Constructor argument: new WeakSet(null) ( Firefox 37).Constructor argument: new WeakMap(null) ( Firefox 37).optional iterable argument in WeakMap constructor ( Firefox 36).Monkey-patched add() in Constructor ( Firefox 37).Constructor argument: new Set(null) ( Firefox 37).Set iteration with for.of ( Firefox 17).Monkey-patched set() in Constructor ( Firefox 37).Constructor argument: new Map(null) ( Firefox 37).

Map iteration with for.of ( Firefox 17).

New Map and Set objects, and their weak counterparts

Array iteration with for.of ( Firefox 13).

Standard library Additions to the Array object It will also appear as the international industry standard ISO/IEC 16262:2016.Ī PDF and HTML version of the standard can be freely downloaded on .Ī channel for feedback on ECMAScript standards is es-discuss. Finally, ECMA-262 Edition 6 got officially approved and published as a standard on Jby the ECMA General Assembly.

In August 2014, the ECMAScript 2015 draft specification was feature frozen and went through a stabilization and bug fixing period. It defines the standard for the JavaScript implementation in SpiderMonkey, the engine used in Firefox and other Mozilla applications.Ĭode-named 'ES.next', 'Harmony', or 'ECMAScript 6', the first working draft (based on ECMAScript 5.1) was published on Jas 'ES.next'. ECMAScript 2015 is the sixth edition of the ECMAScript Language Specification standard.

Ecmascript 2015