JavaScript Interview Questions

Modules in JavaScript are reusable pieces of code that can be exported from one program and imported for use in another. They help in organizing and managing code by encapsulating functionality, reducing dependencies, and enhancing maintainability. ES6 introduced native support for modules, which can be imported and exported using the import and export keywords.

Here is an example demonstrating the use of modules:

// module.js
export function greet(name) {
    return `Hello, ${name}`;
}

export const pi = 3.14;

// main.js
import { greet, pi } from './module.js';

console.log(greet('John')); // 'Hello, John'
console.log(pi); // 3.14

In this example, greet and pi are exported from module.js and imported into main.js, demonstrating how to use modules to organize code and share functionality between different parts of an application.