https://babeljs.io/ https://babeljs.io/ gives a fairly good introduction to it, and allows you to use a lot of ES6 (and a couple of experimental ES7) features a

https://babeljs.io/ https://babeljs.io/ gives a fairly good introduction to it, and allows you to use a lot of ES6 (and a couple of experimental ES7) features already. Has an in-browser repl to play around with it as well if you like.