touristShop.js

function touristShop(input) {
    let index = 0;
    let budget = Number(input[index]);
    index++;
    let command = input[index];
    index++;
    let productCounter = 0;
    let totalCost = 0;
    let canPay = true;
    let havePurchase = false;

    while (command !== "Stop") {
        if (command === undefined) {
            break;
        }
        let productPrice = Number(input[index]);
        index++;
        productCounter++;
        havePurchase = true;

        if (productCounter % 3 === 0) {
            productPrice /= 2;
        }

        totalCost += productPrice;
        budget -= productPrice;

        if (budget < 0) {
            canPay = false;
            console.log(`You don't have enough money!`);
            console.log(`You need ${Math.abs(budget).toFixed(2)} leva!`);
            break;
        }

        command = input[index];
        index++;
    }
    if (canPay && havePurchase) {
        console.log(`You bought ${productCounter} products for ${totalCost.toFixed(2)} leva.`);
    }
}

touristShop(["153.20", "Backpack", "25.20", "Shoes", "54", "Sunglasses", "30"])
touristShop(["54", "Thermal underwear", "24", "Sunscreen", "45"]);