Javascript versions

JavaScript was first released in 1995 and confirms to ECMAScript (ES) specification. Here is the timeline of JavaScript.

• 1995 - First released
• 2009 - ES5 released
• 2015 - ES6 released
• 2016 - ES7 released
• 2017 - ES8 released
• 2018 - ES9 released
• 2019 - ES10 released

ES5 features - 2009

Here is the list of features added in ES5.

• use strict directive - declare variables explicitly
• String.trim() method added - used to remove white spaces from both ends of String
• Lot of methods added to Array - isArray, foreach, map, filter, reduce, every sum, indexof, lastindexof
• JSON object new methods - parse, stringify
• Date.now() method added
• Object related chnages - getters and setters, adding new property to objects
• Access String property using []
• support for multiline string literals

ES6 features - 2015

Here is the list of features added in ES6.

• let
• const
• Arrow function - similar to lambda in Java
• Class syntax
• Default parameters
• New Array methods - find() and findIndex()
• New Number methods - isFinite() and isNaN()
• map, set, weakmap, weakset

ES7 features - 2016

Here is the list of features added in ES7.

• Array.prototype.includes
• Exponentiation - **