Boilerplate for jQuery plugin in CoffeeScript

jquery.example.coffee

class Widget
  constructor: (@widget)->
    @input.data("example-widget", @)
    return

(($)->

  $.fn.exampleWidget = (action, arg)->
    @.each(->
      $this = $(@)
      widget = $this.data("example-widget")
      if not widget
        widget = new Widget($this)
      if action
        widget[action](arg)
    )
)(jQuery)