js10-arrows.js

// Tutorials > 10 Days of Javascript > Day 5: Arrow Functions
// Practice using Arrow Functions in JavaScript.
//
// https://www.hackerrank.com/challenges/js10-arrows/problem
// challenge id: 21891
//

'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++];
}
// (skeliton_head) ----------------------------------------------------------------------

/*
 * 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) {
    let ans = nums.map(x => (x % 2 == 0) ? x * 2 : x * 3);
    return ans;
}

// (skeliton_tail) ----------------------------------------------------------------------
function main() {
    const n = +(readLine());
    const a = readLine().split(' ').map(Number);

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