Best practice of prototype inheritance

// Best practice of prototype inheritance 
function new_constructor(initializer, methods, extend) {
    var prototype = Object.create(typeof extend === 'function'    ? extend.prototype : extend);    if (methods) {
        methods.keys().forEach(function (key) {
            prototype[key] = methods[key];        });    }
    function constructor() {
        var that = Object.create(prototype);        if (typeof initializer === 'function') {
            initializer.apply(that, arguments);        }
        return that;    }
    constructor.prototype = prototype;    prototype.constructor = constructor;    return constructor;}

var gizmo = new_constructor(Object, function (id) {
    this.id = id;}, {
    toString: function () {
        return "gizmo " + this.id;    }
});
var hoozit = new_constructor(gizmo, function (id) {
    this.id = id;}, {
    test: function (id) {
        return this.id = id;    }
});