How do you handle quantity 0 in a food ordering app cart?
When decrementing, check if the quantity drops to 0 or below. If so, delete the item from the cart: if (cart[id] <= 0) delete cart[id]. This keeps the cart clean and prevents negative quantities.
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More FAQs in Food Ordering App: Edge Cases and Testing
Empty cart (show message), no search results (show message), quantity 0 (remove from cart), decimal prices (use toFixed), clear cart button, and checkout confirmation. These show production-readiness.
Test manually: add items to cart, change quantity, remove items, search, apply filters, verify empty cart message, verify no results message, clear cart, and checkout. Test each feature and edge case before submitting.
Calculate the total normally, then format with toFixed(2): total.toFixed(2). This ensures two decimal places (e.g., 150.50 instead of 150.5). Use parseFloat when reading prices to avoid string concatenation.
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