled by the method instead. The `customizer` + * is invoked with five arguments: (objValue, srcValue, key, object, source). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} sources The source objects. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @see _.assignInWith + * @example + * + * function customizer(objValue, srcValue) { + * return _.isUndefined(objValue) ? srcValue : objValue; + * } + * + * var defaults = _.partialRight(_.assignWith, customizer); + * + * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); + * // => { 'a': 1, 'b': 2 } + */ + var assignWith = createAssigner(function(object, source, srcIndex, customizer) { + copyObject(source, keys(source), object, customizer); + }); - /** - * Iterates over an object's own enumerable properties, executing the `callback` - * for each property. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, key, object). Callbacks may exit iteration early by explicitly - * returning `false`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns `object`. - * @example - * - * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { - * alert(key); - * }); - * // => alerts '0', '1', and 'length' (order is not guaranteed) - */ - var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions); + /** + * Creates an array of values corresponding to `paths` of `object`. + * + * @static + * @memberOf _ + * @since 1.0.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {...(string|string[])} [paths] The property paths to pick. + * @returns {Array} Returns the picked values. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] }; + * + * _.at(object, ['a[0].b.c', 'a[1]']); + * // => [3, 4] + */ + var at = flatRest(baseAt); - /** - * A fallback implementation of `isPlainObject` that checks if a given `value` - * is an object created by the `Object` constructor, assuming objects created - * by the `Object` constructor have no inherited enumerable properties and that - * there are no `Object.prototype` extensions. - * - * @private - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if `value` is a plain object, else `false`. - */ - function shimIsPlainObject(value) { - // avoid non-objects and false positives for `arguments` objects - var result = false; - if (!(value && typeof value == 'object') || isArguments(value)) { - return result; - } - // check that the constructor is `Object` (i.e. `Object instanceof Object`) - var ctor = value.constructor; - if ((!isFunction(ctor) && (!noNodeClass || !isNode(value))) || ctor instanceof ctor) { - // IE < 9 iterates inherited properties before own properties. If the first - // iterated property is an object's own property then there are no inherited - // enumerable properties. - if (iteratesOwnLast) { - forIn(value, function(value, key, object) { - result = !hasOwnProperty.call(object, key); - return false; - }); - return result === false; - } - // In most environments an object's own properties are iterated before - // its inherited properties. If the last iterated property is an object's - // own property then there are no inherited enumerable properties. - forIn(value, function(value, key) { - result = key; - }); - return result === false || hasOwnProperty.call(value, result); + /** + * Creates an object that inherits from the `prototype` object. If a + * `properties` object is given, its own enumerable string keyed properties + * are assigned to the created object. + * + * @static + * @memberOf _ + * @since 2.3.0 + * @category Object + * @param {Object} prototype The object to inherit from. + * @param {Object} [properties] The properties to assign to the object. + * @returns {Object} Returns the new object. + * @example + * + * function Shape() { + * this.x = 0; + * this.y = 0; + * } + * + * function Circle() { + * Shape.call(this); + * } + * + * Circle.prototype = _.create(Shape.prototype, { + * 'constructor': Circle + * }); + * + * var circle = new Circle; + * circle instanceof Circle; + * // => true + * + * circle instanceof Shape; + * // => true + */ + function create(prototype, properties) { + var result = baseCreate(prototype); + return properties == null ? result : baseAssign(result, properties); } - return result; - } - /** - * A fallback implementation of `Object.keys` that produces an array of the - * given object's own enumerable property names. - * - * @private - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property names. - */ - function shimKeys(object) { - var result = []; - forOwn(object, function(value, key) { - result.push(key); + /** + * Assigns own and inherited enumerable string keyed properties of source + * objects to the destination object for all destination properties that + * resolve to `undefined`. Source objects are applied from left to right. + * Once a property is set, additional values of the same property are ignored. + * + * **Note:** This method mutates `object`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.defaultsDeep + * @example + * + * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); + * // => { 'a': 1, 'b': 2 } + */ + var defaults = baseRest(function(args) { + args.push(undefined, customDefaultsAssignIn); + return apply(assignInWith, undefined, args); }); - return result; - } - - /** - * Used to convert characters to HTML entities: - * - * Though the `>` character is escaped for symmetry, characters like `>` and `/` - * don't require escaping in HTML and have no special meaning unless they're part - * of a tag or an unquoted attribute value. - * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact") - */ - var htmlEscapes = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - "'": ''' - }; - - /** Used to convert HTML entities to characters */ - var htmlUnescapes = invert(htmlEscapes); - /*--------------------------------------------------------------------------*/ + /** + * This method is like `_.defaults` except that it recursively assigns + * default properties. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 3.10.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.defaults + * @example + * + * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } }); + * // => { 'a': { 'b': 2, 'c': 3 } } + */ + var defaultsDeep = baseRest(function(args) { + args.push(undefined, customDefaultsMerge); + return apply(mergeWith, undefined, args); + }); - /** - * Creates a clone of `value`. If `deep` is `true`, nested objects will also - * be cloned, otherwise they will be assigned by reference. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to clone. - * @param {Boolean} deep A flag to indicate a deep clone. - * @param- {Object} [guard] Internally used to allow this method to work with - * others like `_.map` without using their callback `index` argument for `deep`. - * @param- {Array} [stackA=[]] Internally used to track traversed source objects. - * @param- {Array} [stackB=[]] Internally used to associate clones with their - * source counterparts. - * @returns {Mixed} Returns the cloned `value`. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 }, - * { 'name': 'curly', 'age': 60 } - * ]; - * - * var shallow = _.clone(stooges); - * shallow[0] === stooges[0]; - * // => true - * - * var deep = _.clone(stooges, true); - * deep[0] === stooges[0]; - * // => false - */ - function clone(value, deep, guard, stackA, stackB) { - if (value == null) { - return value; - } - if (guard) { - deep = false; - } - // inspect [[Class]] - var isObj = isObject(value); - if (isObj) { - var className = toString.call(value); - if (!cloneableClasses[className] || (noNodeClass && isNode(value))) { - return value; - } - var isArr = isArray(value); - } - // shallow clone - if (!isObj || !deep) { - return isObj - ? (isArr ? slice(value) : assign({}, value)) - : value; + /** + * This method is like `_.find` except that it returns the key of the first + * element `predicate` returns truthy for instead of the element itself. + * + * @static + * @memberOf _ + * @since 1.1.0 + * @category Object + * @param {Object} object The object to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {string|undefined} Returns the key of the matched element, + * else `undefined`. + * @example + * + * var users = { + * 'barney': { 'age': 36, 'active': true }, + * 'fred': { 'age': 40, 'active': false }, + * 'pebbles': { 'age': 1, 'active': true } + * }; + * + * _.findKey(users, function(o) { return o.age < 40; }); + * // => 'barney' (iteration order is not guaranteed) + * + * // The `_.matches` iteratee shorthand. + * _.findKey(users, { 'age': 1, 'active': true }); + * // => 'pebbles' + * + * // The `_.matchesProperty` iteratee shorthand. + * _.findKey(users, ['active', false]); + * // => 'fred' + * + * // The `_.property` iteratee shorthand. + * _.findKey(users, 'active'); + * // => 'barney' + */ + function findKey(object, predicate) { + return baseFindKey(object, getIteratee(predicate, 3), baseForOwn); } - var ctor = ctorByClass[className]; - switch (className) { - case boolClass: - case dateClass: - return new ctor(+value); - - case numberClass: - case stringClass: - return new ctor(value); - case regexpClass: - return ctor(value.source, reFlags.exec(value)); + /** + * This method is like `_.findKey` except that it iterates over elements of + * a collection in the opposite order. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Object + * @param {Object} object The object to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {string|undefined} Returns the key of the matched element, + * else `undefined`. + * @example + * + * var users = { + * 'barney': { 'age': 36, 'active': true }, + * 'fred': { 'age': 40, 'active': false }, + * 'pebbles': { 'age': 1, 'active': true } + * }; + * + * _.findLastKey(users, function(o) { return o.age < 40; }); + * // => returns 'pebbles' assuming `_.findKey` returns 'barney' + * + * // The `_.matches` iteratee shorthand. + * _.findLastKey(users, { 'age': 36, 'active': true }); + * // => 'barney' + * + * // The `_.matchesProperty` iteratee shorthand. + * _.findLastKey(users, ['active', false]); + * // => 'fred' + * + * // The `_.property` iteratee shorthand. + * _.findLastKey(users, 'active'); + * // => 'pebbles' + */ + function findLastKey(object, predicate) { + return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight); } - // check for circular references and return corresponding clone - stackA || (stackA = []); - stackB || (stackB = []); - var length = stackA.length; - while (length--) { - if (stackA[length] == value) { - return stackB[length]; - } + /** + * Iterates over own and inherited enumerable string keyed properties of an + * object and invokes `iteratee` for each property. The iteratee is invoked + * with three arguments: (value, key, object). Iteratee functions may exit + * iteration early by explicitly returning `false`. + * + * @static + * @memberOf _ + * @since 0.3.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forInRight + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forIn(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed). + */ + function forIn(object, iteratee) { + return object == null + ? object + : baseFor(object, getIteratee(iteratee, 3), keysIn); } - // init cloned object - var result = isArr ? ctor(value.length) : {}; - // add the source value to the stack of traversed objects - // and associate it with its clone - stackA.push(value); - stackB.push(result); + /** + * This method is like `_.forIn` except that it iterates over properties of + * `object` in the opposite order. