js10-date.js

// Tutorials > 10 Days of Javascript > Day 6: JavaScript Dates
// Write a JavaScript function that retrieves the day of the week from a given date.
//
// https://www.hackerrank.com/challenges/js10-date/problem
// challenge id: 21015
//

'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) ----------------------------------------------------------------------

// The days of the week are: "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
function getDayName(dateString) {
    let dayName;
    // Write your code here

    let d = new Date(dateString);

    const dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
    dayName = dayNames[d.getDay()];

    return dayName;
}

// (skeliton_tail) ----------------------------------------------------------------------
function main() {
    const d = +(readLine());

    for (let i = 0; i < d; i++) {
        const date = readLine();

        console.log(getDayName(date));
    }
}