How do you implement a coupon system in a food ordering app?
Store coupons as { code: discountRate }. When a coupon is applied, calculate the discounted total: total * (1 - discountRate). Show the discount amount and the final total. Handle invalid codes with an error message.
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More FAQs in Food Ordering App: Advanced Features to Impress
Coupon/discount system, item ratings with sort, delivery time estimate, order tracking (preparing -> on the way -> delivered), quantity display in menu, sort options (price, rating), item customization, and localStorage persistence. Add only after core works.
Use localStorage: save with localStorage.setItem('cart', JSON.stringify(cart)) on every cart change. Load with JSON.parse(localStorage.getItem('cart') || '{}') on page load. This persists the cart across page refreshes.
After checkout, show order status: preparing -> on the way -> delivered. Use setInterval to advance the status every few seconds. Update the UI with the current status. Clear the interval when delivered.
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