'new' keyword and Object.create

nuevo.js

// nuevo(Klass, [arg, ...]) is roughly the same as
// new Klass(arg, ...)
//
// This should (hopefully) illustrate the relationship between
// Object.create and 'new'
//
// new Constructor ties together
//  - creating an instance of the prototype
//  - initializing it
//  - possibly returning a totally different value
//
// Object.create(obj) does only the first, and guaruntees
// that obj.isPrototypeOf(Object.create(obj))
function nuevo(Constructor, args) {
    // clone the prototype
    var instance = Object.create(Constructor.prototype);

    // Run the constructor
    var result = Constructor.apply(instance, args);

    // if the constructor returns a value,
    // return that value
    // otherwise return the instance
    return result != null ? result : instance;
}

// As a counter point, Object.create can be defined (again roughly) in
// terms of the 'new' keyword
function create(obj) {
    var F = function () {};
    F.prototype = obj;
    return new F();
}