Day_5_Arrow_Functions_Solution.js

/**
 * Author: itsHally
 * File: Day_5_Arrow_Functions_Solution.js
 * Folder Path: HackerRank/10 Days Of JavaScript/Day 5/
 * Note: The problem statement is not originally mine. I only solved this challenge on HackerRank.
 * Source: https://www.hackerrank.com/domains/tutorials/10-days-of-javascript
 * 
 * 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, 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 <= nums(i) <= 100, where nums(i) is the i^th 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.
 */

'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) => { 
        if (n % 2 == 0) {
            return n * 2;
        } else {
            return n * 3;
        }
    });
    
}

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