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 React?

375

How React works? How Virtual-DOM works in React?

471

What are the pros and cons of using React?

381

What is JSX?

352

What is React.createClass?

378

What is React.createElement?

405

What is ReactDOM and what is the difference between ReactDOM and React?

462

What is the difference between a Presentational component and a Container component?

408

What are the differences between a class component and functional component?

403

What is the difference between state and props?

401

Name the different React lifecycle methods.

435

Where in a React component should you make an AJAX request?

496

What are controlled components?

354

What are refs used for in React?

371

What is a higher order component?

373

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Un-Answered Questions { React.js }

How to embed two components in one component?

389

What is the difference between angularjs vs react.js?

484

What are refs in reactjs?

358

What are synthetic events?

355

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

434

What are the advantages of redux?

406

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

388

What is the difference between shadow dom and virtual dom?

470

What is React?

375

Does React use HTML?

456

State the difference between React JS and React Native

531

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

391

What are the component life cycle methods in reactjs?

444

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

376

What is the significance of keys in react?

543

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