ECMAScript 6 ( ES6 ) then and later renamed to ECMAScript 2015 is the 6th edition of the ECMAScript Language Specification ¶
Description ¶
The 6th edition, initially known as ECMAScript 6 (ES6) then and later renamed to ECMAScript 2015, was finalized in June 2015.
This update adds significant new syntax for writing complex applications, including class declarations (class Foo { … }), ES6 modules like:
import * as moduleName from "...";
export const Foo,
but defines them semantically in the same terms as ECMAScript 5 strict mode.
Other new features include iterators and for…of loops, Python-style generators, arrow function expression (() => {…}), let keyword for local declarations, const keyword for constant local declarations, binary data, typed arrays, new collections (maps, sets and WeakMap), promises, number and math enhancements, reflection, proxies (metaprogramming for virtual objects and wrappers) and template literals for strings.
The complete list is extensive.
As the first “ECMAScript Harmony” specification, it is also known as “ES6 Harmony.”
ES6 features ¶
See also