Most Asked React Interview Questions (58 Pages)

Description

Most Asked React Interview Questions (58 Pages)

🔹 𝗥𝗲𝗮𝗰𝘁 𝗙𝘂𝗻𝗱𝗮𝗺𝗲𝗻𝘁𝗮𝗹𝘀
↳ JSX
↳ Components (Functional vs. Class)
↳ Props and State

🔹 𝗥𝗲𝗮𝗰𝘁 𝗟𝗶𝗳𝗲𝗰𝘆𝗰𝗹𝗲
↳ Mounting, Updating, Unmounting
↳ Lifecycle methods vs. Hooks (e.g., ComponentDidMount vs. useEffect)

🔹 𝗛𝗼𝗼𝗸𝘀
↳ Core Hooks: useState, useEffect
↳ Advanced Hooks: useContext, useRef, useReducer
↳ Bonus: useMemo, useCallback

🔹 𝗦𝘁𝗮𝘁𝗲 𝗠𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁
↳ Context API (simpler global state management)
↳ Redux
↳ Alternatives like React Query

🔹 𝗥𝗼𝘂𝘁𝗶𝗻𝗴
↳ Basics of React Router
↳ Handling dynamic and nested routes
↳ Programmatic navigation

🔹 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻
↳ Code Splitting (React.lazy, Suspense)
↳ Memoization (React.memo, useMemo)
↳ Avoiding unnecessary re-renders

🔹 𝗦𝘁𝘆𝗹𝗶𝗻𝗴 𝗶𝗻 𝗥𝗲𝗮𝗰𝘁
↳ CSS-in-JS (e.g., styled-components, Emotion)
↳ Frameworks like Tailwind CSS
↳ Best practices for inline and external styles

🔹 𝗘𝗿𝗿𝗼𝗿 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴
↳ Error Boundaries (when to use them)

🔹 𝗙𝗼𝗿𝗺𝘀 𝗮𝗻𝗱 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗶𝗼𝗻𝘀
↳ Controlled vs. Uncontrolled Components
↳ Libraries like Formik or React Hook Form

🔹 𝗔𝗣𝗜𝘀 𝗮𝗻𝗱 𝗔𝘀𝘆𝗻𝗰𝗵𝗿𝗼𝗻𝗼𝘂𝘀 𝗖𝗼𝗱𝗲
↳ Fetching data with useEffect
↳ Libraries like Axios or Fetch
↳ Handling loading and error states effectively

🔹 𝗧𝗲𝘀𝘁𝗶𝗻𝗴
↳ Unit testing with Jest
↳ Component testing with React Testing Library

🔹 𝗘𝗰𝗼𝘀𝘆𝘀𝘁𝗲𝗺 𝗮𝗻𝗱 𝗕𝘂𝗶𝗹𝗱 𝗧𝗼𝗼𝗹𝘀
↳ Webpack, Babel
↳ Create React App (CRA) vs. Vite
↳ Managing Environment Variables