JavaScript Tutorial

1. Introduction to JavaScript

JavaScript is used to:

• Make websites interactive (e.g., dropdown menus, sliders).
• Validate forms.
• Create dynamic content like animations or games.
• Work with backend servers (Node.js).

JavaScript runs in the browser and can also run on servers using tools like Node.js.

2. Writing Your First JavaScript Code

To add JavaScript to an HTML file, use the

Example:

3. Variables and Constants

Variables store data that can change, while constants hold data that won’t change.

Declaring Variables:

4. Data Types

JavaScript has the following data types:

• String: "Hello"
• Number: 42
• Boolean: true or false
• Object: {key: value}
• Array: [1, 2, 3]

Example:

5. Operators

Operators are used to perform operations.

• Arithmetic: +, -, *, /, %
• Comparison: ==, ===, !=,
• Logical: &&, ||, !

Example:

6. Conditional Statements

Control the flow of your program based on conditions.

Example:

7. Loops

Loops let you repeat code blocks.

For Loop:

While Loop:

8. Functions

Functions are reusable blocks of code.

Example:

9. Events and DOM Manipulation

JavaScript can interact with HTML elements via the Document Object Model (DOM).

Example:

10. Practice Examples

1. Basic Calculator:

2. Random Number Generator:

Next Steps:

1. Practice small projects like a To-Do List or a Quiz App.
2. Learn about ES6+ features (e.g., arrow functions, destructuring).
3. Explore AJAX and Fetch API for server communication.