JS Mediator Pattern Implementation

mediator.js

var mediator = (function() {
  'use strict';

  var
    subscribe = function(channel, fn) {
      if (!mediator.channels[channel]) {
        mediator.channels[channel] = [];
      }

      mediator.channels[channel].push({ context: this, callback: fn });
      return this;
    },

    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 {
    channels: {},
    publish: publish,
    subscribe: subscribe,
    installTo: function(obj) {
      obj.subscribe = subscribe;
      obj.publish = publish;
    }
  };
}());