MastereveryReact Hook.
From useState to useImperativeHandle, every hook explained with working examples, pitfalls, and the mental models that make them click.
Mogamat Yaseen Kannemeyer
Author · React 18+ · Next.js App Router
Choose a hook
Each guide covers the mental model, common pitfalls, and a live interactive demo — so you understand not just the API, but the why.
useStateStore and update values inside a function component. The hook every React developer learns first.
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useEffectFetch data, subscribe to events, manipulate the DOM — and clean up after yourself.
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useRefAccess DOM nodes directly or hold a mutable value that survives renders without triggering a re-render.
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useContextConsume shared state anywhere in the component tree — no prop drilling required.
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useReducerCentralise complex state logic into a pure reducer function. The useState alternative for non-trivial state.
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useMemoCache the result of an expensive calculation — only recompute when dependencies change.
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useCallbackMemoize a function so child components don't re-render unnecessarily when the parent does.
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useLayoutEffectLike useEffect but fires synchronously before the browser paints. Use it to avoid layout flicker.
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useImperativeHandleExpose a custom API from a child component to its parent via ref — without lifting state.
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useTransitioncoming soonMark a state update as non-urgent so React can keep the UI responsive while it processes.
useDeferredValuecoming soonDefer re-rendering a part of the UI so urgent updates like typing feel instant.
useIdcoming soonGenerate unique, stable IDs that are consistent between server and client — perfect for accessibility attributes.
useSyncExternalStorecoming soonSubscribe to an external store (like Redux or a browser API) in a way that's safe for concurrent rendering.
useInsertionEffectcoming soonInject styles into the DOM before any layout effects fire. Designed for CSS-in-JS library authors.
useOptimisticcoming soonShow an optimistic UI update immediately while an async action is in flight, then reconcile the real result.
useDebugValuecoming soonAdd a label to a custom hook so it shows useful information in React DevTools.