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forIn + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forInRight(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'. + */ + function forInRight(object, iteratee) { + return object == null + ? object + : baseForRight(object, getIteratee(iteratee, 3), keysIn); + } - // recursively populate clone (susceptible to call stack limits) - (isArr ? forEach : forOwn)(value, function(objValue, key) { - result[key] = clone(objValue, deep, null, stackA, stackB); - }); - - // add array properties assigned by `RegExp#exec` - if (isArr) { - if (hasOwnProperty.call(value, 'index')) { - result.index = value.index; - } - if (hasOwnProperty.call(value, 'input')) { - result.input = value.input; - } + /** + * Iterates over own enumerable string keyed properties of an object and + * invokes `iteratee` for each property. The iteratee is invoked with three + * arguments: (value, key, object). Iteratee functions may exit iteration + * early by explicitly returning `false`. + * + * @static + * @memberOf _ + * @since 0.3.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forOwnRight + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forOwn(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'a' then 'b' (iteration order is not guaranteed). + */ + function forOwn(object, iteratee) { + return object && baseForOwn(object, getIteratee(iteratee, 3)); } - return result; - } - /** - * Creates a deep clone of `value`. Functions and DOM nodes are **not** cloned. - * The enumerable properties of `arguments` objects and objects created by - * constructors other than `Object` are cloned to plain `Object` objects. - * - * Note: This function is loosely based on the structured clone algorithm. - * See http://www.w3.org/TR/html5/common-dom-interfaces.html#internal-structured-cloning-algorithm. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to deep clone. - * @returns {Mixed} Returns the deep cloned `value`. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 }, - * { 'name': 'curly', 'age': 60 } - * ]; - * - * var deep = _.cloneDeep(stooges); - * deep[0] === stooges[0]; - * // => false - */ - function cloneDeep(value) { - return clone(value, true); - } + /** + * This method is like `_.forOwn` except that it iterates over properties of + * `object` in the opposite order. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forOwn + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forOwnRight(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'. + */ + function forOwnRight(object, iteratee) { + return object && baseForOwnRight(object, getIteratee(iteratee, 3)); + } - /** - * Assigns own enumerable properties of source object(s) to the `destination` - * object for all `destination` properties that resolve to `null`/`undefined`. - * Once a property is set, additional defaults of the same property will be - * ignored. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The destination object. - * @param {Object} [default1, default2, ...] The default objects. - * @returns {Object} Returns the destination object. - * @example - * - * var iceCream = { 'flavor': 'chocolate' }; - * _.defaults(iceCream, { 'flavor': 'vanilla', 'sprinkles': 'rainbow' }); - * // => { 'flavor': 'chocolate', 'sprinkles': 'rainbow' } - */ - var defaults = createIterator(assignIteratorOptions, { - 'objectLoop': 'if (result[index] == null) ' + assignIteratorOptions.objectLoop - }); + /** + * Creates an array of function property names from own enumerable properties + * of `object`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to inspect. + * @returns {Array} Returns the function names. + * @see _.functionsIn + * @example + * + * function Foo() { + * this.a = _.constant('a'); + * this.b = _.constant('b'); + * } + * + * Foo.prototype.c = _.constant('c'); + * + * _.functions(new Foo); + * // => ['a', 'b'] + */ + function functions(object) { + return object == null ? [] : baseFunctions(object, keys(object)); + } - /** - * Creates a sorted array of all enumerable properties, own and inherited, - * of `object` that have function values. - * - * @static - * @memberOf _ - * @alias methods - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property names that have function values. - * @example - * - * _.functions(_); - * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...] - */ - function functions(object) { - var result = []; - forIn(object, function(value, key) { - if (isFunction(value)) { - result.push(key); - } - }); - return result.sort(); - } + /** + * Creates an array of function property names from own and inherited + * enumerable properties of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to inspect. + * @returns {Array} Returns the function names. + * @see _.functions + * @example + * + * function Foo() { + * this.a = _.constant('a'); + * this.b = _.constant('b'); + * } + * + * Foo.prototype.c = _.constant('c'); + * + * _.functionsIn(new Foo); + * // => ['a', 'b', 'c'] + */ + function functionsIn(object) { + return object == null ? [] : baseFunctions(object, keysIn(object)); + } - /** - * Checks if the specified object `property` exists and is a direct property, - * instead of an inherited property. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to check. - * @param {String} property The property to check for. - * @returns {Boolean} Returns `true` if key is a direct property, else `false`. - * @example - * - * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b'); - * // => true - */ - function has(object, property) { - return object ? hasOwnProperty.call(object, property) : false; - } + /** + * Gets the value at `path` of `object`. If the resolved value is + * `undefined`, the `defaultValue` is returned in its place. + * + * @static + * @memberOf _ + * @since 3.7.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the property to get. + * @param {*} [defaultValue] The value returned for `undefined` resolved values. + * @returns {*} Returns the resolved value. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * + * _.get(object, 'a[0].b.c'); + * // => 3 + * + * _.get(object, ['a', '0', 'b', 'c']); + * // => 3 + * + * _.get(object, 'a.b.c', 'default'); + * // => 'default' + */ + function get(object, path, defaultValue) { + var result = object == null ? undefined : baseGet(object, path); + return result === undefined ? defaultValue : result; + } - /** - * Creates an object composed of the inverted keys and values of the given `object`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to invert. - * @returns {Object} Returns the created inverted object. - * @example - * - * _.invert({ 'first': 'Moe', 'second': 'Larry', 'third': 'Curly' }); - * // => { 'Moe': 'first', 'Larry': 'second', 'Curly': 'third' } (order is not guaranteed) - */ - function invert(object) { - var result = {}; - forOwn(object, function(value, key) { - result[value] = key; - }); - return result; - } + /** + * Checks if `path` is a direct property of `object`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path to check. + * @returns {boolean} Returns `true` if `path` exists, else `false`. + * @example + * + * var object = { 'a': { 'b': 2 } }; + * var other = _.create({ 'a': _.create({ 'b': 2 }) }); + * + * _.has(object, 'a'); + * // => true + * + * _.has(object, 'a.b'); + * // => true + * + * _.has(object, ['a', 'b']); + * // => true + * + * _.has(other, 'a'); + * // => false + */ + function has(object, path) { + return object != null && hasPath(object, path, baseHas); + } - /** - * Checks if `value` is an array. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is an array, else `false`. - * @example - * - * (function() { return _.isArray(arguments); })(); - * // => false - * - * _.isArray([1, 2, 3]); - * // => true - */ - var isArray = nativeIsArray || function(value) { - // `instanceof` may cause a memory leak in IE 7 if `value` is a host object - // http://ajaxian.com/archives/working-aroung-the-instanceof-memory-leak - return (argsAreObjects && value instanceof Array) || toString.call(value) == arrayClass; - }; + /** + * Checks if `path` is a direct or inherited property of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path to check. + * @returns {boolean} Returns `true` if `path` exists, else `false`. + * @example + * + * var object = _.create({ 'a': _.create({ 'b': 2 }) }); + * + * _.hasIn(object, 'a'); + * // => true + * + * _.hasIn(object, 'a.b'); + * // => true + * + * _.hasIn(object, ['a', 'b']); + * // => true + * + * _.hasIn(object, 'b'); + * // => false + */ + function hasIn(object, path) { + return object != null && hasPath(object, path, baseHasIn); + } - /** - * Checks if `value` is a boolean (`true` or `false`) value. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a boolean value, else `false`. - * @example - * - * _.isBoolean(null); - * // => false - */ - function isBoolean(value) { - return value === true || value === false || toString.call(value) == boolClass; - } + /** + * Creates an object composed of the inverted keys and values of `object`. + * If `object` contains duplicate values, subsequent values overwrite + * property assignments of previous values. + * + * @static + * @memberOf _ + * @since 0.7.0 + * @category Object + * @param {Object} object The object to invert. + * @returns {Object} Returns the new inverted object. + * @example + * + * var object = { 'a': 1, 'b': 2, 'c': 1 }; + * + * _.invert(object); + * // => { '1': 'c', '2': 'b' } + */ + var invert = createInverter(function(result, value, key) { + result[value] = key; + }, constant(identity)); - /** - * Checks if `value` is a date. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a date, else `false`. - * @example - * - * _.isDate(new Date); - * // => true - */ - function isDate(value) { - return value instanceof Date || toString.call(value) == dateClass; - } + /** + * This method is like `_.invert` except that the inverted object is generated + * from the results of running each element of `object` thru `iteratee`. The + * corresponding inverted value of each inverted key is an array of keys + * responsible for generating the inverted value. The iteratee is invoked + * with one argument: (value). + * + * @static + * @memberOf _ + * @since 4.1.0 + * @category Object + * @param {Object} object The object to invert. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Object} Returns the new inverted object. + * @example + * + * var object = { 'a': 1, 'b': 2, 'c': 1 }; + * + * _.invertBy(object); + * // => { '1': ['a', 'c'], '2': ['b'] } + * + * _.invertBy(object, function(value) { + * return 'group' + value; + * }); + * // => { 'group1': ['a', 'c'], 'group2': ['b'] } + */ + var invertBy = createInverter(function(result, value, key) { + if (hasOwnProperty.call(result, value)) { + result[value].push(key); + } else { + result[value] = [key]; + } + }, getIteratee); - /** - * Checks if `value` is a DOM element. