What is CommonJS and how is it used in JavaScript?

What is CommonJS and how is it used in JavaScript?

CommonJS is a module format that allows you to organize JavaScript code into reusable modules. It defines a standard for structuring and loading modules.

Can you give me an example of how to use CommonJS?

Sure! You can create a module by exporting a function or variable using module.exports, and then import it using require. For example:

// math.js module.exports = function add(a, b) { return a + b; };

// app.js const add = require('./math'); console.log(add(2, 3)); // Outputs: 5

What are the advantages of using CommonJS?

CommonJS allows for better code organization, reusability, and easier dependency management. It also works well with Node.js.

Are there any alternatives to CommonJS?

Yes, ES Modules (ESM) is a modern alternative that is now widely supported in browsers and Node.js. It uses import and export syntax.