CloneIt.js

A minimal utility for creating objects with an inheritance chain

// create an object

var Shape = CloneIt.clone({
	sides 0,
	hasArea: true
});

var Rectangle = Shape.clone({
	sides: 4,
	// init function is called when using 'create'
	init: function(x, y){
		this.x = x;
		this.y = y;
	},
	area: function () {
		return this.x * this.y;
	}
});

// create an 'instance' using 'create'
// this call the `init` method
var rect1 = Rectangle.create(3, 4);

rect1.area(); //=> 12
rect1.hasArea; //=> true (call forwarded to parent object)