What is ES5

ES5 is a shortcut for ECMAScript 5

ECMAScript 5 Features

These were the new features released in 2009:

The "use strict" Directive

String.trim()

Array.isArray()

Array.forEach()

Array.map()

Array.filter()

Array.reduce()

Array.reduceRight()

Array.every()

Array.some()

Array.indexOf()

Array.lastIndexOf()

JSON.parse()

JSON.stringify()

Date.now()

Property Getters and Setters

New Object Property Methods

Property access [ ] on strings

Trailing commas in array and object literals

Multiline string literals

Reserved words as property names

Chrome 23, IE 10, and Safari 6 were the first browsers to fully support ECMAScript 5:


Chrome 23	IE10 / Edge	Firefox 21	Safari 6	Opera 15
Sep 2012	Sep 2012	Apr 2013	Jul 2012	Jul 2013

Internet Explorer 9 (March 2011) supports ES 5 except for "use strict".

This has been a short introduction to ECMAScript 5.

For a full overview of JavaScript versions go to JavaScript Versions.

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