>Anyone knows where I could get free documentation on the new implementation of javascript?
>
>I mean the Javascript can now have classes and lots of other nice things. I have old javascript books but I don't have the new additions to Javascript in those books.

Mozillla has good documentation:

https://developer.mozilla.org/en-US/docs/Web/JavaScript
https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/ECMAScript_6_support_in_Mozilla

Don't know your situation but you might look at TypeScript. It gives pretty good encapsulation and type safety and, if you have a C# background will be more intuitive. And looking at the JavaScript generated by TypeScript should give you an insight into good native JavaScript practices.....