JS cool features

gistfile1.js

function SpaceShip(pilot, maxSpeed) {
	this.pilot = pilot;
	this.maxSpeed = maxSpeed;
}

SpaceShip.UPDATE_PILOT = "updatePilot";

SpaceShip.prototype.updatePilot = function (newAge, newSkill) {
	var notifier = Object.getNotifier(this);
	var self = this;
	notifier.performChange(SpaceShip.UPDATE_PILOT, function() {
		self.pilot.age = newAge;
		self.pilot.skill = newSkill;
	}, this);
	notifier.notify({
		object : self,
		type : SpaceShip.UPDATE_PILOT,
		newPilot : self.pilot
	});
}


var ship = new SpaceShip({
		name : "Mark",		
		age : 20,
		skill : 50
	}, 792);

Object.observe(ship, function(updates){
	console.log("Ship updated ", updates)
}, [SpaceShip.UPDATE_PILOT])

ship.updatePilot(21, 75);
console.log("Ship in the end ", ship)