The answer
No. If a value can be computed from props or existing state, compute it during render. Storing derived values causes sync bugs when the underlying source changes and the stored copy does not update.
Common State Management Mistakes in Large React Apps
Should I store values computed from other state?
More FAQs in Common State Management Mistakes in Large React Apps
Because UI flags and form state often belong in local component state. Putting everything in Redux adds complexity and re-renders without benefit. Use Redux only for genuinely shared, complex, frequently-updated state.
Because server state has caching, invalidation, and loading concerns that client state does not. Treating fetched data like client state means you lose these. Use React Query or RTK Query for server state and keep client state separate.
Use Context for deeply shared data instead of threading props through every intermediate component. Context lets distant components access shared data without prop drilling.
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