Question

[1,2,3,4,5,6,7,8].even() for Node.js

a) Filtering even numbers in an array using Node.js
b) Sorting an array in Node.js
c) Calculating the sum of even numbers in an array using Node.js

Answer 1

To filter even numbers in an array using Node.js, use the filter method. To sort an array in Node.js, use the sort method. To calculate the sum of even numbers in an array using Node.js, use the filter and reduce methods.

Step-by-step explanation:

Filtering even numbers in an array using Node.js

To filter even numbers in an array using Node.js, you can use the filter method along with an arrow function. Here's an example:

const numbers = [1, 2, 3, 4, 5, 6, 7, 8];
const evenNumbers = numbers.filter(num => num % 2 === 0);
console.log(evenNumbers); // Output: [2, 4, 6, 8]

Sorting an array in Node.js

To sort an array in Node.js, you can use the sort method. Here's an example:

const numbers = [1, 4, 3, 2, 6, 5, 8, 7];
numbers.sort((a, b) => a - b);
console.log(numbers); // Output: [1, 2, 3, 4, 5, 6, 7, 8]

Calculating the sum of even numbers in an array using Node.js

To calculate the sum of even numbers in an array using Node.js, you can use the same approach of filtering even numbers and then using the reduce method to calculate the sum. Here's an example:

const numbers = [1, 2, 3, 4, 5, 6, 7, 8];
const evenNumbers = numbers.filter(num => num % 2 === 0);
const sum = evenNumbers.reduce((acc, curr) => acc + curr, 0);
console.log(sum); // Output: 20