How would you implement a custom useDebounce hook using useState and useEffect?
It tests effect cleanup and stale closure awareness. Use useState for the debounced value, useEffect to set a setTimeout when the input changes, and return a cleanup calling clearTimeout. Omitting cleanup leaks timers and fires stale values.
It tests whether you understand effect lifecycles, cleanup semantics, and stale closures in React. A strong implementation stores the debounced value in useState, triggers a setTimeout inside useEffect whenever the source value or delay changes, and returns a cleanup function that calls clearTimeout to abort the pending timer. A red flag is skipping cleanup or omitting the delay from the dependency array, which causes memory leaks, timer collisions, or updates with captured stale state.
Read the original → telerik.com
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