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, versions are named by year (ECMAScript 2016, 2017, 2018, 2019, 2020).

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
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
Allows trailing commas for function parameters

 

ECMAScript 2018

?

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

 

ECMAScript 2019

?

String.trimStart()
String.trimEnd()
Array.flat()
Object.fromEntries
Optional catch binding

 

ECMAScript 2020

?

The Nullish Coalescing Operator (??)

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, 2019, 2020)


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

 


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