Food Ordering App: Advanced Features to Impress

Food Ordering App: Advanced Features to Impress

Beyond the basics, here are advanced features that can impress the interviewer if you have time.

1. Coupon/Discount System

const coupons = { SAVE10: 0.1, SAVE20: 0.2 };
function applyCoupon(code) {
  if (coupons[code]) {
    const discount = calculateTotal() * coupons[code];
    return calculateTotal() - discount;
  }
  return calculateTotal();
}
``
### 2. Item Ratings

Display a star rating for each item:

```js
menu: [{ id: 1, name: "Pizza", price: 200, rating: 4.5 }]
``
Sort by rating (highest first).

### 3. Delivery Time Estimate

```js
function getDeliveryTime() {
  return Math.floor(Math.random() * 30) + 20; // 20-50 min
}
``
### 4. Order Tracking

After checkout, show an order status: preparing -> on the way -> delivered.

```js
const statuses = ["Preparing", "On the way", "Delivered"];
let orderStatus = 0;
function trackOrder() {
  setInterval(() => {
    if (orderStatus < statuses.length - 1) {
      orderStatus++;
      renderOrderStatus();
    }
  }, 5000);
}
``
### 5. Quantity in Menu

Show the current quantity in the menu's "Add" button:

```js
const qty = cart[item.id] || 0;
button.textContent = qty > 0 ? `Add (${qty})` : "Add";
``
### 6. Sort Options

```js
function sortItems(items, sortBy) {
  if (sortBy === "price-low") return items.sort((a, b) => a.price - b.price);
  if (sortBy === "price-high") return items.sort((a, b) => b.price - a.price);
  if (sortBy === "rating") return items.sort((a, b) => b.rating - a.rating);
  return items;
}
``
### 7. Item Customization

Allow adding notes or extras (cheese, sauce) to each item.

### 8. Persistence with localStorage

```js
function saveCart() { localStorage.setItem("cart", JSON.stringify(cart)); }
function loadCart() { cart = JSON.parse(localStorage.getItem("cart") || "{}"); }
``
### The Takeaway

Advanced features to impress: coupon/discount system, item ratings with sort, delivery time estimate, order tracking (preparing -> on the way -> delivered), quantity in menu, sort options (price, rating), item customization, and localStorage persistence. Add these only after the core works and edge cases are handled.