Constructor with javascript

constructor.js

Function.prototype.extend = function (proto) {
    var constructor = proto.constructor;
    constructor.prototype = Object.create(this.prototype, Object.getOwnPropertyDescriptors(proto));
    return constructor;
};

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

var SomeGuy = Person.extend({
  constructor: function (foo) {
    Person.apply(this, arguments);
  },
  method: function () {
  }
});

var dude = new SomeGuy();