Local & Component State

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1. 1 When would you choose `useReducer` over `useState`, and what does it buy you? Medium
2. 2 What's the difference between controlled and uncontrolled components, and when is each better? Medium
3. 3 How does `useState`'s functional updater form prevent stale-state bugs? Medium
4. 4 Why can lifting state up hurt performance, and how do you mitigate it? Medium
5. 5 What's the difference between `useRef` and `useState` for holding a value across renders? Easy