Advanced React Hooks: Techniques for the Skilled Developer

1. Mastering React Hooks 10 Advanced Concepts Every Pro Should Know

2. Custom Hooks: Build Reusable Logic Custom hooks extract component logic into reusable function useWindowSize() { const [size, setSize] = useState({ width: window.innerWidth, height: window.innerHeight }); functions, following the "use" naming convention. They enable sharing stateful logic across components without prop drilling or wrapper components. Best practices include keeping hooks focused on useEffect(() => { const handleResize = () => { setSize({ width: window.innerWidth, height: window.innerHeight }); }; window.addEventListener('resize', handleResize); return () => window.removeEventListener( 'resize', handleResize); }, []); single responsibilities and returning values that components need. return size; }

3. Performance Optimization Techniques useMemo useCallback React.memo Memoizes expensive calculations, Returns a memoized callback Wraps components to skip re- recomputing only when dependencies function, preventing unnecessary renders when props haven't change. Perfect for complex re-renders when passing callbacks changed. Combine with useCallback transformations or filtering large to optimized child components. for maximum efficiency. datasets.

4. Advanced Hook Patterns 1 useReducer for Complex State Manages intricate state logic with actions and reducers, similar to Redux but component-scoped. Ideal when useState becomes unwieldy with 2 useContext for Global State multiple related state updates. Eliminates prop drilling by sharing data across component trees. Combine with useReducer for a 3 useRef Beyond DOM powerful state management solution without external libraries. Store mutable values that persist across renders without triggering re-renders. Perfect for 4 useImperativeHandle tracking previous values, timers, or storing instances. Customizes the instance value exposed to parent components when using ref. Provides precise control over what methods or properties are accessible.

5. Rules & Best Practices Hook Rules Pro Tips Only call hooks at the top level4never inside loops, Keep effects focused4split complex effects into conditions, or nested functions multiple useEffect calls Only call hooks from React function components or Always specify dependency arrays to prevent infinite custom hooks loops Use the ESLint plugin for hooks to catch violations Name custom hooks descriptively with the "use" prefix automatically Test custom hooks independently using React Testing Library