sample2.js

/*
	Sample 2 (new way)
*/

var Parent = (function(){

	function Parent(msg){
		this.log(msg);
	}

	Parent.prototype.log = function(msg){
		if(window.console) console.log(msg);
	}

	Parent.prototype.val = 10;

	Parent.prototype.getVal = function(){
		return this.val;
	}

	return Parent;

})();

var Child = (function(_super){

	function Child(msg){
		this.log(msg);
	}

	Child.prototype = new _super;

	Child.prototype.val = 100;

	Child.prototype.getVal = function(){
		return _super.prototype.getVal.call(this) + "!";
	}

	return Child;

})(Parent);

var GrandChild = (function(_super){

	function GrandChild(msg){
		this.log(msg);
	}

	GrandChild.prototype = new _super;

	GrandChild.prototype.val = 100000;

	GrandChild.prototype.getVal = function(){
		return _super.prototype.getVal.call(this) + "!!";
	}

	return GrandChild;

})(Child);


var parent = new Parent("new Parent constuctor");
var child = new Child("new Child constuctor");
var grandChild = new GrandChild("new GrandChild constuctor");

parent.log(parent.getVal());
child.log(child.getVal());
grandChild.log(grandChild.getVal());