YDKJS 2: Getting started: Appendix B: Practicing Comparisons Problem Solution

schedule-meeting.js

const dayStart = "07:30";
const dayEnd = "17:45";

function scheduleMeeting(startTime,durationMinutes) {
    let [startHour, startMin] = startTime.split(':');
    let durationHour = Math.floor(durationMinutes / 60);
    let durationLeftMin = durationMinutes - durationHour * 60;
    let [endStart, endMin] = [0,0];    

    endHour = +startHour + durationHour;
    endMin = +startMin + durationLeftMin;

    if(endMin >= 60) {
        endHour += 1;
        endMin -= 60;
    }

    const withZero = (num) => Number(num) < 10 ? `0${num}` : `${num}`;

    const newStartTime = `${withZero(startHour)}:${withZero(startMin)}` 
    const endTime = `${withZero(endHour)}:${withZero(endMin)}`;

    return newStartTime >= dayStart && endTime <= dayEnd;
}

scheduleMeeting("7:00",15);     // false
scheduleMeeting("07:15",30);    // false
scheduleMeeting("7:30",30);     // true
scheduleMeeting("11:30",60);    // true
scheduleMeeting("17:00",45);    // true
scheduleMeeting("17:30",30);    // false
scheduleMeeting("18:00",15);    // false