Prototypal inheritance with automatic initialization in JavaScript

object.extend.js

"use strict"; //Remove if using non-strict compatible libraries.

(function (undefined) {
    if (typeof Object.create !== 'function') {
        Object.create = function (o) {
            function F() {}
            F.prototype = o;
            return new F();
        };
    }

    var createMethod = function () {
        var obj = Object.create(this);
        obj.initialize.apply(obj, arguments);

        return obj;
    };

    function createBasePrototype(prototype) {
        if (prototype.initialize === undefined) {
            prototype.initialize = function () {};
        }

        prototype.create = createMethod;

        return prototype;
    }

    function createDerivedPrototype(parent, atributes) {
        var prototype = Object.create(parent);

        for (var propertyName in atributes) {
            prototype[propertyName] = atributes[propertyName];
        }

        if (! prototype.hasOwnProperty('initialize')) {
            prototype.create = createMethod;
        } else {
            prototype.create = function () {
                var obj = Object.create(this),
                    args = Array.prototype.slice.call(arguments);

                args = [parent].concat(args);
                obj.initialize.apply(obj, args);

                return obj;
            };
        }

        return prototype;
    }

    Object.extend = function () {
        if (arguments[1] === undefined) {
            return createBasePrototype(arguments[0]); 
        } else {
            return createDerivedPrototype(arguments[0], arguments[1]);
        }
    };

})();


var Person = Object.extend({
    initialize: function (name) {
        this.name = name;
    },

    name: "no-name"
});

var Superhero = Object.extend(Person, {
    initialize: function (parent, name, realName) {
        parent.initialize.call(this, name);
        this.realName = realName;
    },

    realName: "no-real-name"
});

var john = Person.create("John Doe"),
    superMan = Superhero.create("Superman", "Clark Kent");