Import Aliases in JavaScript Modules

Import with Alias:

Write a JavaScript programme that imports named exports from a module using alias names and use them in another file.

Solution-1: Using ES6 Module Syntax

JavaScript Code:

File: mathUtils.js

// mathUtils.js
// Exporting functions from mathUtils.js
export const add = (a, b) => a + b; // Adds two numbers
export const subtract = (a, b) => a - b; // Subtracts two numbers

File: main.js

// main.js
// Importing named exports with alias
import { add as sum, subtract as difference } from './mathUtils.js';

// Using the imported functions with their aliases
console.log(sum(5, 3)); // Logs the sum of 5 and 3
console.log(difference(5, 3)); // Logs the difference of 5 and 3

Output:

8
2

Explanation:

• The add and subtract functions are exported from mathUtils.js.
• These functions are imported into main.js with alias names (sum and difference).
• The aliases are used to call the functions, making the code more descriptive or better aligned with the current context.

Solution-2: Using CommonJS Syntax

JavaScript Code:

File: mathUtils.js

// mathUtils.js
// Exporting functions using CommonJS syntax
exports.add = (a, b) => a + b; // Adds two numbers
exports.subtract = (a, b) => a - b; // Subtracts two numbers

File: main.js

//main.js
// Importing named exports with alias
const { add: sum, subtract: difference } = require('./mathUtils.js');

// Using the imported functions with their aliases
console.log(sum(10, 7)); // Logs the sum of 10 and 7
console.log(difference(10, 7)); // Logs the difference of 10 and 7

Output:

17
3

Explanation:

• The add and subtract functions are exported using CommonJS syntax (exports).
• In main.js, these functions are imported and renamed using object destructuring with aliases (sum and difference).
• The renamed aliases are then used in the script.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that imports named exports from a module using alias names and then calls them with the aliases.
• Write a JavaScript program that renames imported math functions (e.g., add as sum, multiply as product) and uses them to perform calculations.
• Write a JavaScript program that imports several functions with alias names and logs their outputs to verify the alias mapping.
• Write a JavaScript program that imports named exports using aliases and then aggregates them into a new object for further processing.

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