JS: ECMAScript New Features. 2015 to 2026

By Xah Lee. Date: 2019-04-27. Last updated: 2025-05-24.

What is ecmascript, ecma-262

ECMAScript is the specification name for JavaScript.
ECMAScript is also known as ECMA-262, because it's number 262 of the spec organization called Ecma International.

ECMAScript 2015 (aka ES6, ES2015, JS2015) is a major revision of the JavaScript language.
ECMAScript 2015 is also known as ECMAScript 6 (ES6), because it is edition 6.

New version each year

Since 2015, new features are added to JavaScript the language each year.