oop - How do I make JavaScript Object using a variable String to define the class name?

Question

Here's what I'm trying to do -- this is pseudo code and doesn't work. Does anyone know how to accomplish this for real:

// Define the class
MyClass = Class.extend({});

// Store the class name in a string
var classNameString = 'MyClass';

// Instantiate the object using the class name string
var myObject = new classNameString();

Answer 1

Would it work if you did something like this:

var myObject = window[classNameString];

..?