function Factory() { this.notificationCenter = new NotificationCenter(); } Factory.prototype.new = function (constructor /*, arg1, arg2, ... */) { if (arguments.length < 1) throw 'Too fiew arguments'; if (typeof arguments[0] != 'function') throw arguments[0] + ' is not a function'; var instance = Object.create(constructor.prototype, { notificationCenter: { value: this.notificationCenter }, factory: { value: this } }); constructor.apply(instance, Array.prototype.slice.call(arguments, [1])); return instance; } function Player(name) { this.name = name; this.notificationCenter.log("Player " + name + " created") } function NotificationCenter() { this.foo = "a" } NotificationCenter.prototype.log = function(a) { console.log(a) } var factory = new Factory(); var player = factory.new(Player, "jeena"); player.factory.new(Player, "logsol").notificationCenter.log("test"); /* Lala:chuck.js jeena$ node Factory.js foo */