Why Study JavaScript?

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

   1. HTML to define the content of web pages

   2. CSS to specify the layout of web pages

   3. JavaScript to program the behavior of web pages

 

JavaScript and Java are completely different languages, both in concept and design.

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.

Web pages are not the only place where JavaScript is used. Many desktop and server programs use JavaScript. Node.js is the best known. Some databases, like MongoDB and CouchDB, also use JavaScript as their programming language.

 

Learn JavaScript in 3 hours by freeCodeCamp.org

 

Crash Course to learn JavaScript

 

JavaScript directly with the browser

 

Modern Javascript Tutorial    by the Net Ninja

12:26 Modern JavaScript Tutorial #1 - Intro & Setup

1:24:18 Modern JavaScript Tutorial #2 - Syntax Basics & Types

53:00 Modern JavaScript Tutorial #3 - Control Flow

43:34 Modern JavaScript Tutorial #4 - Functions

37:36 Modern JavaScript Tutorial #5 - Objects

53:39 Modern JavaScript Tutorial #6 - The Document Object Model

 

Object Oriented Javascript   by the Net Ninja

7:31 Object Oriented JavaScript Tutorial #1 - Introduction

6:49 Object Oriented JavaScript Tutorial #2 - Object Literals

6:27 Object Oriented JavaScript Tutorial #3 - Updating Properties

5:10 Object Oriented JavaScript Tutorial #4 - Classes

5:38 Object Oriented JavaScript Tutorial #5 - Class Constructors

3:35 Object Oriented JavaScript Tutorial #6 - Class Methods

5:12 Object Oriented JavaScript Tutorial #7 - Method Chaining

8:53 Object Oriented JavaScript Tutorial #8 - Class Inheritance

6:16 Object Oriented JavaScript Tutorial #9 - Constructors (under the hood)

8:24 Object Oriented JavaScript Tutorial #10 - Prototype

16:26 Object Oriented JavaScript Tutorial #11 - Prototype Inheritance

 

EXAMPLE

<script src="/sandbox.js"></script>

</body>

sandbox.js

alert('hello,world');

console.log(1);

console.log(2);

let age = 25;

let year = 2019;

console.log(age, year);

age = 30;

console.log(age);

const age = 25