07.Working Hours

function workingHours(input) {
    let hour = Number(input[0]);
    let day = input[1];

    if (hour >= 10 && hour <= 18) {
        switch (day) {
            case "Monday":
            case "Tuesday":
            case "Wednesday":
            case "Thursday":
            case "Friday":
            case "Saturday":
                console.log("open");
                break;
            default:
                console.log("closed");
                break;
        }
    } else {
        console.log("closed");
    }
}

ИЛИ:

function workingHours(input) {
    let hour = Number(input[0]);
    let day = input[1];

    if (hour >= 10 && hour <= 18 && day !== "Sunday" ) {
        console.log("open");
    } else {
        console.log("closed");
    }
}

Тарикатско решение с тернарен оператор:)

function workingHours(input) {
    let hour = Number(input[0]);
    let day = input[1];

    console.log(hour >= 10 && hour <= 18 && day !== "Sunday" ? "open" : "closed");
}