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a DOM element, else `false`. - * @example - * - * _.isElement(document.body); - * // => true - */ - function isElement(value) { - return value ? value.nodeType === 1 : false; - } + /** + * Invokes the method at `path` of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the method to invoke. + * @param {...*} [args] The arguments to invoke the method with. + * @returns {*} Returns the result of the invoked method. + * @example + * + * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] }; + * + * _.invoke(object, 'a[0].b.c.slice', 1, 3); + * // => [2, 3] + */ + var invoke = baseRest(baseInvoke); - /** - * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a - * length of `0` and objects with no own enumerable properties are considered - * "empty". - * - * @static - * @memberOf _ - * @category Objects - * @param {Array|Object|String} value The value to inspect. - * @returns {Boolean} Returns `true` if the `value` is empty, else `false`. - * @example - * - * _.isEmpty([1, 2, 3]); - * // => false - * - * _.isEmpty({}); - * // => true - * - * _.isEmpty(''); - * // => true - */ - function isEmpty(value) { - var result = true; - if (!value) { - return result; + /** + * Creates an array of the own enumerable property names of `object`. + * + * **Note:** Non-object values are coerced to objects. See the + * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys) + * for more details. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.keys(new Foo); + * // => ['a', 'b'] (iteration order is not guaranteed) + * + * _.keys('hi'); + * // => ['0', '1'] + */ + function keys(object) { + return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object); } - var className = toString.call(value), - length = value.length; - if ((className == arrayClass || className == stringClass || - className == argsClass || (noArgsClass && isArguments(value))) || - (className == objectClass && typeof length == 'number' && isFunction(value.splice))) { - return !length; + /** + * Creates an array of the own and inherited enumerable property names of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.keysIn(new Foo); + * // => ['a', 'b', 'c'] (iteration order is not guaranteed) + */ + function keysIn(object) { + return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object); } - forOwn(value, function() { - return (result = false); - }); - return result; - } - /** - * Performs a deep comparison between two values to determine if they are - * equivalent to each other. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} a The value to compare. - * @param {Mixed} b The other value to compare. - * @param- {Object} [stackA=[]] Internally used track traversed `a` objects. - * @param- {Object} [stackB=[]] Internally used track traversed `b` objects. - * @returns {Boolean} Returns `true` if the values are equvalent, else `false`. - * @example - * - * var moe = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] }; - * var clone = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] }; - * - * moe == clone; - * // => false - * - * _.isEqual(moe, clone); - * // => true - */ - function isEqual(a, b, stackA, stackB) { - // exit early for identical values - if (a === b) { - // treat `+0` vs. `-0` as not equal - return a !== 0 || (1 / a == 1 / b); - } - // a strict comparison is necessary because `null == undefined` - if (a == null || b == null) { - return a === b; - } - // compare [[Class]] names - var className = toString.call(a), - otherName = toString.call(b); + /** + * The opposite of `_.mapValues`; this method creates an object with the + * same values as `object` and keys generated by running each own enumerable + * string keyed property of `object` thru `iteratee`. The iteratee is invoked + * with three arguments: (value, key, object). + * + * @static + * @memberOf _ + * @since 3.8.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns the new mapped object. + * @see _.mapValues + * @example + * + * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) { + * return key + value; + * }); + * // => { 'a1': 1, 'b2': 2 } + */ + function mapKeys(object, iteratee) { + var result = {}; + iteratee = getIteratee(iteratee, 3); - if (className == argsClass) { - className = objectClass; - } - if (otherName == argsClass) { - otherName = objectClass; - } - if (className != otherName) { - return false; + baseForOwn(object, function(value, key, object) { + baseAssignValue(result, iteratee(value, key, object), value); + }); + return result; } - switch (className) { - case boolClass: - case dateClass: - // coerce dates and booleans to numbers, dates to milliseconds and booleans - // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal - return +a == +b; - - case numberClass: - // treat `NaN` vs. `NaN` as equal - return a != +a - ? b != +b - // but treat `+0` vs. `-0` as not equal - : (a == 0 ? (1 / a == 1 / b) : a == +b); - - case regexpClass: - case stringClass: - // coerce regexes to strings (http://es5.github.com/#x15.10.6.4) - // treat string primitives and their corresponding object instances as equal - return a == b + ''; - } - var isArr = className == arrayClass; - if (!isArr) { - // unwrap any `lodash` wrapped values - if (a.__wrapped__ || b.__wrapped__) { - return isEqual(a.__wrapped__ || a, b.__wrapped__ || b); - } - // exit for functions and DOM nodes - if (className != objectClass || (noNodeClass && (isNode(a) || isNode(b)))) { - return false; - } - // in older versions of Opera, `arguments` objects have `Array` constructors - var ctorA = !argsAreObjects && isArguments(a) ? Object : a.constructor, - ctorB = !argsAreObjects && isArguments(b) ? Object : b.constructor; - // non `Object` object instances with different constructors are not equal - if (ctorA != ctorB && !( - isFunction(ctorA) && ctorA instanceof ctorA && - isFunction(ctorB) && ctorB instanceof ctorB - )) { - return false; - } - } - // assume cyclic structures are equal - // the algorithm for detecting cyclic structures is adapted from ES 5.1 - // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3) - stackA || (stackA = []); - stackB || (stackB = []); + /** + * Creates an object with the same keys as `object` and values generated + * by running each own enumerable string keyed property of `object` thru + * `iteratee`. The iteratee is invoked with three arguments: + * (value, key, object). + * + * @static + * @memberOf _ + * @since 2.4.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns the new mapped object. + * @see _.mapKeys + * @example + * + * var users = { + * 'fred': { 'user': 'fred', 'age': 40 }, + * 'pebbles': { 'user': 'pebbles', 'age': 1 } + * }; + * + * _.mapValues(users, function(o) { return o.age; }); + * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) + * + * // The `_.property` iteratee shorthand. + * _.mapValues(users, 'age'); + * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) + */ + function mapValues(object, iteratee) { + var result = {}; + iteratee = getIteratee(iteratee, 3); - var length = stackA.length; - while (length--) { - if (stackA[length] == a) { - return stackB[length] == b; - } - } - var index = -1, - result = true, - size = 0; - - // add `a` and `b` to the stack of traversed objects - stackA.push(a); - stackB.push(b); - - // recursively compare objects and arrays (susceptible to call stack limits) - if (isArr) { - // compare lengths to determine if a deep comparison is necessary - size = a.length; - result = size == b.length; - - if (result) { - // deep compare the contents, ignoring non-numeric properties - while (size--) { - if (!(result = isEqual(a[size], b[size], stackA, stackB))) { - break; - } - } - } + baseForOwn(object, function(value, key, object) { + baseAssignValue(result, key, iteratee(value, key, object)); + }); return result; } - // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys` - // which, in this case, is more costly - forIn(a, function(value, key, a) { - if (hasOwnProperty.call(a, key)) { - // count the number of properties. - size++; - // deep compare each property value. - return (result = hasOwnProperty.call(b, key) && isEqual(value, b[key], stackA, stackB)); - } - }); - if (result) { - // ensure both objects have the same number of properties - forIn(b, function(value, key, b) { - if (hasOwnProperty.call(b, key)) { - // `size` will be `-1` if `b` has more properties than `a` - return (result = --size > -1); - } - }); - } - return result; - } - - /** - * Checks if `value` is, or can be coerced to, a finite number. - * - * Note: This is not the same as native `isFinite`, which will return true for - * booleans and empty strings. See http://es5.github.com/#x15.1.2.5. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a finite number, else `false`. - * @example - * - * _.isFinite(-101); - * // => true - * - * _.isFinite('10'); - * // => true - * - * _.isFinite(true); - * // => false - * - * _.isFinite(''); - * // => false - * - * _.isFinite(Infinity); - * // => false - */ - function isFinite(value) { - return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value)); - } - - /** - * Checks if `value` is a function. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a function, else `false`. - * @example - * - * _.isFunction(_); - * // => true - */ - function isFunction(value) { - return typeof value == 'function'; - } - // fallback for older versions of Chrome and Safari - if (isFunction(/x/)) { - isFunction = function(value) { - return value instanceof Function || toString.call(value) == funcClass; - }; - } - - /** - * Checks if `value` is the language type of Object. - * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is an object, else `false`. - * @example - * - * _.isObject({}); - * // => true - * - * _.isObject([1, 2, 3]); - * // => true - * - * _.isObject(1); - * // => false - */ - function isObject(value) { - // check if the value is the ECMAScript language type of Object - // http://es5.github.com/#x8 - // and avoid a V8 bug - // http://code.google.com/p/v8/issues/detail?id=2291 - return value ? objectTypes[typeof value] : false; - } - - /** - * Checks if `value` is `NaN`. - * - * Note: This is not the same as native `isNaN`, which will return `true` for - * `undefined` and other values. See http://es5.github.com/#x15.1.2.4. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is `NaN`, else `false`. - * @example - * - * _.isNaN(NaN); - * // => true - * - * _.isNaN(new Number(NaN)); - * // => true - * - * isNaN(undefined); - * // => true - * - * _.isNaN(undefined); - * // => false - */ - function isNaN(value) { - // `NaN` as a primitive is the only value that is not equal to itself - // (perform the [[Class]] check first to avoid errors with some host objects in IE) - return isNumber(value) && value != +value - } + /** + * This method is like `_.assign` except that it recursively merges own and + * inherited enumerable string keyed properties of source objects into the + * destination object. Source properties that resolve to `undefined` are + * skipped if a destination value exists. Array and plain object properties + * are merged recursively. Other objects and value types are overridden by + * assignment. Source objects are applied from left to right. Subsequent + * sources overwrite property assignments of previous sources. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 0.5.