JavaScript Modules
JavaScript Modules are a standardized system for organizing and reusing code in JavaScript applications by splitting functionality into separate files that can be imported and exported. They enable better code structure, dependency management, and encapsulation, reducing global namespace pollution. Modern JavaScript supports two main module systems: ES Modules (native to browsers and Node.js) and CommonJS (primarily used in Node.js).
Developers should learn JavaScript Modules to build scalable, maintainable applications by modularizing code, which improves collaboration and testing. They are essential for modern web development with frameworks like React or Vue, and for Node.js backends to manage dependencies efficiently. Use cases include creating reusable libraries, structuring large applications, and enabling tree-shaking for optimized bundle sizes in production builds.