JavaScript Versions

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JavaScript

Versions

JavaScript was invented by Brendan Eich in 1995, and
became an ECMA standard
in 1997.

ECMAScript is the official name of the language.

ECMAScript versions have been abbreviated to ES1, ES2, ES3, ES5, and ES6.

Since 2016 new versions are named by year (ECMAScript 2016 / 2017 / 2018).

ECMAScript Editions

Ver Official Name Description
ES1 ECMAScript 1 (1997) First edition
ES2 ECMAScript 2 (1998) Editorial changes
ES3 ECMAScript 3 (1999) Added regular expressions
Added try/catch
ES4 ECMAScript 4 Never released
ES5 ECMAScript 5 (2009) Added “strict mode”
Added JSON support
Added String.trim()
Added Array.isArray()
Added Array iteration methods
ES6 ECMAScript 2015 Added let and const
Added default parameter values
Added Array.find()
Added Array.findIndex()
ECMAScript 2016 Added exponential operator (**)
Added Array.prototype.includes
ECMAScript 2017 Added string padding
Added Object.entries
Added Object.values
Added async functions
Added shared memory
ECMAScript 2018 Added rest / spread properties
Added asynchronous iteration
Added Promise.finally()
Additions to RegExp

This tutorial covers every version of JavaScript:

  • The Original JavaScript ES1 ES2 ES3 (1997-1999)
  • The First Main Revision ES5 (2009)
  • The Second Revision ES6 (2015)
  • The Yearly Additions (2016, 2017, 2018)

Browser Support

ECMAScript 1 – 6 is fully supported in all modern browsers.


Browser Support for ES5 (2009)

Browser Version From Date
Chrome 23 Nov 2012
Firefox 21 May 2013
IE 9* Mar 2011
IE / Edge 10 Sep 2012
Safari 6 Jul 2012
Opera 15 Jul 2013

* Internet Explorer 9 does not support ECMAScript 5 “use strict”.


Browser Support for ES6 (2015)

Browser Version Date
Chrome 51 May 2016
Firefox 52 Mar 2017
Edge 14 Aug 2016
Safari 10 Sep 2016
Opera 38 Jun 2016

Internet Explorer does not support ECMAScript 2015.




Browser Support for ECMAScript 2016

Browser Version Date
Chrome 52 Jul 2016
Firefox 54 Jun 2017
Edge 14 Aug 2016
Safari 10.1 Mar 2017
Opera 39 Aug 2016