Building an app or preparing for a JavaScript interview? From Programming with Mosh channel Watch this ES6 tutorial to learn ES6 quickly.
ECMAScript 2015 or ES2015 is a significant update to the JavaScript programming language. It is the first major update to the language since ES5 which was standardized in 2009.
From Programming with Mosh channel
I do recommend you see this post to learn a few bits of ES6 new features.