Hackerrank | 10 Days of Javascript | Day 5-Solution in JS | Arrow-Functions-Hackerrank-Solution-in-JS

Hackerrank | 10 Days of Javascript | Day 5-Solution in JS | Arrow-Functions-Hackerrank-Solution-in-JS

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.

https://www.hackerrank.com/challenges/js10-arrows/problem

Day 5: Arrow Functions Solution in JS

'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(num => num * (num % 2 === 0 ? 2 : 3));
}


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