Mediator Pattern

example.js

// Example 1
mediator.name = 'Doug';
mediator.subscribe('nameChange', function(arg) {
  console.log(this.name);
  this.name = arg;
  console.log(this.name);
});

mediator.publish('nameChange', 'Jorn');


// Example 2
var obj = {
  name: 'John'
};
mediator.installTo(obj);

obj.subscribe('nameChange', function(arg) {
  console.log(this.name);
  this.name = arg;
  console.log(this.name);
});

obj.publish('nameChange', 'Sam');

mediator.js

var mediator = (function() {
  var subscribe = function(channel, fn) {
    if (!mediator.channels[channel]) mediator.channels[channel] = [];
    mediator.channels[channel].push({
      context: this,
      callback: fn
    });
    return this;
  };
  var publish = function(channel) {
    if (!mediator.channels[channel]) return false;
    var args = Array.prototype.slice.call(arguments, 1);
    for (var i = 0, l = mediator.channels[channel].length; i < l; i++) {
      var subscription = mediator.channels[channel][i];
      subscription.callback.apply(subscription.context.args);
    };
    return this;
  };
  return {
    channels: {},
    publish: publish,
    subscribe: subscribe,
    installTo: function(obj) {
      obj.subscribe = subscribe;
      obj.publish = publish;
    }
  };
}());

// REFERENCE:
// https://gist.github.com/addyosmani/1794823