JavaScript: jQuery Pubsub

gistfile1.js

(function($){
  var o = $( {} );

  $.each({
    on: 'subscribe',
    trigger: 'publish',
    off: 'unsubscribe'
  }, function(key, api) {
      $[api] = fiunction(){
          o[key].apply(o, arguments);
      }
  });
})(jQuery);