JavaScript - ECMAScript Versions

1

ECMAScript 1 (1997)

First Edition.

2

ECMAScript 2 (1998)

Editorial changes only.

3

ECMAScript 3 (1999)

Added Regular Expressions.
Added try/catch.

4

ECMAScript 4

Never released.

5

ECMAScript 5 (2009)

Read More: JS ES5

Added “strict mode”.
Added JSON support.
Added String.trim().
Added Array.isArray().
Added Array Iteration Methods.

5.1

ECMAScript 5.1 (2011)

Editorial changes.

6

ECMAScript 2015

Read More: JS ES6

Added let and const.
Added default parameter values.
Added Array.find().
Added Array.findIndex().

7

ECMAScript 2016

Added exponential operator (**).
Added Array.prototype.includes.

8

ECMAScript 2017

Added string padding.
Added new Object properties.
Added Async functions.
Added Shared Memory.

9

ECMAScript 2018

Added rest / spread properties.
Added Asynchronous iteration.
Added Promise.finally().
Additions to RegExp.