JavaScript basics for absolute beginners.

JavaScript is a robust programming language that is commonly used for web development. It helps you create dynamic and interactive web pages.

The foundations of JavaScript are as follows: Print Hello World

JavaScript allows you to either include your code internally in an HTML file or externally in a different JavaScript file.

1. Internal JavaScript

In this method, using the `<script>` tags, you can write your JavaScript code directly into the HTML document.

Example:

2. External JavaScript

With this technique, you can create a separate JavaScript file with the `.js` extension and link it to the HTML file.

To add the path to the external JavaScript file, use the `<script>` tag with the `src` attribute.

Example:

2. Comments

JavaScript comments are used to add explanatory or descriptive notes to the code. The JavaScript interpreter ignores comments, so they do not affect how the program runs. You can use comments to clarify your code, add reminders, or temporarily disable specific code blocks.

There are two types of comments in JavaScript:

 Single line comments

Single-line comments are usually used as short notes.

// This is an example of single line comment

let x = 3; // Assigning value to variable x

 Multi-line comments

You can add both single-line and multi-line comments using this method. Multi-line comments are also known as block comments.

3. Variables

Variables are used to store data. You can declare Variables using `var`, `let`, or `const`. Any type of data can be stored inside a JavaScript variable once it has been created.

Variables serve as containers for values of different types, such as objects, strings, booleans, numbers, and more.

Here's an example of how you can use different variables:

var age;

let name;

const PI = 3.14;

Variables have scope and can be named with specific rules.

4. Data Types