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 high-level component lifecycle in react.js?

482

What are state and props in reactjs? What is the difference between the two? Give a proper example of using state and props to elaborate the concept with complete source code?

415

What is the difference between setstate() and forceupdate()?

381

What are pure functional components?

403

What is the difference between angularjs vs react.js?

497

What is the difference between an element and a component in react?

441

How to use events in reactjs? Give an example of using events?

479

Can you explain about the standard javascript toolchain, transpilation, jsx?

374

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

387

What is reactjs-jsx? What are the advantages of using jsx?

405

What is the difference between react components in es5 and es6?

399

How would you create higher order components (hocs) in react.js?

367

Explain about the standard javascript toolchain, transpilation, jsx?

382

What is the significance of refs in react?

374

What is flux in react.js?

459

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Un-Answered Questions { React.js }

What is the difference between using constructor vs getInitialState in React?

472

Explain basic code snippet of jsx with the help of a practical example?

379

What are the pros and cons of using React?

385

What is the use of a super keyword in React?

372

When would you use setstate() and forceupdate()?

332

In what cases would you use a class component over a functional component?

343

Explain strict mode

395

How to build the React app for production?

424

What is arrow function in react?

439

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

379

Explain React Router

397

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

394

What are refs used for in React?

379

Why do you need to use props.children?

361

Can you force a React component to rerender without calling setState?

396

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