gistfile1.coffee

class Set
  constructor: ->
    @items = {}
    @count = 0
  
  guid = 0
  stringCache = {}
  hash = (object) ->
    switch typeof object
      when 'number', 'boolean'
        return '' + object

      when 'string'
        return stringCache[object] ?= '' + (guid++)

      when 'object'
        return object['__setGuid'] ?= '' + (guid++)

  contains: (item) ->
    return @items[hash(item)] is item

  add: (item) ->
    return if @contains item

    @items[hash(item)] = item
    @count++

  remove: (item) ->
    return unless @contains item

    delete @items[hash(item)]
    @count--