Your question is Implement Custom Hooks for Complex Logic. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Describe the implementation of custom hooks to abstract complex logic
Explain how you would identify logic suitable for a custom hook, preserve React's Hooks rules, manage state and side effects, expose a clear return contract, and compose built-in hooks such as useState, useEffect, useMemo, and useCallback. Include a small implementation example and discuss cleanup, dependency arrays, and testing. Scope your answer to modern React function components and JavaScript or TypeScript.