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @example + * + * var object = { + * 'a': [{ 'b': 2 }, { 'd': 4 }] + * }; + * + * var other = { + * 'a': [{ 'c': 3 }, { 'e': 5 }] + * }; + * + * _.merge(object, other); + * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] } + */ + var merge = createAssigner(function(object, source, srcIndex) { + baseMerge(object, source, srcIndex); + }); - /** - * Checks if `value` is `null`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is `null`, else `false`. - * @example - * - * _.isNull(null); - * // => true - * - * _.isNull(undefined); - * // => false - */ - function isNull(value) { - return value === null; - } + /** + * This method is like `_.merge` except that it accepts `customizer` which + * is invoked to produce the merged values of the destination and source + * properties. If `customizer` returns `undefined`, merging is handled by the + * method instead. The `customizer` is invoked with six arguments: + * (objValue, srcValue, key, object, source, stack). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} sources The source objects. + * @param {Function} customizer The function to customize assigned values. + * @returns {Object} Returns `object`. + * @example + * + * function customizer(objValue, srcValue) { + * if (_.isArray(objValue)) { + * return objValue.concat(srcValue); + * } + * } + * + * var object = { 'a': [1], 'b': [2] }; + * var other = { 'a': [3], 'b': [4] }; + * + * _.mergeWith(object, other, customizer); + * // => { 'a': [1, 3], 'b': [2, 4] } + */ + var mergeWith = createAssigner(function(object, source, srcIndex, customizer) { + baseMerge(object, source, srcIndex, customizer); + }); - /** - * Checks if `value` is a number. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a number, else `false`. - * @example - * - * _.isNumber(8.4 * 5); - * // => true - */ - function isNumber(value) { - return typeof value == 'number' || toString.call(value) == numberClass; - } + /** + * The opposite of `_.pick`; this method creates an object composed of the + * own and inherited enumerable property paths of `object` that are not omitted. + * + * **Note:** This method is considerably slower than `_.pick`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The source object. + * @param {...(string|string[])} [paths] The property paths to omit. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.omit(object, ['a', 'c']); + * // => { 'b': '2' } + */ + var omit = flatRest(function(object, paths) { + var result = {}; + if (object == null) { + return result; + } + var isDeep = false; + paths = arrayMap(paths, function(path) { + path = castPath(path, object); + isDeep || (isDeep = path.length > 1); + return path; + }); + copyObject(object, getAllKeysIn(object), result); + if (isDeep) { + result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone); + } + var length = paths.length; + while (length--) { + baseUnset(result, paths[length]); + } + return result; + }); - /** - * Checks if a given `value` is an object created by the `Object` constructor. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if `value` is a plain object, else `false`. - * @example - * - * function Stooge(name, age) { - * this.name = name; - * this.age = age; - * } - * - * _.isPlainObject(new Stooge('moe', 40)); - * // => false - * - * _.isPlainObject([1, 2, 3]); - * // => false - * - * _.isPlainObject({ 'name': 'moe', 'age': 40 }); - * // => true - */ - var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) { - if (!(value && typeof value == 'object')) { - return false; + /** + * The opposite of `_.pickBy`; this method creates an object composed of + * the own and inherited enumerable string keyed properties of `object` that + * `predicate` doesn't return truthy for. The predicate is invoked with two + * arguments: (value, key). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The source object. + * @param {Function} [predicate=_.identity] The function invoked per property. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.omitBy(object, _.isNumber); + * // => { 'b': '2' } + */ + function omitBy(object, predicate) { + return pickBy(object, negate(getIteratee(predicate))); } - var valueOf = value.valueOf, - objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto); - return objProto - ? value == objProto || (getPrototypeOf(value) == objProto && !isArguments(value)) - : shimIsPlainObject(value); - }; - - /** - * Checks if `value` is a regular expression. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a regular expression, else `false`. - * @example - * - * _.isRegExp(/moe/); - * // => true - */ - function isRegExp(value) { - return value instanceof RegExp || toString.call(value) == regexpClass; - } + /** + * Creates an object composed of the picked `object` properties. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The source object. + * @param {...(string|string[])} [paths] The property paths to pick. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.pick(object, ['a', 'c']); + * // => { 'a': 1, 'c': 3 } + */ + var pick = flatRest(function(object, paths) { + return object == null ? {} : basePick(object, paths); + }); - /** - * Checks if `value` is a string. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a string, else `false`. - * @example - * - * _.isString('moe'); - * // => true - */ - function isString(value) { - return typeof value == 'string' || toString.call(value) == stringClass; - } + /** + * Creates an object composed of the `object` properties `predicate` returns + * truthy for. The predicate is invoked with two arguments: (value, key). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The source object. + * @param {Function} [predicate=_.identity] The function invoked per property. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.pickBy(object, _.isNumber); + * // => { 'a': 1, 'c': 3 } + */ + function pickBy(object, predicate) { + if (object == null) { + return {}; + } + var props = arrayMap(getAllKeysIn(object), function(prop) { + return [prop]; + }); + predicate = getIteratee(predicate); + return basePickBy(object, props, function(value, path) { + return predicate(value, path[0]); + }); + } - /** - * Checks if `value` is `undefined`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is `undefined`, else `false`. - * @example - * - * _.isUndefined(void 0); - * // => true - */ - function isUndefined(value) { - return typeof value == 'undefined'; - } + /** + * This method is like `_.get` except that if the resolved value is a + * function it's invoked with the `this` binding of its parent object and + * its result is returned. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the property to resolve. + * @param {*} [defaultValue] The value returned for `undefined` resolved values. + * @returns {*} Returns the resolved value. + * @example + * + * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] }; + * + * _.result(object, 'a[0].b.c1'); + * // => 3 + * + * _.result(object, 'a[0].b.c2'); + * // => 4 + * + * _.result(object, 'a[0].b.c3', 'default'); + * // => 'default' + * + * _.result(object, 'a[0].b.c3', _.constant('default')); + * // => 'default' + */ + function result(object, path, defaultValue) { + path = castPath(path, object); - /** - * Creates an array composed of the own enumerable property names of `object`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property names. - * @example - * - * _.keys({ 'one': 1, 'two': 2, 'three': 3 }); - * // => ['one', 'two', 'three'] (order is not guaranteed) - */ - var keys = !nativeKeys ? shimKeys : function(object) { - // avoid iterating over the `prototype` property - return typeof object == 'function' && propertyIsEnumerable.call(object, 'prototype') - ? shimKeys(object) - : (isObject(object) ? nativeKeys(object) : []); - }; + var index = -1, + length = path.length; - /** - * Merges enumerable properties of the source object(s) into the `destination` - * object. Subsequent sources will overwrite propery assignments of previous - * sources. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The destination object. - * @param {Object} [source1, source2, ...] The source objects. - * @param- {Object} [indicator] Internally used to indicate that the `stack` - * argument is an array of traversed objects instead of another source object. - * @param- {Array} [stackA=[]] Internally used to track traversed source objects. - * @param- {Array} [stackB=[]] Internally used to associate values with their - * source counterparts. - * @returns {Object} Returns the destination object. - * @example - * - * var stooges = [ - * { 'name': 'moe' }, - * { 'name': 'larry' } - * ]; - * - * var ages = [ - * { 'age': 40 }, - * { 'age': 50 } - * ]; - * - * _.merge(stooges, ages); - * // => [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] - */ - function merge(object, source, indicator) { - var args = arguments, - index = 0, - length = 2, - stackA = args[3], - stackB = args[4]; - - if (indicator !== indicatorObject) { - stackA = []; - stackB = []; - - // work with `_.reduce` by only using its callback `accumulator` and `value` arguments - if (typeof indicator != 'number') { - length = args.length; + // Ensure the loop is entered when path is empty. + if (!length) { + length = 1; + object = undefined; } - } - while (++index < length) { - forOwn(args[index], function(source, key) { - var found, isArr, value; - if (source && ((isArr = isArray(source)) || isPlainObject(source))) { - // avoid merging previously merged cyclic sources - var stackLength = stackA.length; - while (stackLength--) { - found = stackA[stackLength] == source; - if (found) { - break; - } - } - if (found) { - object[key] = stackB[stackLength]; - } - else { - // add `source` and associated `value` to the stack of traversed objects - stackA.push(source); - stackB.push(value = (value = object[key], isArr) - ? (isArray(value) ? value : []) - : (isPlainObject(value) ? value : {}) - ); - // recursively merge objects and arrays (susceptible to call stack limits) - object[key] = merge(value, source, indicatorObject, stackA, stackB); - } - } else if (source != null) { - object[key] = source; + while (++index < length) { + var value = object == null ? undefined : object[toKey(path[index])]; + if (value === undefined) { + index = length; + value = defaultValue; } - }); + object = isFunction(value) ? value.call(object) : value; + } + return object; } - return object; - } - - /** - * Creates a shallow clone of `object` excluding the specified properties. - * Property names may be specified as individual arguments or as arrays of - * property names. If `callback` is passed, it will be executed for each property - * in the `object`, omitting the properties `callback` returns truthy for. The - * `callback` is bound to `thisArg` and invoked with three arguments; (value, key, object). - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The source object. - * @param {Function|String} callback|[prop1, prop2, ...] The properties to omit - * or the function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns an object without the omitted properties. - * @example - * - * _.omit({ 'name': 'moe', 'age': 40, 'userid': 'moe1' }, 'userid'); - * // => { 'name': 'moe', 'age': 40 } - * - * _.omit({ 'name': 'moe', '_hint': 'knucklehead', '_seed': '96c4eb' }, function(value, key) { - * return key.charAt(0) == '_'; - * }); - * // => { 'name': 'moe' } - */ - function omit(object, callback, thisArg) { - var isFunc = typeof callback == 'function', - result = {}; - if (isFunc) { - callback = createCallback(callback, thisArg); - } else { - var props = concat.apply(arrayRef, arguments); + /** + * Sets the value at `path` of `object`. If a portion of `path` doesn't exist, + * it's created. Arrays are created for missing index properties while objects + * are created for all other missing properties. Use `_.setWith` to customize + * `path` creation. