What is the hardest part of the food ordering app in a Swiggy interview?
The cart logic. Managing add, remove, quantity change, and total calculation. Use an object mapping item ID to quantity. Handle quantity 0 (remove from cart). Calculate total by summing price * qty for each item.
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More FAQs in Food Ordering App: Swiggy Interview Experience
Build a food ordering app with a menu, search, filters (veg/non-veg, category, price), cart (add, remove, quantity), cart total, and checkout. 90 minutes. They evaluate functionality, code quality, edge cases, UI, and approach.
How would you scale for 10,000 items (virtualization, pagination, server-side search)? How would you persist the cart (localStorage, backend)? How would you handle concurrent updates (optimistic UI)? How would you add coupons (discount code on total)?
10 min: plan data and state. 40 min: build menu rendering and cart. 20 min: add search and filters. 10 min: handle edge cases. 10 min: CSS and testing. Build cart logic first (it is the hardest part).
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