What is ES5?

ES5 is a shortcut for ECMAScript 5

ECMAScript 5 is also known as JavaScript 5

ECMAScript 5 is also known as ECMAScript 2009

ECMAScript 5

ECMAScript 5 was released in 2009.

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

ECMAScript 5 Syntactical Changes

• Property access [ ] on strings
• Trailing commas in array and object literals
• Multiline string literals
• Reserved words as property names

Browser Support for ES5 (2009)

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

Full ECMAScript 5 Tutorial

This has been a short introduction to ECMAScript 5.

For a full overview go to W3Schools JavaScript ES5 Tutorial.

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