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 3.7.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {*} value The value to set. + * @returns {Object} Returns `object`. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * + * _.set(object, 'a[0].b.c', 4); + * console.log(object.a[0].b.c); + * // => 4 + * + * _.set(object, ['x', '0', 'y', 'z'], 5); + * console.log(object.x[0].y.z); + * // => 5 + */ + function set(object, path, value) { + return object == null ? object : baseSet(object, path, value); } - forIn(object, function(value, key, object) { - if (isFunc - ? !callback(value, key, object) - : indexOf(props, key, 1) < 0 - ) { - result[key] = value; - } - }); - return result; - } - /** - * Creates a two dimensional array of the given object's key-value pairs, - * i.e. `[[key1, value1], [key2, value2]]`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns new array of key-value pairs. - * @example - * - * _.pairs({ 'moe': 30, 'larry': 40, 'curly': 50 }); - * // => [['moe', 30], ['larry', 40], ['curly', 50]] (order is not guaranteed) - */ - function pairs(object) { - var result = []; - forOwn(object, function(value, key) { - result.push([key, value]); - }); - return result; - } + /** + * This method is like `_.set` except that it accepts `customizer` which is + * invoked to produce the objects of `path`. If `customizer` returns `undefined` + * path creation is handled by the method instead. The `customizer` is invoked + * with three arguments: (nsValue, key, nsObject). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {*} value The value to set. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @example + * + * var object = {}; + * + * _.setWith(object, '[0][1]', 'a', Object); + * // => { '0': { '1': 'a' } } + */ + function setWith(object, path, value, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return object == null ? object : baseSet(object, path, value, customizer); + } - /** - * Creates a shallow clone of `object` composed of the specified properties. - * Property names may be specified as individual arguments or as arrays of - * property names. If `callback` is passed, it will be executed for each property - * in the `object`, picking the properties `callback` returns truthy for. The - * `callback` is bound to `thisArg` and invoked with three arguments; (value, key, object). - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The source object. - * @param {Function|String} callback|[prop1, prop2, ...] The properties to pick - * or the function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns an object composed of the picked properties. - * @example - * - * _.pick({ 'name': 'moe', 'age': 40, 'userid': 'moe1' }, 'name', 'age'); - * // => { 'name': 'moe', 'age': 40 } - * - * _.pick({ 'name': 'moe', '_hint': 'knucklehead', '_seed': '96c4eb' }, function(value, key) { - * return key.charAt(0) != '_'; - * }); - * // => { 'name': 'moe' } - */ - function pick(object, callback, thisArg) { - var result = {}; - if (typeof callback != 'function') { - var index = 0, - props = concat.apply(arrayRef, arguments), - length = props.length; + /** + * Creates an array of own enumerable string keyed-value pairs for `object` + * which can be consumed by `_.fromPairs`. If `object` is a map or set, its + * entries are returned. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias entries + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the key-value pairs. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.toPairs(new Foo); + * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed) + */ + var toPairs = createToPairs(keys); - while (++index < length) { - var key = props[index]; - if (key in object) { - result[key] = object[key]; + /** + * Creates an array of own and inherited enumerable string keyed-value pairs + * for `object` which can be consumed by `_.fromPairs`. If `object` is a map + * or set, its entries are returned. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias entriesIn + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the key-value pairs. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.toPairsIn(new Foo); + * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed) + */ + var toPairsIn = createToPairs(keysIn); + + /** + * An alternative to `_.reduce`; this method transforms `object` to a new + * `accumulator` object which is the result of running each of its own + * enumerable string keyed properties thru `iteratee`, with each invocation + * potentially mutating the `accumulator` object. If `accumulator` is not + * provided, a new object with the same `[[Prototype]]` will be used. The + * iteratee is invoked with four arguments: (accumulator, value, key, object). + * Iteratee functions may exit iteration early by explicitly returning `false`. + * + * @static + * @memberOf _ + * @since 1.3.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @param {*} [accumulator] The custom accumulator value. + * @returns {*} Returns the accumulated value. + * @example + * + * _.transform([2, 3, 4], function(result, n) { + * result.push(n *= n); + * return n % 2 == 0; + * }, []); + * // => [4, 9] + * + * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { + * (result[value] || (result[value] = [])).push(key); + * }, {}); + * // => { '1': ['a', 'c'], '2': ['b'] } + */ + function transform(object, iteratee, accumulator) { + var isArr = isArray(object), + isArrLike = isArr || isBuffer(object) || isTypedArray(object); + + iteratee = getIteratee(iteratee, 4); + if (accumulator == null) { + var Ctor = object && object.constructor; + if (isArrLike) { + accumulator = isArr ? new Ctor : []; } - } - } else { - callback = createCallback(callback, thisArg); - forIn(object, function(value, key, object) { - if (callback(value, key, object)) { - result[key] = value; + else if (isObject(object)) { + accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {}; } + else { + accumulator = {}; + } + } + (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) { + return iteratee(accumulator, value, index, object); }); + return accumulator; } - return result; - } - - /** - * Creates an array composed of the own enumerable property values of `object`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property values. - * @example - * - * _.values({ 'one': 1, 'two': 2, 'three': 3 }); - * // => [1, 2, 3] - */ - function values(object) { - var result = []; - forOwn(object, function(value) { - result.push(value); - }); - return result; - } - /*--------------------------------------------------------------------------*/ + /** + * Removes the property at `path` of `object`. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to unset. + * @returns {boolean} Returns `true` if the property is deleted, else `false`. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 7 } }] }; + * _.unset(object, 'a[0].b.c'); + * // => true + * + * console.log(object); + * // => { 'a': [{ 'b': {} }] }; + * + * _.unset(object, ['a', '0', 'b', 'c']); + * // => true + * + * console.log(object); + * // => { 'a': [{ 'b': {} }] }; + */ + function unset(object, path) { + return object == null ? true : baseUnset(object, path); + } - /** - * Checks if a given `target` element is present in a `collection` using strict - * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used - * as the offset from the end of the collection. - * - * @static - * @memberOf _ - * @alias include - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Mixed} target The value to check for. - * @param {Number} [fromIndex=0] The index to search from. - * @returns {Boolean} Returns `true` if the `target` element is found, else `false`. - * @example - * - * _.contains([1, 2, 3], 1); - * // => true - * - * _.contains([1, 2, 3], 1, 2); - * // => false - * - * _.contains({ 'name': 'moe', 'age': 40 }, 'moe'); - * // => true - * - * _.contains('curly', 'ur'); - * // => true - */ - function contains(collection, target, fromIndex) { - var index = -1, - length = collection ? collection.length : 0, - result = false; - - fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0; - if (typeof length == 'number') { - result = (isString(collection) - ? collection.indexOf(target, fromIndex) - : indexOf(collection, target, fromIndex) - ) > -1; - } else { - each(collection, function(value) { - if (++index >= fromIndex) { - return !(result = value === target); - } - }); + /** + * This method is like `_.set` except that accepts `updater` to produce the + * value to set. Use `_.updateWith` to customize `path` creation. The `updater` + * is invoked with one argument: (value). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.6.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {Function} updater The function to produce the updated value. + * @returns {Object} Returns `object`. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * + * _.update(object, 'a[0].b.c', function(n) { return n * n; }); + * console.log(object.a[0].b.c); + * // => 9 + * + * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; }); + * console.log(object.x[0].y.z); + * // => 0 + */ + function update(object, path, updater) { + return object == null ? object : baseUpdate(object, path, castFunction(updater)); } - return result; - } - /** - * Creates an object composed of keys returned from running each element of - * `collection` through a `callback`. The corresponding value of each key is - * the number of times the key was returned by `callback`. The `callback` is - * bound to `thisArg` and invoked with three arguments; (value, index|key, collection). - * The `callback` argument may also be the name of a property to count by (e.g. 'length'). - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|String} callback|property The function called per iteration - * or property name to count by. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); }); - * // => { '4': 1, '6': 2 } - * - * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math); - * // => { '4': 1, '6': 2 } - * - * _.countBy(['one', 'two', 'three'], 'length'); - * // => { '3': 2, '5': 1 } - */ - function countBy(collection, callback, thisArg) { - var result = {}; - callback = createCallback(callback, thisArg); + /** + * This method is like `_.update` except that it accepts `customizer` which is + * invoked to produce the objects of `path`. If `customizer` returns `undefined` + * path creation is handled by the method instead. The `customizer` is invoked + * with three arguments: (nsValue, key, nsObject). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.6.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {Function} updater The function to produce the updated value. