• Share code among JavaScript files.
• exporting parts of a file for use in one or more other files,
• importing the parts you need, where you need them.

• In order to take advantage of this functionality, you need to create a script in your HTML document with a type of module.

  • <script type='module' src='filename.js'></script>

Export module

// Export a single function
export const add = (x, y) => x + y;

// or place them all in the export statement
export { add, subtract };

If only one value is exported from a file, use export default

Import module

• import will find add and subtract in math.js.
• import only two functions to use, and ignore the rest.

// to import specific functions
import { add, subtract } from './math.js';

• import * as

  • import everything from a file
  • use function like module.func

// to import all
import * as myMathModule from './math.js';

myMathModule.add(2, 5);
myMathModule.subtract(10, 3);

• import func from './module.js';

  • import a default export