01. Computer Store

function computerStore(input) {
    let totalPrice = 0, price;

    let command = input.shift();

    while (command != "special" && command != "regular") {
        price = Number(command);
        if (price > 0) {
            totalPrice += price;
        } else {
            console.log("Invalid price!")
        }
        command = input.shift();
    }

    if (totalPrice == 0) {
        console.log("Invalid order!");
    } else {
        console.log("Congratulations you've just bought a new computer!");
        console.log(`Price without taxes: ${totalPrice.toFixed(2)}$`);
        console.log(`Taxes: ${(totalPrice / 5).toFixed(2)}$`);
        console.log("-".repeat(11));
        console.log(`Total price: ${(totalPrice * 1.2 * (command === "special" ? 0.9 : 1)).toFixed(2)}$`);
    }
    return;
}