How does state cause a re-render in React?
When you call the state setter, React schedules a re-render, compares the new state to the old, and updates the DOM to match the new UI description. This is how the UI stays in sync with the data.
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More FAQs in Props and State Interview Questions for React Developers
Props are inputs passed from a parent and are read-only inside the child. State is internal data owned by the component that can change and trigger re-renders. Props are external inputs; state is internal memory.
No. Props are read-only. If the data needs to change, the parent updates its state and passes new props down. Mutating props breaks React's one-way data flow and leads to bugs.
React batches updates for performance, so multiple setters in the same event are applied together in a single re-render. This avoids wasteful intermediate renders and improves efficiency.
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