ES6 - Harmony Draft Specification

Ok, I will be honest and admit that the actual JavaScript/ECMAScript ES6 draft specification is not the most interesting thing to read, but if you really want to know JavaScript you have to have it. And it is free, so why not? Download a PDF version from: ES6 Draft Specification PDF. Read it online at: ES6 Online Draft Specification. Keep in mind that while the specification is expected to be ratified this year, there is no guarantee that there won't be changes between now and then.