pubsub.js

/**
 * @method: PubSub
 * */
;(function(global) {
  'use strict';

  function PubSub () {
    this.topics = {};
  };

  PubSub.prototype.subscribe = function(name, fn) {
    this.topics[name] = this.topics[name] || [];
    this.topics[name].push(fn);
  }

  PubSub.prototype.publish = function(name, args) {
    this.topics[name] = this.topics[name] || [];
    this.topics[name].forEach(function(fn) {
      fn.apply(this, args);
    });
  }

  global.PubSub = new PubSub();

}) (window);

PubSub.subscribe('foo', function (a, b) {
  console.log('hey there from foo callback', arguments, a, b)
});

PubSub.subscribe('foo', function (a, b) {
  console.log('hey there again from another foo callback', arguments, a, b)
});

PubSub.publish('foo', ['myArgument', 'anotherArg']);