To define named exports in a JavaScript module, we use the export keyword followed by the name of the entity we want to export. Let’s look at an example:

// mathUtils.js

export const add = (a, b) => a + b;
export const subtract = (a, b) => a - b;
export const multiply = (a, b) => a * b;
export const divide = (a, b) => a / b;

In the above code, we have defined four named exports: add, subtract, multiply, and divide. These are functions that perform basic mathematical operations.

To import these exports in another JavaScript file, we use the import keyword followed by the name of the exported entity, enclosed in curly braces {}. Here’s how we can import and use these named exports:

// main.js

import { add, subtract, multiply, divide } from './mathUtils.js';

console.log(add(5, 3)); // Output: 8
console.log(subtract(10, 4)); // Output: 6
console.log(multiply(2, 6)); // Output: 12
console.log(divide(15, 3)); // Output: 5

In the above code, we import the named exports add, subtract, multiply, and divide from the mathUtils.js module using the relative path './mathUtils.js'. We can then use these functions in our main.js file.

Alternatively, we can use the * symbol to import all named exports as properties of a single object. Here’s how the import statement would look:

// main.js

import * as mathUtils from './mathUtils.js';

console.log(mathUtils.add(5, 3)); // Output: 8
console.log(mathUtils.subtract(10, 4)); // Output: 6
console.log(mathUtils.multiply(2, 6)); // Output: 12
console.log(mathUtils.divide(15, 3)); // Output: 5

In the above code, we import all the named exports from mathUtils.js and assign them to the mathUtils object. We can then access each export using dot notation.

Named exports provide great flexibility when working with JavaScript modules. By exporting specific entities and selectively importing them, we can keep our code modular, maintainable, and reusable.

#JavaScript #Modules