React.js Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

React.js Interview Questions

Questions Answers Views Company eMail

What is the ‘Store’ feature in Redux?

327

How to dispatch the data in-store?

388

What is the use of React.Children.map(props.children, () => )?

356

List down some of the methods in a react-dom package

341

What are the popular animation package in React ecosystem?

384

How can we do server-side rendering in React?

382

Can you update props in react?

395

What is Babel in React js?

362

What is the purpose of callback function as an argument of setstate()?

399

How to build the React app for production?

393

What is ComponentWillMount()?

492

Explain react hooks?

317

What is the difference between shadow dom and virtual dom?

425

Explain error boundaries?

357

List some of the major advantages of react?

373

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Un-Answered Questions { React.js }

What is meant by callback function? What is its purpose?

355

What is lazy loading react?

375

What is the purpose of render method of react-dom?

366

What is PureComponent? When to use PureComponent over Component?

416

How do you tell react to build in production mode and what will that do?

393

Why is switch keyword used in react router v4?

334

What is react fiber?

364

What do you know about controlled and uncontrolled components?

327

What is the difference between dom and virtual dom in reactjs?

466

What are keys in reactjs and why are they important?

386

What is the component lifecycle in reactjs?

392

What is component in reactjs?

433

Explain the role of reducer?

368

Explain the meaning of Mounting and Demounting

322

How state is useful for react?

360

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