Modules

Export

// myMath.js

// Default export
export default function add(x, y) {
  return x + y;
}

// Normal export
export function subtract(x, y) {
  return x - y;
}

// Multiple exports
function multiply(x, y) {
  return x * y;
}
function duplicate(x) {
  return x * 2;
}
export { multiply, duplicate };

Import

// main.js
import add, { subtract, multiply, duplicate } from './myMath.js';

console.log(add(6, 2)); // 8
console.log(subtract(6, 2)) // 4
console.log(multiply(6, 2)); // 12
console.log(duplicate(5)) // 10

// index.html
<script type="module" src="main.js"></script>

Export Module

// myMath.js

function add(x, y) {
  return x + y;
}
function subtract(x, y) {
  return x - y;
}
function multiply(x, y) {
  return x * y;
}
function duplicate(x) {
  return x * 2;
}

// Multiple exports in node.js
module.exports = {
  add,
  subtract,
  multiply,
  duplicate,
};

Require Module

// main.js
const myMath = require("./myMath.js");

console.log(myMath.add(6, 2)); // 8
console.log(myMath.subtract(6, 2)); // 4
console.log(myMath.multiply(6, 2)); // 12
console.log(myMath.duplicate(5)); // 10

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