JavaScript Modules Tutorial 💻

JavaScript modules are essential for organizing code in modern web development. This guide explains how to use modules effectively in your projects.

What Are JavaScript Modules? 📦

Modules allow you to split code into reusable components. Key features include:

• Encapsulation of functionality
• Namespacing to avoid global pollution
• Lazy loading of code
• Tree shaking for optimized builds

📌 Example: Use import and export statements to manage module dependencies.

Core Concepts 🧠

1. ES6 Modules (default in modern browsers)
   • Use .mjs file extensions
   • Syntax:

     // Export  
     export function example() { ... }  
     
     // Import  
     import { example } from './module.js';  
     

2. CommonJS (Node.js legacy)
   • Syntax:

     // Export  
     module.exports = { example };  
     
     // Import  
     const { example } = require('./module.js');  
     

3. Module Types
   • ES6 Module (recommended)
   • AMD (Asynchronous Module Definition)
   • UMD (Universal Module Definition)

Practical Use Cases 🛠️

• Organizing large codebases
• Reusing code across projects
• Splitting UI components
• Managing third-party libraries

🚀 Tip: Always use type="module" in HTML when importing ES6 modules.

Expand Your Knowledge 📚

For deeper insights into module systems, check our Module Systems tutorial.