Mediator

mediator.js

 var subscriptions = {};

var Mediator = function() {};

Mediator.prototype.subscribe = function(key, callback, context) {
  subscriptions[key] = subscriptions[key] || [];

  subscriptions[key].push({
    callback: callback,
    context: context || window
  });
};

Mediator.prototype.publish = function(key, params, context) {
  if(!subscriptions[key]) return;

  var length = subscriptions[key].length;

  for(var i = 0; i < length; i += 1) {
    subscriptions[key][i].callback.call(subscriptions[key][i].context, params);
  }
};

NS.mediator = new Mediator();