Queue implementation in CoffeeScript

q.coffee

class Q
  constructor: (@bound) ->
    @offset = 0
    @length = 0
    @data = []
  enqueue: (value) ->
    return undefined if @length == @bound
    @data.push value
    ++@length
  dequeue: ->
    return undefined if !@length
    value = @data[@offset]
    @offset++
    @length--
    return value