What are modules and why are they useful?

Modules are reusable pieces of code that can be imported and exported between different files in a project. They help in organizing code, making it more maintainable and scalable. By using modules, you can avoid global namespace pollution and manage dependencies more effectively. In JavaScript, you can use import and export statements to work with modules.

// myModule.js
export const myFunction = () => {
  console.log("Hello, World!");
};

// main.js
import { myFunction } from "./myModule.js";
myFunction(); // Outputs: Hello, World!