Like David Walsh's pubsub object but better

pubsub.js

/* Improved from http://davidwalsh.name/pubsub-javascript
- Improved readability
- Friendlier naming conventions
- Generic data for publishing
*/

var event: (function(){
  var topic = {};
  return {
    subscribe: function(name, listener) {
      if ( _.isUndefined(topic[name]) ) {
        topic[name] = { queue: [] };
      }
      var index = topic[name].queue.push(listener) - 1;

      return {
        remove: function() {
          delete topic[name].queue[index];
        }
      };
    },
     
    publish: function(name, data) {
      if(_.isUndefined(topic[name]) || topic[name].queue.length == 0) {
        return;
      } 

      topic[name].queue.forEach(function(callback) {
        callback(data || null);
      });
    }
  };
})()

// Example usage
var subscription = event.subscrube('test', function(string) { alert(string); });
event.publish('test', 'hi!');
event.publish('test');
subscription.remove();

depends on underscore || lodash ?

Do you use this @JScott ?