| Hook | Purpose | Basic Usage |
|---|---|---|
useState |
Adds state to function components | const [count, setCount] = useState(0); |
useEffect |
Performs side effects in function components | useEffect(() => { console.log(count); }, [count]); |
useContext |
Accesses values from a React context | const value = useContext(MyContext); |
useReducer |
Manages complex state logic | const [state, dispatch] = useReducer(reducer, initialState); |
useCallback |
Memoizes a callback function | const memoizedFn = useCallback(() => { doSomething(); }, [dep]); |
useMemo |
Memoizes a computed value | const memoizedValue = useMemo(() => computeExpensiveValue(dep), [dep]); |
useRef |
Returns a mutable reference | const inputRef = useRef(null); |
useImperativeHandle |
Customizes the instance exposed by ref
|
useImperativeHandle(ref, () => ({ focus: () => inputRef.current.focus() })); |
useLayoutEffect |
Runs synchronously after DOM mutations | useLayoutEffect(() => { console.log('Layout effect'); }); |
useDebugValue |
Adds debug labels to custom hooks | useDebugValue(isOnline ? 'Online' : 'Offline'); |
| Custom Hooks | Extracts reusable logic into a function | function useFetch(url) { useEffect(() => { fetch(url); }, [url]); } |
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React Hooks Overview
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