The useMemo hook memoizes a computed value, preventing recalculation on every render.It’s used to optimize performance for expensive computations. Basic Syntax const memoizedValue = useMemo(() => computeExpensiveValue(a, b), [a, b]);…

The useContext hook allows functional components to access context values directly.It eliminates the need for Context.Consumer components. Basic Syntax const value = useContext(MyContext); Returns the current context value Must be…

What Is React Context API? React Context API allows you to share data across components without passing props manually at every level.It’s useful for themes, authentication, and global state. Basic…

useDeferredValue allows you to defer updates for non-urgent values.It’s useful to avoid blocking the UI when updating large lists or heavy computations. Basic Syntax const deferredValue = useDeferredValue(value); Returns a…

What Is useTransition? The useTransition hook lets you mark state updates as non-urgent, allowing React to keep the UI responsive during heavy updates. Basic Syntax const [isPending, startTransition] = useTransition();…

What Is useEffect Cleanup Function? The cleanup function in useEffect runs when a component unmounts or before re-running the effect.It’s used to clean up side effects like timers, subscriptions, or…

Both hooks deal with refs in React, but their purpose differs: useRef: Provides a mutable object to access DOM elements or store values. useImperativeHandle: Customizes the instance value exposed to…

What Is useReducer? The useReducer hook is an alternative to useState for managing complex state logic.It uses a reducer function to update state based on actions. Basic Syntax const [state,…

useDebugValue allows you to display debug information for custom hooks in React DevTools.It is only for development and does not affect production performance. Basic Syntax useDebugValue(value, formatFunction); value → value…

useLayoutEffect is similar to useEffect but runs synchronously after DOM updates.It’s useful for reading layout, calculating measurements, or synchronizing DOM changes. Basic Syntax useLayoutEffect(() => { // effect logic return…