Introduction to JavaScript

JavaScript Fundamentals

Introduction to JavaScript

Beginner Lesson 1 of 10

Introduction to JavaScript

JavaScript is the programming language of the web, enabling interactive and dynamic websites.

Why Learn JavaScript?

• Universal - Runs in every web browser
• Full-Stack - Frontend, backend (Node.js), mobile, desktop
• Large Ecosystem - npm has over 2 million packages
• High Demand - One of the most sought-after skills

Your First JavaScript

// In the browser console or a .js file
console.log("Hello, World!");

// Variables
let name = "Alice";
const age = 25;

// Function
function greet(person) {
  return `Hello, ${person}!`;
}

console.log(greet(name)); // Hello, Alice!

Running JavaScript

In the Browser

1. Open DevTools (F12)
2. Go to Console tab
3. Type JavaScript and press Enter

With Node.js

# Install from nodejs.org
node --version

# Run a file
node script.js

# Interactive mode
node