Facebook Javascript SDK loader with jQuery

jquery.facebook.coffee

$.facebook = (id, {locale}={}, callback=->) ->                                  
  locale ?= 'en_US'                                                             
                                                                                
  window.fbAsyncInit = ->                                                       
    FB.init appId: id, status: true, cookie: true, xfbml: true                  
    FB.Canvas.setAutoGrow()
    FB.getLoginStatus callback                                                  

  $('body').append $('<div>').attr('id', 'fb-root')                             
  $('<script>').each ->                                                         
    @id = 'facebook-jssdk'                                                      
    @async = true                                                               
    @src = "//connect.facebook.net/#{locale}/all.js"                            
    $('head').append @
    

jquery.facebook.js

// Generated by CoffeeScript 1.3.3
(function() {

  $.facebook = function(id, _arg, callback) {
    var locale;
    locale = (_arg != null ? _arg : {}).locale;
    if (callback == null) {
      callback = function() {};
    }
    if (locale == null) {
      locale = 'en_US';
    }
    window.fbAsyncInit = function() {
      FB.init({
        appId: id,
        status: true,
        cookie: true,
        xfbml: true
      });
      FB.Canvas.setAutoGrow();
      return FB.getLoginStatus(callback);
    };
    $('body').append($('<div>').attr('id', 'fb-root'));
    return $('<script>').each(function() {
      this.id = 'facebook-jssdk';
      this.async = true;
      this.src = "//connect.facebook.net/" + locale + "/all.js";
      return $('head').append(this);
    });
  };

}).call(this);