JS: Module. Import Export Example.

Example. Named Export

here's a sample library file math.js:

// file name: math.js
const f1 = ((x) => (x + 1));
const f2 = ((x) => (x + 2));
export { f1, f2 };

here's a JavaScript file main.js that import the math file:

// file name: main.js
import { f1, f2 } from "./math.js";

console.log("Calling f1 from module. Result is" , f1(1));

And here's the HTML to load the main.js

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

note, the type="module" is required.

Example. Default Export

// file name: chemistry.js

// export a object

export default {
  f1: ((x) => x + 1),
  f2: ((x) => x + 2),
};

// note, no name is given to the object

// file name: main.js

// import a value from chemistry.js , and name it g

import g from "./chemistry.js";

console.log(g.f1(1));

And here's the HTML to load the main.js

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