gistfile1.js

var createEvent = function() { 
  var _handlers = [];
  
  return function() {
    if (arguments.length === 1 && typeof arguments[0] === 'function') {
      _handlers.push(arguments[0]);
      return;
    }
    
    for (var i = 0; i < _handlers.length; ++i) {
      _handlers[i].apply(this, arguments);
    }
  }; 
};