JavaScript Versions

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

Allows trailing commas for function parameters

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 Added switch Added do-while
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 Allows trailing commas for object literals
ES6	ECMAScript 2015	Added let and const Added default parameter values Added Array.find() Added Array.findIndex()
	ECMAScript 2016	Added exponential operator (**) Added Array.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)
• Yearly Additions (2016, 2017, 2018)

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Browser Support

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

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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".

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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.

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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

Practice Excercise Practice now