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @example + * + * var object = {}; + * + * _.updateWith(object, '[0][1]', _.constant('a'), Object); + * // => { '0': { '1': 'a' } } + */ + function updateWith(object, path, updater, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer); + } - forEach(collection, function(value, key, collection) { - key = callback(value, key, collection); - (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1); - }); - return result; - } + /** + * Creates an array of the own enumerable string keyed property values of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property values. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.values(new Foo); + * // => [1, 2] (iteration order is not guaranteed) + * + * _.values('hi'); + * // => ['h', 'i'] + */ + function values(object) { + return object == null ? [] : baseValues(object, keys(object)); + } - /** - * Checks if the `callback` returns a truthy value for **all** elements of a - * `collection`. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index|key, collection). - * - * @static - * @memberOf _ - * @alias all - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Boolean} Returns `true` if all elements pass the callback check, - * else `false`. - * @example - * - * _.every([true, 1, null, 'yes'], Boolean); - * // => false - */ - function every(collection, callback, thisArg) { - var result = true; - callback = createCallback(callback, thisArg); + /** + * Creates an array of the own and inherited enumerable string keyed property + * values of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property values. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.valuesIn(new Foo); + * // => [1, 2, 3] (iteration order is not guaranteed) + */ + function valuesIn(object) { + return object == null ? [] : baseValues(object, keysIn(object)); + } - if (isArray(collection)) { - var index = -1, - length = collection.length; + /*------------------------------------------------------------------------*/ - while (++index < length) { - if (!(result = !!callback(collection[index], index, collection))) { - break; - } + /** + * Clamps `number` within the inclusive `lower` and `upper` bounds. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Number + * @param {number} number The number to clamp. + * @param {number} [lower] The lower bound. + * @param {number} upper The upper bound. + * @returns {number} Returns the clamped number. + * @example + * + * _.clamp(-10, -5, 5); + * // => -5 + * + * _.clamp(10, -5, 5); + * // => 5 + */ + function clamp(number, lower, upper) { + if (upper === undefined) { + upper = lower; + lower = undefined; } - } else { - each(collection, function(value, index, collection) { - return (result = !!callback(value, index, collection)); - }); + if (upper !== undefined) { + upper = toNumber(upper); + upper = upper === upper ? upper : 0; + } + if (lower !== undefined) { + lower = toNumber(lower); + lower = lower === lower ? lower : 0; + } + return baseClamp(toNumber(number), lower, upper); } - return result; - } - - /** - * Examines each element in a `collection`, returning an array of all elements - * the `callback` returns truthy for. The `callback` is bound to `thisArg` and - * invoked with three arguments; (value, index|key, collection). - * - * @static - * @memberOf _ - * @alias select - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of elements that passed the callback check. - * @example - * - * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); - * // => [2, 4, 6] - */ - function filter(collection, callback, thisArg) { - var result = []; - callback = createCallback(callback, thisArg); - if (isArray(collection)) { - var index = -1, - length = collection.length; + /** + * Checks if `n` is between `start` and up to, but not including, `end`. If + * `end` is not specified, it's set to `start` with `start` then set to `0`. + * If `start` is greater than `end` the params are swapped to support + * negative ranges. + * + * @static + * @memberOf _ + * @since 3.3.0 + * @category Number + * @param {number} number The number to check. + * @param {number} [start=0] The start of the range. + * @param {number} end The end of the range. + * @returns {boolean} Returns `true` if `number` is in the range, else `false`. + * @see _.range, _.rangeRight + * @example + * + * _.inRange(3, 2, 4); + * // => true + * + * _.inRange(4, 8); + * // => true + * + * _.inRange(4, 2); + * // => false + * + * _.inRange(2, 2); + * // => false + * + * _.inRange(1.2, 2); + * // => true + * + * _.inRange(5.2, 4); + * // => false + * + * _.inRange(-3, -2, -6); + * // => true + */ + function inRange(number, start, end) { + start = toFinite(start); + if (end === undefined) { + end = start; + start = 0; + } else { + end = toFinite(end); + } + number = toNumber(number); + return baseInRange(number, start, end); + } - while (++index < length) { - var value = collection[index]; - if (callback(value, index, collection)) { - result.push(value); + /** + * Produces a random number between the inclusive `lower` and `upper` bounds. + * If only one argument is provided a number between `0` and the given number + * is returned. If `floating` is `true`, or either `lower` or `upper` are + * floats, a floating-point number is returned instead of an integer. + * + * **Note:** JavaScript follows the IEEE-754 standard for resolving + * floating-point values which can produce unexpected results. + * + * @static + * @memberOf _ + * @since 0.7.0 + * @category Number + * @param {number} [lower=0] The lower bound. + * @param {number} [upper=1] The upper bound. + * @param {boolean} [floating] Specify returning a floating-point number. + * @returns {number} Returns the random number. + * @example + * + * _.random(0, 5); + * // => an integer between 0 and 5 + * + * _.random(5); + * // => also an integer between 0 and 5 + * + * _.random(5, true); + * // => a floating-point number between 0 and 5 + * + * _.random(1.2, 5.2); + * // => a floating-point number between 1.2 and 5.2 + */ + function random(lower, upper, floating) { + if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) { + upper = floating = undefined; + } + if (floating === undefined) { + if (typeof upper == 'boolean') { + floating = upper; + upper = undefined; + } + else if (typeof lower == 'boolean') { + floating = lower; + lower = undefined; } } - } else { - each(collection, function(value, index, collection) { - if (callback(value, index, collection)) { - result.push(value); + if (lower === undefined && upper === undefined) { + lower = 0; + upper = 1; + } + else { + lower = toFinite(lower); + if (upper === undefined) { + upper = lower; + lower = 0; + } else { + upper = toFinite(upper); } - }); + } + if (lower > upper) { + var temp = lower; + lower = upper; + upper = temp; + } + if (floating || lower % 1 || upper % 1) { + var rand = nativeRandom(); + return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper); + } + return baseRandom(lower, upper); } - return result; - } - /** - * Examines each element in a `collection`, returning the first one the `callback` - * returns truthy for. The function returns as soon as it finds an acceptable - * element, and does not iterate over the entire `collection`. The `callback` is - * bound to `thisArg` and invoked with three arguments; (value, index|key, collection). - * - * @static - * @memberOf _ - * @alias detect - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the element that passed the callback check, - * else `undefined`. - * @example - * - * var even = _.find([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); - * // => 2 - */ - function find(collection, callback, thisArg) { - var result; - callback = createCallback(callback, thisArg); + /*------------------------------------------------------------------------*/ - forEach(collection, function(value, index, collection) { - if (callback(value, index, collection)) { - result = value; - return false; - } + /** + * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the camel cased string. + * @example + * + * _.camelCase('Foo Bar'); + * // => 'fooBar' + * + * _.camelCase('--foo-bar--'); + * // => 'fooBar' + * + * _.camelCase('__FOO_BAR__'); + * // => 'fooBar' + */ + var camelCase = createCompounder(function(result, word, index) { + word = word.toLowerCase(); + return result + (index ? capitalize(word) : word); }); - return result; - } - - /** - * Iterates over a `collection`, executing the `callback` for each element in - * the `collection`. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index|key, collection). Callbacks may exit iteration early - * by explicitly returning `false`. - * - * @static - * @memberOf _ - * @alias each - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array|Object|String} Returns `collection`. - * @example - * - * _([1, 2, 3]).forEach(alert).join(','); - * // => alerts each number and returns '1,2,3' - * - * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert); - * // => alerts each number value (order is not guaranteed) - */ - function forEach(collection, callback, thisArg) { - if (callback && typeof thisArg == 'undefined' && isArray(collection)) { - var index = -1, - length = collection.length; - while (++index < length) { - if (callback(collection[index], index, collection) === false) { - break; - } - } - } else { - each(collection, callback, thisArg); + /** + * Converts the first character of `string` to upper case and the remaining + * to lower case. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to capitalize. + * @returns {string} Returns the capitalized string. + * @example + * + * _.capitalize('FRED'); + * // => 'Fred' + */ + function capitalize(string) { + return upperFirst(toString(string).toLowerCase()); } - return collection; - } - /** - * Creates an object composed of keys returned from running each element of - * `collection` through a `callback`. The corresponding value of each key is an - * array of elements passed to `callback` that returned the key. The `callback` - * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection). - * The `callback` argument may also be the name of a property to group by (e.g. 'length'). - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|String} callback|property The function called per iteration - * or property name to group by. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); }); - * // => { '4': [4.2], '6': [6.1, 6.4] } - * - * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math); - * // => { '4': [4.2], '6': [6.1, 6.4] } - * - * _.groupBy(['one', 'two', 'three'], 'length'); - * // => { '3': ['one', 'two'], '5': ['three'] } - */ - function groupBy(collection, callback, thisArg) { - var result = {}; - callback = createCallback(callback, thisArg); + /** + * Deburrs `string` by converting + * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table) + * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A) + * letters to basic Latin letters and removing + * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to deburr. + * @returns {string} Returns the deburred string. + * @example + * + * _.deburr('déjà vu'); + * // => 'deja vu' + */ + function deburr(string) { + string = toString(string); + return string && string.replace(reLatin, deburrLetter).replace(reComboMark, ''); + } - forEach(collection, function(value, key, collection) { - key = callback(value, key, collection); - (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value); - }); - return result; - } + /** + * Checks if `string` ends with the given target string. