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Introduction to JavaScript
Beginner
50 XP
15 min
Lesson Content
What is JavaScript?
JavaScript is a programming language that makes web pages interactive and dynamic. It's the only programming language that runs natively in web browsers!
Why JavaScript is Powerful
- 🎯 Interactivity: Respond to user clicks, form inputs, and more
- 🔄 Dynamic Content: Update page content without reloading
- 🌐 Universal: Runs in browsers, servers, mobile apps
- 📈 In-Demand: Most popular programming language
What Can JavaScript Do?
- ✨ Create interactive websites
- 🎮 Build games and animations
- 📱 Develop mobile applications
- 🖥️ Create desktop applications
- 🤖 Build AI and machine learning apps
- 🌐 Develop server-side applications
Your First JavaScript
JavaScript can display messages, perform calculations, and much more:
console.log('Hello, World!');
alert('Welcome to JavaScript!');Example Code
Write JavaScript code that displays messages and performs simple calculations!
// Welcome to JavaScript!
// This is a comment - it doesn't run as code
// Display a message in the console
console.log('Hello, JavaScript!');
console.log('I am learning to code!');
// Perform some calculations
console.log('Math is fun:');
console.log('5 + 3 =', 5 + 3);
console.log('10 * 2 =', 10 * 2);
// Work with text (strings)
let myName = 'Student';
console.log('My name is:', myName);
console.log('Welcome to coding,', myName + '!');Expected Output:
Hello, JavaScript! I am learning to code! Math is fun: 5 + 3 = 8 10 * 2 = 20 My name is: Student Welcome to coding, Student!
Study Tips
- •Read the theory content thoroughly before practicing
- •Review the example code to understand key concepts
- •Proceed to the Practice tab when you're ready to code