Introduction to JavaScript

JavaScript is one of the most powerful and widely-used programming languages in the world. It adds life to websites, making them dynamic, interactive, and responsive.

Whether you want to build beautiful frontend designs or powerful backend systems — JavaScript is a must-learn language for every developer.

Why Learn JavaScript?

  • Beginner-friendly & easy to start
  • Runs directly in your browser
  • Essential for frontend & backend development
  • Works with modern frameworks like React, Node.js, Vue.js, and Next.js
  • Huge demand in the tech industry

What Can JavaScript Do?

  • Make websites interactive
  • Handle form validations
  • Create animations & effects
  • Fetch data from APIs
  • Build mobile apps & games
  • Power server-side applications

How JavaScript Works Behind the Scenes

Every browser has its own JavaScript Engine that runs your code.

Browser JavaScript Engine
Google Chrome V8
Firefox SpiderMonkey
Safari JavaScriptCore
Edge Chakra

Tools Setup for JavaScript Development

1. Text Editor / IDE

Recommended → Visual Studio Code (VS Code)

Download here → https://code.visualstudio.com/

Features:

  • Easy to use
  • Syntax highlighting
  • Extensions & Plugins
  • Integrated Terminal
  • Debugging support

2. Browser

Recommended → Google Chrome or Firefox

Reason → They have powerful developer tools for testing & debugging your code.

3. Node.js & NPM (Optional but Recommended)

Download here → https://nodejs.org/

Check Installation:

node -v
npm -v

4. Live Server Extension (VS Code)

  • Helps you run your HTML + JS projects live in the browser.
  • Install it from VS Code Extensions.

How To Write JavaScript

Inline JavaScript in HTML 

console.log("Hello, JavaScript!");

External JavaScript File 

<span class="na">src="script.js">

Then in script.js:

console.log("Hello from external JS file!");

Basic JavaScript Syntax Example 

// Output to console
console.log("Welcome to JavaScript!");

// Variables
let name = "Dhanian";

// Display variable
console.log(name);

Extra Resource for You!

Take this JavaScript Ebook → Perfect for Beginners to Advanced!

Grab your copy here:

👉 https://codewithdhanian.gumroad.com/l/jjpifd

This ebook covers everything you need to learn JavaScript properly with examples, explanations, and projects.

Conclusion

Congrats 🎉

You have successfully completed Day 1 of your JavaScript journey!

Today you learned:

  • What JavaScript is
  • Why it's important
  • How it works
  • How to set up your tools
  • How to write your first JavaScript code

Up Next → Day 2: JavaScript Core Concepts Cheatsheet

→ Stay consistent.

→ Keep practicing.

→ JavaScript is fun if you stick to it!