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to inspect. + * @param {string} [target] The string to search for. + * @param {number} [position=string.length] The position to search up to. + * @returns {boolean} Returns `true` if `string` ends with `target`, + * else `false`. + * @example + * + * _.endsWith('abc', 'c'); + * // => true + * + * _.endsWith('abc', 'b'); + * // => false + * + * _.endsWith('abc', 'b', 2); + * // => true + */ + function endsWith(string, target, position) { + string = toString(string); + target = baseToString(target); - /** - * Invokes the method named by `methodName` on each element in the `collection`, - * returning an array of the results of each invoked method. Additional arguments - * will be passed to each invoked method. If `methodName` is a function it will - * be invoked for, and `this` bound to, each element in the `collection`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|String} methodName The name of the method to invoke or - * the function invoked per iteration. - * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with. - * @returns {Array} Returns a new array of the results of each invoked method. - * @example - * - * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort'); - * // => [[1, 5, 7], [1, 2, 3]] - * - * _.invoke([123, 456], String.prototype.split, ''); - * // => [['1', '2', '3'], ['4', '5', '6']] - */ - function invoke(collection, methodName) { - var args = slice(arguments, 2), - isFunc = typeof methodName == 'function', - result = []; + var length = string.length; + position = position === undefined + ? length + : baseClamp(toInteger(position), 0, length); + + var end = position; + position -= target.length; + return position >= 0 && string.slice(position, end) == target; + } + + /** + * Converts the characters "&", "<", ">", '"', and "'" in `string` to their + * corresponding HTML entities. + * + * **Note:** No other characters are escaped. To escape additional + * characters use a third-party library like [_he_](https://mths.be/he). + * + * Though the ">" character is escaped for symmetry, characters like + * ">" and "/" don't need escaping in HTML and have no special meaning + * unless they're part of a tag or unquoted attribute value. See + * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands) + * (under "semi-related fun fact") for more details. + * + * When working with HTML you should always + * [quote attribute values](http://wonko.com/post/html-escaping) to reduce + * XSS vectors. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category String + * @param {string} [string=''] The string to escape. + * @returns {string} Returns the escaped string. + * @example + * + * _.escape('fred, barney, & pebbles'); + * // => 'fred, barney, & pebbles' + */ + function escape(string) { + string = toString(string); + return (string && reHasUnescapedHtml.test(string)) + ? string.replace(reUnescapedHtml, escapeHtmlChar) + : string; + } + + /** + * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+", + * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to escape. + * @returns {string} Returns the escaped string. + * @example + * + * _.escapeRegExp('[lodash](https://lodash.com/)'); + * // => '\[lodash\]\(https://lodash\.com/\)' + */ + function escapeRegExp(string) { + string = toString(string); + return (string && reHasRegExpChar.test(string)) + ? string.replace(reRegExpChar, '\\$&') + : string; + } - forEach(collection, function(value) { - result.push((isFunc ? methodName : value[methodName]).apply(value, args)); + /** + * Converts `string` to + * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the kebab cased string. + * @example + * + * _.kebabCase('Foo Bar'); + * // => 'foo-bar' + * + * _.kebabCase('fooBar'); + * // => 'foo-bar' + * + * _.kebabCase('__FOO_BAR__'); + * // => 'foo-bar' + */ + var kebabCase = createCompounder(function(result, word, index) { + return result + (index ? '-' : '') + word.toLowerCase(); }); - return result; - } - /** - * Creates an array of values by running each element in the `collection` - * through a `callback`. The `callback` is bound to `thisArg` and invoked with - * three arguments; (value, index|key, collection). - * - * @static - * @memberOf _ - * @alias collect - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of the results of each `callback` execution. - * @example - * - * _.map([1, 2, 3], function(num) { return num * 3; }); - * // => [3, 6, 9] - * - * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; }); - * // => [3, 6, 9] (order is not guaranteed) - */ - function map(collection, callback, thisArg) { - var index = -1, - length = collection ? collection.length : 0, - result = Array(typeof length == 'number' ? length : 0); + /** + * Converts `string`, as space separated words, to lower case. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the lower cased string. + * @example + * + * _.lowerCase('--Foo-Bar--'); + * // => 'foo bar' + * + * _.lowerCase('fooBar'); + * // => 'foo bar' + * + * _.lowerCase('__FOO_BAR__'); + * // => 'foo bar' + */ + var lowerCase = createCompounder(function(result, word, index) { + return result + (index ? ' ' : '') + word.toLowerCase(); + }); - callback = createCallback(callback, thisArg); - if (isArray(collection)) { - while (++index < length) { - result[index] = callback(collection[index], index, collection); + /** + * Converts the first character of `string` to lower case. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the converted string. + * @example + * + * _.lowerFirst('Fred'); + * // => 'fred' + * + * _.lowerFirst('FRED'); + * // => 'fRED' + */ + var lowerFirst = createCaseFirst('toLowerCase'); + + /** + * Pads `string` on the left and right sides if it's shorter than `length`. + * Padding characters are truncated if they can't be evenly divided by `length`. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to pad. + * @param {number} [length=0] The padding length. + * @param {string} [chars=' '] The string used as padding. + * @returns {string} Returns the padded string. + * @example + * + * _.pad('abc', 8); + * // => ' abc ' + * + * _.pad('abc', 8, '_-'); + * // => '_-abc_-_' + * + * _.pad('abc', 3); + * // => 'abc' + */ + function pad(string, length, chars) { + string = toString(string); + length = toInteger(length); + + var strLength = length ? stringSize(string) : 0; + if (!length || strLength >= length) { + return string; } - } else { - each(collection, function(value, key, collection) { - result[++index] = callback(value, key, collection); - }); + var mid = (length - strLength) / 2; + return ( + createPadding(nativeFloor(mid), chars) + + string + + createPadding(nativeCeil(mid), chars) + ); } - return result; - } - /** - * Retrieves the maximum value of an `array`. If `callback` is passed, - * it will be executed for each value in the `array` to generate the - * criterion by which the value is ranked. The `callback` is bound to - * `thisArg` and invoked with three arguments; (value, index, collection). - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the maximum value. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 }, - * { 'name': 'curly', 'age': 60 } - * ]; - * - * _.max(stooges, function(stooge) { return stooge.age; }); - * // => { 'name': 'curly', 'age': 60 }; - */ - function max(collection, callback, thisArg) { - var computed = -Infinity, - index = -1, - length = collection ? collection.length : 0, - result = computed; - - if (callback || !isArray(collection)) { - callback = !callback && isString(collection) - ? charAtCallback - : createCallback(callback, thisArg); - - each(collection, function(value, index, collection) { - var current = callback(value, index, collection); - if (current > computed) { - computed = current; - result = value; - } - }); - } else { - while (++index < length) { - if (collection[index] > result) { - result = collection[index]; - } + /** + * Pads `string` on the right side if it's shorter than `length`. Padding + * characters are truncated if they exceed `length`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to pad. + * @param {number} [length=0] The padding length. + * @param {string} [chars=' '] The string used as padding. + * @returns {string} Returns the padded string. + * @example + * + * _.padEnd('abc', 6); + * // => 'abc ' + * + * _.padEnd('abc', 6, '_-'); + * // => 'abc_-_' + * + * _.padEnd('abc', 3); + * // => 'abc' + */ + function padEnd(string, length, chars) { + string = toString(string); + length = toInteger(length); + + var strLength = length ? stringSize(string) : 0; + return (length && strLength < length) + ? (string + createPadding(length - strLength, chars)) + : string; + } + + /** + * Pads `string` on the left side if it's shorter than `length`. Padding + * characters are truncated if they exceed `length`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to pad. + * @param {number} [length=0] The padding length. + * @param {string} [chars=' '] The string used as padding. + * @returns {string} Returns the padded string. + * @example + * + * _.padStart('abc', 6); + * // => ' abc' + * + * _.padStart('abc', 6, '_-'); + * // => '_-_abc' + * + * _.padStart('abc', 3); + * // => 'abc' + */ + function padStart(string, length, chars) { + string = toString(string); + length = toInteger(length); + + var strLength = length ? stringSize(string) : 0; + return (length && strLength < length) + ? (createPadding(length - strLength, chars) + string) + : string; + } + + /** + * Converts `string` to an integer of the specified radix. If `radix` is + * `undefined` or `0`, a `radix` of `10` is used unless `value` is a + * hexadecimal, in which case a `radix` of `16` is used. + * + * **Note:** This method aligns with the + * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`. + * + * @static + * @memberOf _ + * @since 1.1.0 + * @category String + * @param {string} string The string to convert. + * @param {number} [radix=10] The radix to interpret `value` by. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {number} Returns the converted integer. + * @example + * + * _.parseInt('08'); + * // => 8 + * + * _.map(['6', '08', '10'], _.parseInt); + * // => [6, 8, 10] + */ + function parseInt(string, radix, guard) { + if (guard || radix == null) { + radix = 0; + } else if (radix) { + radix = +radix; } + return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0); } - return result; - } - /** - * Retrieves the minimum value of an `array`. If `callback` is passed, - * it will be executed for each value in the `array` to generate the - * criterion by which the value is ranked. The `callback` is bound to `thisArg` - * and invoked with three arguments; (value, index, collection). - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the minimum value. - * @example - * - * _.min([10, 5, 100, 2, 1000]); - * // => 2 - */ - function min(collection, callback, thisArg) { - var computed = Infinity, - index = -1, - length = collection ? collection.length : 0, - result = computed; - - if (callback || !isArray(collection)) { - callback = !callback && isString(collection) - ? charAtCallback - : createCallback(callback, thisArg); - - each(collection, function(value, index, collection) { - var current = callback(value, index, collection); - if (current < computed) { - computed = current; - result = value; - } - }); - } else { - while (++index < length) { - if (collection[index] < result) { - result = collection[index]; - } + /** + * Repeats the given string `n` times. