Hooks vs Class Components Class Components: Use state and lifecycle methods inside ES6 classes. Hooks (Functional Components): Use useState, useEffect, and other hooks in functions for state and side effects.…

What Are React Portals? React Portals allow you to render a component outside the parent DOM hierarchy while maintaining the React tree.Useful for modals, tooltips, or overlays. Basic Syntax ReactDOM.createPortal(child,…

React Memo vs useMemo vs useCallback React.memo: Wraps a component to prevent unnecessary re-renders if props are unchanged. useMemo: Memoizes computed values to avoid recalculating on every render. useCallback: Memoizes…

Suspense vs Error Boundary Suspense: Handles loading states for lazy-loaded components or data fetching. Error Boundary: Catches runtime errors in component tree and displays fallback UI. Suspense Example import React,…

Prop Drilling vs Context API Prop Drilling: Passing data through multiple component levels via props. Context API: Provides global state accessible by any component in the subtree, avoiding prop drilling.…

The useCallback hook memoizes a function so it is only recreated when dependencies change.It helps prevent unnecessary re-renders of child components. Basic Syntax const memoizedCallback = useCallback(() => { //…

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]);…