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by wmitty 3862 days ago
Another crazy excellent (and free) ES6 reference is http://exploringjs.com/es6/ by Dr. Axel Rauschmayer - one of the ES6 committee members.

JS is a very complicated language - and the language spec in written in a way - that while I am sure is excellent for implementors and compatibility - is pretty much unreadable by language users.

Axel's book is quite authoritative and very readable. You may still go to the spec for finer points - but it sure is 10,000 times easier if you mostly understand the mechanism (and motivations) first.