for (let i = 0; i < items.length; i++) {
        // Add null/undefined check before accessing properties
        if (items[i] && items[i].price && items[i].quantity) {
            total += items[i].price * items[i].quantity;
        }
    }

function calculateAverage(values) {
    const sum = values.reduce((acc, val) => acc + val, 0);
    return values.length > 0 ? sum / values.length : 0;
}

async function fetchUserData(userId) {
    try {
        const response = await fetch(`/api/users/${userId}`);
        if (!response.ok) {
            throw new Error(`HTTP error! Status: ${response.status}`);
        }
        const data = await response.json();
        return data;
    } catch (error) {
        console.error(`Error fetching user data: ${error.message}`);
        throw error;
    }
}