JavaScript Versions
W3Schools Covers All JavaScript Versions
JavaScript, invented by Brendan Eich in 1995, became an ECMA standard in 1997.
ECMAScript is the official name of the JavaScript standard.
From 1997 ECMA versions was abbreviated by numbers. (ES1, ES2, ES3, ES5, ES6).
2016 - 2025, versions are named by year (ECMAScript 2016, 2017, 2018 ... 2025).
ECMAScript Editions
| Official Name | Most Important Features |
|---|---|
| ECMAScript 1 (1997) | First edition |
| ECMAScript 2 (1998) | Only editorial changes |
| ECMAScript 3 (1999) |
Regular expressions try ... catch switch do-while |
| ECMAScript 4 | Never released |
| ECMAScript 5 (2009) Read More |
use strict JSON Support String.trim() Array.isArray() Array iteration methods Allows trailing commas for object literals |
| ECMAScript 6 (2015) Read More |
Added let and const Default parameter values Array.find() Array.findIndex() |
