JavaScript Introduction

What is JavaScript ?

• JavaScript is the programming language of the Web.
• JavaScript is the world's most popular programming language.

Why Study JavaScript ?

JavaScript is one of the 3 languages all web developers must learn.

• HTML to define the content of web pages.
• CSS to specify the layout of web pages.
• JavaScript to program the behavior of web pages.

History of JavaScript

• JavaScript was invented by Brendan Eich in 1995, and became an ECMA standard in 1997.
• ECMA-262 is the official name of the standard. ECMAScript is the official name of the language
• The Original JavaScript ES1 ES2 ES3 (1997-1999).
• The First Main Revision ES5 (2009).
• The Second Revision ES6 (2015).
• The Yearly Additions (2016, 2017 ... 2021, 2022).

Notes About JavaScript

• You don't have to get or download JavaScript.
• JavaScript is already running in your browser on your computer, on your tablet, and on your smart-phone.
• JavaScript is free to use for everyone.
• JavaScript and Java are completely different languages, both in concept and design.