JavaScript Introduction

JavaScript is the most popular scripting language on the Internet. This language can be used for HTML and the web, and is more widely used on servers, PCs, laptops, tablets, and smartphones.

JavaScript is a scripting language

JavaScript is a lightweight programming language.

JavaScript is programming code that can be inserted into HTML pages.

JavaScript is inserted into HTML pages and can be executed by all modern browsers.

JavaScript is easy to learn.

What you will learn

Here are the main things you will learn in this tutorial.

ECMAScript version

JavaScript has been standardized by ECMA (European Computer Manufacturers Association) through ECMAScript.

year name Description
1997 ECMAScript 1 First version
1998 ECMAScript 2 Version changes
1999 ECMAScript 3 Add regular expressions
Add try /catch
ECMAScript 4 Not published
2009 ECMAScript 5 Add "strict mode", strict mode
Add JSON support
2011 ECMAScript 5.1 Version changes
2015 ECMAScript 6 Add classes and modules
2016 ECMAScript 7 Add exponential operator (**)
Add Array.prototype.includes

ECMAScript 6 is also known as ECMAScript 2015.

ECMAScript 7 is also known as ECMAScript 2016.