Modules

As your app grows, you shouldn't keep all code in one file. Modules let you share code between files.

Exporting Code

You can export variables, functions, or classes from a file (e.g., math.js).

// math.js
export const pi = 3.14159;

export function add(a, b) {
  return a + b;
}

// Default export
export default function multiply(a, b) {
  return a * b;
}
          

Importing Code

Bring the exported code into another file (e.g., main.js).

// main.js
import multiply, { pi, add } from './math.js';

console.log(add(2, 3));
console.log(multiply(4, 5));
          

Practice

Related Guides

• Classes