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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, 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 4Never released


ES5
ECMAScript 5 (2009)
Read More


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




ECMAScript 2016
Read More
Added exponential operator (**)
Added Array.includes()




ECMAScript 2017
Read More
Added string padding
Added Object.entries()
Added Object.values()
Added async functions
Added shared memory
Allows trailing commas for function parameters




ECMAScript 2018
Read More

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




ECMAScript 2019
Read More

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




ECMAScript 2020
Read More

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

Chrome23Nov 2012
Firefox21May 2013
IE9*Mar 2011
IE / Edge10Sep 2012
Safari6Jul 2012
Opera15Jul 2013


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


Browser Support for ES6 (2015)


Browser
Version
Date

Chrome51May 2016
Firefox52Mar 2017
Edge14Aug 2016
Safari10Sep 2016
Opera38Jun 2016


Internet Explorer does not support ECMAScript 2015.










Browser Support for ECMAScript 2016


Browser
Version
Date

Chrome52Jul 2016
Firefox54Jun 2017
Edge14Aug 2016
Safari10.1Mar 2017
Opera39Aug 2016













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+1

Reference: https://www.w3schools.com/js/js_versions.asp