clazz.js

## clazz.js
(function(root) {

	var current = {
		parent: null,
		config: null,
	};

	function clazz(name) {

		function Class(config) {
			if (this instanceof Class)
				return this.init.apply(this, arguments);

			current.parent = Class;
			current.config = config || {};
		}

		Class.classname = name;

		function result(proto) {
			Class.prototype = proto || Class.prototype;
			window[name] = Class;
		}

		result.valueOf = function valueOf() {
			var config = current.config;
			var proto = Object.create(current.parent.prototype);

			Object.keys(config).forEach(function(prop) {
				proto[prop] = config[prop];
			});

			proto.constructor = Class;
			Class.prototype = proto;
			window[name] = Class;
		};

		return result;
	}

	root.clazz = clazz;

})(this);

## test.js
clazz('Person')({
	init: function() {
		this.greet('normal person');
	},
	greet: function(what) {
		console.log("Hi, I'm a " + what);
	}
});

clazz('Ninja') << Person ({
	init: function() {
		this.greet('super ninja!');
	}
});

var test = new Ninja();