Named Exports in JavaScript for Arithmetic Operations

Named Exports:

Write a JavaScript module that exports multiple named functions for basic arithmetic operations.

Solution-1:

JavaScript Code:

File: arithmetic.js

// --- file: arithmetic.js ---
// Export named functions for arithmetic operations
export function add(a, b) {
  return a + b;
}

export function subtract(a, b) {
  return a - b;
}

export function multiply(a, b) {
  return a * b;
}

export function divide(a, b) {
  if (b === 0) {
    throw new Error('Division by zero is not allowed');
  }
  return a / b;
}

File: app.js

// --- file: app.js ---
// Import specific functions
import { add, subtract, multiply, divide } from './arithmetic.js';

// Use the imported functions
console.log(add(10, 5));         
console.log(subtract(10, 5));    
console.log(multiply(10, 5));    
console.log(divide(10, 5));  

Output:

15
5
50
2

Explanation:

• arithmetic.js exports four named functions.
• app.js selectively imports the required functions using named imports.
• Each function performs a basic arithmetic operation, and the divide function includes error handling for division by zero.

Solution-2:

JavaScript Code:

File: mathOperations.js

// --- file: mathOperations.js ---
// Export functions inline during definition
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) => (b !== 0 ? a / b : 'Cannot divide by zero');

File: main.js

// --- file: main.js ---
// Import all functions as an alias
import * as mathOps from './mathOperations.js';

// Use the imported functions
console.log(mathOps.add(7, 3)); 
console.log(mathOps.subtract(7, 3));
console.log(mathOps.multiply(7, 3));
console.log(mathOps.divide(7, 0)); 

Output:

10
4
21
Cannot divide by zero

Explanation:

• mathOperations.js defines and exports functions inline using arrow syntax.
• main.js imports all named exports as a single object using the alias 'mathOps'.
• This approach groups all related functions under one namespace, making the code modular and organized.

For more Practice: Solve these Related Problems:

• Write a JavaScript module that exports multiple named functions for basic arithmetic (add, subtract, multiply, divide) and test each operation in another file.
• Write a JavaScript module that exports named functions for converting temperatures between Celsius and Fahrenheit, and use them in a calculator page.
• Write a JavaScript module that exports two named functions: one to check if a number is prime and another to generate prime numbers up to a given limit.
• Write a JavaScript module that exports named functions to perform string manipulations (reverse, capitalize, and trim) and use them to format user input.

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