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

React.js Interview Questions

Questions Answers Views Company eMail

When would you use a class component over a functional component?

391

What is props?

383

What are the popular libraries used for flux?

510

Do you think reactjs has any limitations? If so, tell a few?

415

What is a state in reactjs and how is it used?

397

What are the differences between controlled and uncontrolled components?

366

What are the lifecycle methods of reactjs components?

371

What are keys in reactjs and why are they important?

428

What are the component life cycle methods in reactjs?

455

What is the life cycle of reactjs components?

374

What are the methods called when state or props of the component is changed?

390

What is controllable component in reactjs?

399

What is component in reactjs?

482

What do you mean by reactjs?

395

What are the difference between pros and state?

454

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Un-Answered Questions { React.js }

Explain strict mode

380

Explain flux?

449

How can we find the version of react at runtime in the browser?

610

Explain the term synthetic events?

538

How to set focus in reactjs?

377

What is the virtual dom, and a pragmatic overview of how react renders it to the dom in react.js?

372

Why react js is faster?

380

Explain the significance of store in redux?

402

In which lifecycle event do you make ajax requests and why?

394

What are the components in flux architecture?

399

How to apply validation on props in reactjs? Apply validation in previously developed example in above question?

382

What are keys in reactjs and why are they important?

428

Explain the Presentational segment

480

What are stateless components in reactjs?

387

Explain react hooks?

371

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