on & trigger methods for classes

EventEmitter.coffee

class EventEmitter
  constructor: ->
    @events = {}
  trigger: (keys, args...) ->
    for key in keys.split(' ')
      if @events[key]? 
        func.apply @, args for func in @events[key]
    @
 
  on: (keys, func) ->
    for key in keys.split(' ')
      @events[key] = [] if not @events[key]
      @events[key].push func
    @

# Example class
class User extends EventEmitter
  constructor: ->
    super
    @id = Date.now()