30 Reactjs interview questions

30 questions that cover a broad spectrum of React.js:

✅ What is React.js, and what problem does it solve in web development?

✅ How does React differ from other JavaScript frameworks or libraries?

✅ What is JSX, and why is it commonly used in React?

✅ How does React handle components, and what are the benefits of a component-based architecture?

✅ What are the differences between functional components and class components in React?

✅ How does state management work in React, and what are the different ways to manage state?

✅ What are props in React, and how are they used to pass data between components?

✅ How does React handle rendering and updating the DOM efficiently?

✅ What is the Virtual DOM, and how does React utilize it for performance optimization?

✅ How does event handling differ in React compared to traditional HTML/JS?

✅ What are controlled components in React, and why are they important?

✅ Explain the lifecycle methods in class components and how they correspond to functional components with hooks.

✅ What are React hooks, and how do they change the way we write components?

✅ Explain the useEffect hook and its purpose in managing side effects in React.

✅ What is the difference between useMemo and useCallback hooks?

✅ How does conditional rendering work in React, and what are some common ways to conditionally render components?

✅ What is the role of keys in React lists, and why are they important?

✅ How does React Router work, and what problem does it solve in React applications?

✅ What are higher-order components (HOCs) in React, and how are they used?

✅ What is context in React, and when is it appropriate to use it?

✅ How can you optimize performance in React applications?

✅ What are error boundaries in React, and how can they help handle errors in components?

✅ What is the purpose of refs in React, and in what scenarios are they useful?

✅ How does server-side rendering (SSR) differ from client-side rendering in React?

✅ What is the significance of the 'key' attribute when rendering a list of components?

✅ How can you prevent unnecessary re-renders in React components?

✅ Explain the concept of lifting state up in React.

✅ What are the best practices for organizing and structuring React applications?

✅ How does React differ from React Native, and what are their respective use cases?

✅ Can you explain the reconciliation process in React?

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