Pochivka i suma

function whileDemo(input) {
    let neededMoney = Number(input[0]);//2000
    let availableMoney = Number(input[1]);//1000
    let index = 2;
    let command = input[index];//2
    let totalDays = 0;
    let spendDays = 0;

    while (availableMoney < neededMoney) {

        totalDays++;
        index++;//3

        if (command === 'spend') {

            spendDays++;

            if (spendDays === 5) {
                console.log("You can't save the money.");
                console.log(totalDays);
                break;
            }
            let moneyToSpend = Number(input[index]);//index 3

            availableMoney -= moneyToSpend;
            if (availableMoney < 0) {
                availableMoney = 0;
            }

        } else if (command === 'save') {
            spendDays = 0;
            let moneyToSave = Number(input[index]);
            availableMoney += moneyToSave;
        }
        index++;
        command = input[index];
    }

    if (availableMoney >= neededMoney) {
        console.log(`You saved the money for ${totalDays} days.`);
    }
}
whileDemo(["2000",
    "1000",
    "spend", "1200", "save", "2000"]);