Placeholder jQuery Plugin in CoffeeScript

placeholder.coffee

# Ported from Josh Bush's example at http://digitalbush.com/2011/03/29/testing-jquery-plugins-with-node-js-and-jasmine/
$ = jQuery
$.fn.placeholder = (description) ->
  @.each ->
    input = $(@)
    # Note: We should use "on" instead of "bind" with the latest version of jQuery, but 
    # we'll leave this just like the original for now.
    input.bind("blur.placeholder", -> input.val(input.val() or description))
      .bind("focus.placeholder", -> if input.val() is description then input.val(''))
      .trigger "blur.placeholder"