Debouncing function for jQuery .resize() in Coffeescript

smart-resize.coffee

## http://www.paulirish.com/2009/throttled-smartresize-jquery-event-handler/
## ---------------------------------------------
## debouncing function from John Hann
## http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/
#
# (function($,sr){
#   var debounce = function (func, threshold, execAsap) {
#       var timeout;
#       return function debounced () {
#           var obj = this, args = arguments;
#           function delayed () {
#               if (!execAsap)
#                   func.apply(obj, args);
#               timeout = null;
#           }
#           if (timeout)
#               clearTimeout(timeout);
#           else if (execAsap)
#               func.apply(obj, args);
#           timeout = setTimeout(delayed, threshold || 100);
#       }
#   }
#   // Smartresize
#   jQuery.fn[sr] = function(fn){  return fn ? this.bind('resize', debounce(fn)) : this.trigger(sr); };
#
# })(jQuery,'smartresize');

(($, sr) ->
  debounce = (func, threshold, execAsap) ->
    timeout = undefined
    debounced = ->
      delayed = ->
        func.apply obj, args  unless execAsap
        timeout = null
        return
      obj = this
      args = arguments
      if timeout
        clearTimeout timeout
      else func.apply obj, args  if execAsap
      timeout = setTimeout(delayed, threshold or 100)
      return


  # Smartresize
  jQuery.fn[sr] = (fn) ->
    (if fn then @bind("resize", debounce(fn)) else @trigger(sr))

  return
) jQuery, "smartresize"