What Are Error Boundaries? Error boundaries are React components that catch JavaScript errors anywhere in their child component tree, log them, and display a fallback UI instead of crashing the…

What Are React Portals? React Portals allow you to render components outside the main DOM hierarchy of the parent component.This is useful for modals, tooltips, and overlays. Basic Syntax ReactDOM.createPortal(child,…

What Exactly Are React Fragments? React Fragments are a specialized feature in React that allow you to group a list of children without adding extra nodes to the DOM. Think…

What Is useMemo Hook? The useMemo hook memoizes the result of a computation so that it is only recalculated when dependencies change.It is useful for expensive calculations in functional components.…

What Is useCallback Hook? The useCallback hook memoizes a function so that it is not recreated on every render. It’s useful when passing functions to memoized child components to avoid…

What Is React Memo? React.memo is a higher-order component that helps optimize functional components by preventing unnecessary re-renders when props do not change. Basic Syntax const MemoizedComponent = React.memo(Component); Example…

What Is React Context API? The React Context API allows you to share state globally across components without passing props manually at every level. It’s ideal for themes, user authentication,…

React Router is a library for routing in React apps. It allows you to navigate between different components without reloading the page, creating a single-page application (SPA) experience. Installing React…

What Are Custom Hooks? Custom hooks are functions that start with use and allow you to reuse stateful logic across multiple functional components in React. Why Use Custom Hooks Reuse…

What Is useRef Hook? The useRef hook allows you to access DOM elements directly or store mutable values that persist across renders without causing re-renders. Basic Syntax const refContainer =…