Dead Simple Event Aggregator

EventManager.js

module.exports = (function() {
  function EventManager() {
    this.events = {};
  }

  // Will throw if there is no existing event to trigger
  EventManager.prototype.trigger = function(msg) {
    // grab all arguments passed after the first argument
    var args = Array.prototype.splice.call(arguments, 1);
    for (var i = 0, len = this.events[msg].length; i < len; i++) {
      this.events[msg][i].apply(this, args);
    }
  };

  EventManager.prototype.on = function(msg, func) {
    if (!this.events[msg]) {
      this.events[msg] = [];
    }
    this.events[msg].push(func);
  };

  EventManager.prototype.off = function(msg, func) {
    for (var i = 0, len = this.events[msg].length; i < len; i++) {
      if (this.events[msg][i] === func) {
        this.events[msg].splice(i, 1);
      }
    }
  };

  return EventManager;
})();