vendor/gems/rspec-1.1.2/examples/pure/stack.rb

   1 class StackUnderflowError < RuntimeError
   2 end
   3
   4 class StackOverflowError < RuntimeError
   5 end
   6
   7 class Stack
   8
   9   def initialize
  10     @items = []
  11   end
  12
  13   def push object
  14     raise StackOverflowError if @items.length == 10
  15     @items.push object
  16   end
  17
  18   def pop
  19     raise StackUnderflowError if @items.empty?
  20     @items.delete @items.last
  21   end
  22
  23   def peek
  24     raise StackUnderflowError if @items.empty?
  25     @items.last
  26   end
  27
  28   def empty?
  29     @items.empty?
  30   end
  31
  32   def full?
  33     @items.length == 10
  34   end
  35
  36 end