what are modules in JS

Table of contents

What ?

• A module it a just file just contain code.(function,class,variable)
• In You are all the code only one file that handle it very complex that why we use module.
• In js we have 2 types of module
  • CommonJS (default module)
  • ES6 (change in package.json type:module)

How ?

I have one file that write a function to calculat sum of two numbers.

• this is sum.js file

const sum = (a, b) => {
  return a + b;
};

export { sum }; //   named export import {sum} from './sum.js';    // both name must be same

export default sum; // default export import sumFun from './sum.js';   // you can use any name you wnat

• This is my main.js file

import { sum } from "./sum.js";

console.log(sum(2, 3));

Why ?

• This makes you code organzied, reusable and maintainable.
• This makes your code easy to read and understand.
• This makes your code easy to test and debug.

Conclusion

• Modules are you code dividend into small pieces( files). that helps you to reuse code.