Klass

The Klass library can make sure JavaScript supports class inheritance just by including one extra script in your page's header.

The library implements class inheritance following the general model other ECMAScript-based programming languages have used.

Why does this matter so much? Because class inheritance in one of the basic features of OOP (Object-Oriented Programming), a crucial feature if planning to developer more advanced or more complex JS-based applications.

Klass works with both client-side and server-side environments, so you can use it both in Node.js applications and inside a browser.

Klass is also Ender compatible.

Requirements:

• JavaScript enabled on client side
• Node.js 0.4.0 or higher (for server side environments)