We all know this language as JavaScript, but the official name is ECMAScript. The most recent official Ecma Standard is called ES5 (ECMAScript Language Specification Edition 5.1). It was published in June 2011 by TC39 (Ecma Technical Committee 39) – the committee evolving JavaScript. Focused development of the sixth edition started earlier in 2009, as the fifth edition was still being prepared for publication. It was initially named ES.next, but it’s widely known as ES6. This year new official name was announced ES2015 (The 2015 ECMAScript Language Specification). This is because TC39 plans to publish new version of JavaScript with small set of changes each year from now on. The final ES6 draft was published on April 14, 2015 and spec is frozen now. Formal publication is expected to be done in June 2015. Before that will happen it is already possible to get familiar with unofficial HTML version of the ES6 working draft. However I strongly recommend to check first very concise overview of ECMAScript 6 features. Another excellent resource to start with is ECMAScript 6 new features overview & comparison website that presents ES5 equivalent code next to ES6 code.
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