Earlier javascript was not having any feature to import and export javascript but since the discovery of ECMAScript 6 (or ES6) you can use the export or import statement in a JavaScript file to export or import variables, functions, classes, or any other entity to/from other JS files.

Suppose we have two files named script.js and app.js and you want to export variables and functions script.js to app.js Then in the “script.js” file you need to write the export statement as shown in the following example:

Example :
let message = “Hi How are you doing?”;
const PI = 3.14;

function addNumbers(a, b){
return a + b;
}

// Exporting variables and functions
export { message, PI, addNumbers };

And in the “app.js” file you need to write the import statement as shown below:

import { message, PI, addNumbers } from ‘./script.js’;

console.log(message); // Prints to the console : Hi How are you doing?
console.log(PI); // Prints to the console : 3.14
console.log(addNumbers(10, 10)); // Prints to the console : 20