Should I store computed values in useState?
No. If a value can be computed from props or other state, compute it during render. Storing derived values in useState creates synchronization bugs when the underlying source changes.
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More FAQs in Common useState Mistakes That Break Your React App
Usually because you mutated the state variable directly or mutated an object in place instead of creating a new one. React compares references, so always use the setter and replace objects and arrays with new copies.
Because state updates are batched and count is the same stale value for both calls. Use setCount(prev => prev + 1) so each update receives the correct previous value, even when batched together.
Because React tracks hooks by the order they are called. If a hook is inside a condition, the order can change between renders, which breaks React's internal tracking and causes bugs. Always call hooks at the top level.
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