Why do I get warnings about updating state after unmount?
Usually because a WebSocket or polling interval is still running after the component unmounts and tries to update state. Always clean up connections and intervals in useEffect to prevent leaks and these warnings.
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More FAQs in Common Mistakes When Adding Advanced Features to a React App
Because they fail or take time, and the developer skipped loading and error states. Always handle all three states: loading, error, and success, so the UI never looks broken during a slow or failed operation.
Because firing a search on every keystroke hits rate limits and hurts performance. Debouncing means the search only runs after the user stops typing, which is cheaper and a better UX.
Likely because it renders every message, growing the DOM unboundedly. Use windowing or cap the list to the latest N messages, removing old ones, so the DOM stays small and the chat stays fast.
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