Refactoring off the hook(s)
summary
Refactors a small color-picker app and shows concrete before-and-after code: replaces one big state object with multiple useState calls, moves complex logic into useReducer, and synchronizes URL and cursor with useEffect. Extracts shared logic into a custom hook and a provider so subscriptions are registered once. Demonstrates unit testing of hooks, reports the UI becomes simpler and less boilerplate, and shows the refactored app working live with the URL and history sync intact.
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