Santas Holiday

function santasHoliday(input) {
    let days = Number(input[0]) - 1;
    let type = input[1];
    let rating = input[2];
    let price = 0;

    if (days > 0) {
        if (type == "room for one person") {
            price = 18;
        } else if (type == "apartment") {
            price = 25;

            if (days < 10) {
                price *= 0.7;
            } else if (days > 15) {
                price *= 0.5;
            } else {
                price *= 0.65;
            }
        } else if (type == "president apartment") {
            price = 35;

            if (days < 10) {
                price *= 0.9;
            } else if (days > 15) {
                price *= 0.8;
            } else {
                price *= 0.85;
            }
        }

        if (rating == "positive") {
            price *= 1.25;
        } else {
            price *= 0.9;
        }

        price *= days;
    }

    console.log(`${price.toFixed(2)}`);
}


РЕШЕНИЕ С IF И ТЕРНАРЕН ОПЕРАТОР:

function santasHoliday(input) {
    let days = Number(input[0]) - 1;
    let type = input[1];
    let rating = input[2];
    let price = 0;

    if (days > 0) {
        price = type == "room for one person" ? 18 : type == "apartment" ? 25 : 35;

        if (days < 10) {
            price *= type == "apartment" ? 0.7 : type == "president apartment" ? 0.9 : 1;
        } else if (days > 15) {
            price *= type == "apartment" ? 0.5 : type == "president apartment" ? 0.8 : 1;
        } else {
            price *= type == "apartment" ? 0.65 : type == "president apartment" ? 0.85 : 1;
        }

        price *= days * (rating == "positive" ? 1.25 : 0.9);
    }
    console.log(`${price.toFixed(2)}`);
}


РЕШЕНИЕ САМО С ТЕРНАРЕН ОПЕРАТОР:

function santasHoliday(input) {
    let days = Number(input[0]) - 1;
    let type = input[1];
    let rating = input[2];

    let price = days > 0 ? ((type == "room for one person" ? 18 : type == "apartment" ? 25 : 35) *
            (days < 10 ? (type == "apartment" ? 0.7 : type == "president apartment" ? 0.9 : 1) :
            days > 15 ? (type == "apartment" ? 0.5 : type == "president apartment" ? 0.8 : 1) :
            (type == "apartment" ? 0.65 : type == "president apartment" ? 0.85 : 1)) *
            (rating == "positive" ? 1.25 : 0.9) * days) : 0;

    console.log(`${price.toFixed(2)}`);
}