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to repeat. + * @param {number} [n=1] The number of times to repeat the string. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {string} Returns the repeated string. + * @example + * + * _.repeat('*', 3); + * // => '***' + * + * _.repeat('abc', 2); + * // => 'abcabc' + * + * _.repeat('abc', 0); + * // => '' + */ + function repeat(string, n, guard) { + if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) { + n = 1; + } else { + n = toInteger(n); } + return baseRepeat(toString(string), n); } - return result; - } - /** - * Retrieves the value of a specified property from all elements in - * the `collection`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {String} property The property to pluck. - * @returns {Array} Returns a new array of property values. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 }, - * { 'name': 'curly', 'age': 60 } - * ]; - * - * _.pluck(stooges, 'name'); - * // => ['moe', 'larry', 'curly'] - */ - function pluck(collection, property) { - return map(collection, property + ''); - } + /** + * Replaces matches for `pattern` in `string` with `replacement`. + * + * **Note:** This method is based on + * [`String#replace`](https://mdn.io/String/replace). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to modify. + * @param {RegExp|string} pattern The pattern to replace. + * @param {Function|string} replacement The match replacement. + * @returns {string} Returns the modified string. + * @example + * + * _.replace('Hi Fred', 'Fred', 'Barney'); + * // => 'Hi Barney' + */ + function replace() { + var args = arguments, + string = toString(args[0]); - /** - * Boils down a `collection` to a single value. The initial state of the - * reduction is `accumulator` and each successive step of it should be returned - * by the `callback`. The `callback` is bound to `thisArg` and invoked with 4 - * arguments; for arrays they are (accumulator, value, index|key, collection). - * - * @static - * @memberOf _ - * @alias foldl, inject - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [accumulator] Initial value of the accumulator. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the accumulated value. - * @example - * - * var sum = _.reduce([1, 2, 3], function(memo, num) { return memo + num; }); - * // => 6 - */ - function reduce(collection, callback, accumulator, thisArg) { - var noaccum = arguments.length < 3; - callback = createCallback(callback, thisArg, indicatorObject); + return args.length < 3 ? string : string.replace(args[1], args[2]); + } - if (isArray(collection)) { - var index = -1, - length = collection.length; + /** + * Converts `string` to + * [snake case](https://en.wikipedia.org/wiki/Snake_case). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the snake cased string. + * @example + * + * _.snakeCase('Foo Bar'); + * // => 'foo_bar' + * + * _.snakeCase('fooBar'); + * // => 'foo_bar' + * + * _.snakeCase('--FOO-BAR--'); + * // => 'foo_bar' + */ + var snakeCase = createCompounder(function(result, word, index) { + return result + (index ? '_' : '') + word.toLowerCase(); + }); - if (noaccum) { - accumulator = collection[++index]; + /** + * Splits `string` by `separator`. + * + * **Note:** This method is based on + * [`String#split`](https://mdn.io/String/split). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to split. + * @param {RegExp|string} separator The separator pattern to split by. + * @param {number} [limit] The length to truncate results to. + * @returns {Array} Returns the string segments. + * @example + * + * _.split('a-b-c', '-', 2); + * // => ['a', 'b'] + */ + function split(string, separator, limit) { + if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) { + separator = limit = undefined; } - while (++index < length) { - accumulator = callback(accumulator, collection[index], index, collection); + limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0; + if (!limit) { + return []; } - } else { - each(collection, function(value, index, collection) { - accumulator = noaccum - ? (noaccum = false, value) - : callback(accumulator, value, index, collection) - }); + string = toString(string); + if (string && ( + typeof separator == 'string' || + (separator != null && !isRegExp(separator)) + )) { + separator = baseToString(separator); + if (!separator && hasUnicode(string)) { + return castSlice(stringToArray(string), 0, limit); + } + } + return string.split(separator, limit); } - return accumulator; - } - /** - * The right-associative version of `_.reduce`. - * - * @static - * @memberOf _ - * @alias foldr - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [accumulator] Initial value of the accumulator. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the accumulated value. - * @example - * - * var list = [[0, 1], [2, 3], [4, 5]]; - * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []); - * // => [4, 5, 2, 3, 0, 1] - */ - function reduceRight(collection, callback, accumulator, thisArg) { - var iteratee = collection, - length = collection ? collection.length : 0, - noaccum = arguments.length < 3; - - if (typeof length != 'number') { - var props = keys(collection); - length = props.length; - } else if (noCharByIndex && isString(collection)) { - iteratee = collection.split(''); - } - callback = createCallback(callback, thisArg, indicatorObject); - forEach(collection, function(value, index, collection) { - index = props ? props[--length] : --length; - accumulator = noaccum - ? (noaccum = false, iteratee[index]) - : callback(accumulator, iteratee[index], index, collection); + /** + * Converts `string` to + * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage). + * + * @static + * @memberOf _ + * @since 3.1.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the start cased string. + * @example + * + * _.startCase('--foo-bar--'); + * // => 'Foo Bar' + * + * _.startCase('fooBar'); + * // => 'Foo Bar' + * + * _.startCase('__FOO_BAR__'); + * // => 'FOO BAR' + */ + var startCase = createCompounder(function(result, word, index) { + return result + (index ? ' ' : '') + upperFirst(word); }); - return accumulator; - } - /** - * The opposite of `_.filter`, this method returns the values of a - * `collection` that `callback` does **not** return truthy for. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of elements that did **not** pass the - * callback check. - * @example - * - * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); - * // => [1, 3, 5] - */ - function reject(collection, callback, thisArg) { - callback = createCallback(callback, thisArg); - return filter(collection, function(value, index, collection) { - return !callback(value, index, collection); - }); - } + /** + * Checks if `string` starts with the given target string. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to inspect. + * @param {string} [target] The string to search for. + * @param {number} [position=0] The position to search from. + * @returns {boolean} Returns `true` if `string` starts with `target`, + * else `false`. + * @example + * + * _.startsWith('abc', 'a'); + * // => true + * + * _.startsWith('abc', 'b'); + * // => false + * + * _.startsWith('abc', 'b', 1); + * // => true + */ + function startsWith(string, target, position) { + string = toString(string); + position = position == null + ? 0 + : baseClamp(toInteger(position), 0, string.length); - /** - * Creates an array of shuffled `array` values, using a version of the - * Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to shuffle. - * @returns {Array} Returns a new shuffled collection. - * @example - * - * _.shuffle([1, 2, 3, 4, 5, 6]); - * // => [4, 1, 6, 3, 5, 2] - */ - function shuffle(collection) { - var index = -1, - result = Array(collection ? collection.length : 0); + target = baseToString(target); + return string.slice(position, position + target.length) == target; + } - forEach(collection, function(value) { - var rand = floor(nativeRandom() * (++index + 1)); - result[index] = result[rand]; - result[rand] = value; - }); - return result; - } - - /** - * Gets the size of the `collection` by returning `collection.length` for arrays - * and array-like objects or the number of own enumerable properties for objects. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to inspect. - * @returns {Number} Returns `collection.length` or number of own enumerable properties. - * @example - * - * _.size([1, 2]); - * // => 2 - * - * _.size({ 'one': 1, 'two': 2, 'three': 3 }); - * // => 3 - * - * _.size('curly'); - * // => 5 - */ - function size(collection) { - var length = collection ? collection.length : 0; - return typeof length == 'number' ? length : keys(collection).length; - } + /** + * Creates a compiled template function that can interpolate data properties + * in "interpolate" delimiters, HTML-escape interpolated data properties in + * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data + * properties may be accessed as free variables in the template. If a setting + * object is given, it takes precedence over `_.templateSettings` values. + * + * **Note:** In the development build `_.template` utilizes + * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) + * for easier debugging. + * + * For more information on precompiling templates see + * [lodash's custom builds documentation](https://lodash.com/custom-builds). + * + * For more information on Chrome extension sandboxes see + * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval). + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category String + * @param {string} [string=''] The template string. + * @param {Object} [options={}] The options object. + * @param {RegExp} [options.escape=_.templateSettings.escape] + * The HTML "escape" delimiter. + * @param {RegExp} [options.evaluate=_.templateSettings.evaluate] + * The "evaluate" delimiter. + * @param {Object} [options.imports=_.templateSettings.imports] + * An object to import into the template as free variables. + * @param {RegExp} [options.interpolate=_.templateSettings.interpolate] + * The "interpolate" delimiter. + * @param {string} [options.sourceURL='lodash.templateSources[n]'] + * The sourceURL of the compiled template. + * @param {string} [options.variable='obj'] + * The data object variable name. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Function} Returns the compiled template function. + * @example + * + * // Use the "interpolate" delimiter to create a compiled template. + * var compiled = _.template('hello <%= user %>!'); + * compiled({ 'user': 'fred' }); + * // => 'hello fred!' + * + * // Use the HTML "escape" delimiter to escape data property values. + * var compiled = _.template('<%- value %>'); + * compiled({ 'value': '