var car = {
  start: function (afterStartCallback) {
    // Dispatch `start` event.
    this.dispatchEvent({type: 'start', message: 'Start engines'});
    afterStartCallback && afterStartCallback(this);
  },
  stop: function () {
    // Dispatch `stop` event.
    this.dispatchEvent({type: 'stop', message: 'Stop engines'});
  }
};

function startEngines(event) {
  console.log(event.message);
}

function stopEngines(event) {
  console.log(event.message);
}

// Apply `eventDispatcher` methods to the prototype of the event target.
eventDispatcher.apply(Object.getPrototypeOf(car));

// Register event listeners to event target.
car
  .addEventListener('start', startEngines)
  .addEventListener('afterStart', startEngines)
  .addEventListener('stop', stopEngines);

// `start` event fires first, then `afterStart` and finally
// after two seconds `stop` events fires.

car.start(function (self) {
  // Dispatch `afterStart` event.
  self.dispatchEvent({type: 'afterStart', message: 'Car has started'});
});

console.log(car.hasEventListener('start', startEngines));      // -> true
console.log(car.hasEventListener('afterStart', startEngines)); // -> true
console.log(car.hasEventListener('stop', startEngines));       // -> false
console.log(car.hasEventListener('stop', stopEngines));        // -> true

setTimeout(function () {
  car.stop();

  // Remove all event listeners from event target.
  car
    .removeEventListener('start', startEngines)
    .removeEventListener('afterStart', startEngines)
    .removeEventListener('stop', stopEngines);
}, 2000);