Day 5: Arrow Functions | 10 Days Of JavaScript | HackerRank Solution

Hello coders, today we are going to solve Day 5: Arrow Functions HackerRank Solution which is a part of 10 Days of JavaScript Series.

Objective

In this challenge, we practice using arrow functions.

Task

Complete the function in the editor. It has one parameter: an array, nums. It must iterate through the array performing one of the following actions on each element:

• If the element is even, multiply the element by 2.
• If the element is odd, multiply the element by 3.

The function must then return the modified array.

Input Format

The first line contains an integer, n, denoting the size of nums.
The second line contains n space-separated integers describing the respective elements of nums.

Constraints

• 1 <= n <= 10
• 1 <= numsi <= 100, where numsi is the ith element of nums.

Output Format

Return the modified array where every even element is doubled and every odd element is tripled.

Sample Input 0

5
1 2 3 4 5

Sample Output 0

3 4 9 8 15

Explanation 0

Given nums = [1, 2, 3, 4, 5], we modify each element so that all even elements are multiplied by 2 and all odd elements are multipled by 3. In other words, [1, 2, 3, 4, 5] = [1*3, 2*2, 3*3, 4*2, 5*3] = [3, 4, 9, 8, 15]. We then return the modified array as our answer.

Solution – Day 5: Arrow Functions

'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.trim().split('\n').map(string => {
        return string.trim();
    });
    
    main();    
});

function readLine() {
    return inputString[currentLine++];
}

/*
 * Modify and return the array so that all even elements are doubled and all odd elements are tripled.
 * 
 * Parameter(s):
 * nums: An array of numbers.
 */
function modifyArray(nums) {
    const func = nums.map(function (num){
        if (num % 2 == 0){
            return 2 * num;
        } else {
            return 3 * num;
        }
    });
    return func;
}


function main() {
    const n = +(readLine());
    const a = readLine().split(' ').map(Number);
    
    console.log(modifyArray(a).toString().split(',').join(' '));
}

Disclaimer: The above Problem (Arrow Functions) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.