How do you calculate the cart total in a food ordering app?
Sum price * quantity for each item in the cart: Object.entries(cart).reduce((sum, [id, qty]) => { const item = menu.find(m => m.id === parseInt(id)); return sum + item.price * qty; }, 0).
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More FAQs in How to Build a Food Ordering App in a Machine Coding Interview
Create a menu array, a cart object (item ID to quantity), search and filters. Render the filtered menu and cart sidebar. Handle add/remove from cart, quantity changes, and total calculation. Handle empty cart and no results. This is a real Swiggy interview question.
Use an object mapping item ID to quantity: cart = { 1: 2, 3: 1 }. addToCart increments the quantity. removeFromCart deletes the key. Calculate total by summing price * qty for each item in the cart.
Filter the menu array based on search query (name includes query), veg/non-veg flag, category, and price range. Re-render the menu on every filter change. Show 'No items found' if the filtered list is empty.
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