Day 5: Arrow Functions : 10 Days Of Javascript HackerRank Solution

Problem:-

Objective

In this challenge, we practice using arrow functions. Check the attached tutorial for more details.

Task

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

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

The function must then return the modified array.

Input Format

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

Constraints

• , where  is the  element of .

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 , we modify each element so that all even elements are multiplied by  and all odd elements are multipled by . In other words, . We then return the modified array as our answer.

Solution:-

'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) {

return nums.map(n => n = (n % 2 == 0) ? n * 2 : n * 3);

}

function main() {

const n = +(readLine());

const a = readLine().split(' ').map(Number);

console.log(modifyArray(a).toString().split(',').join(' '));

}