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?

477

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?

413

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

377

What are pure functional components?

398

What is the difference between angularjs vs react.js?

496

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

437

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?

382

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?

376

What is the significance of refs in react?

372

What is flux in react.js?

459

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Un-Answered Questions { React.js }

How state is useful for react?

399

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

394

When rendering a list what is a key and what is it's purpose?

362

Explain the features of react?

372

does reactjs use html?

365

What is reactjs-jsx? Explain basic code snippet of jsx with the help of a practical example?

396

How do you modularize code in react?

398

What are the benefits of using react.js?

456

List some features of reactjs?

352

How can we build react in production mode?

360

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

427

what is the usage of refs and keys used in react?

445

How can you update state in react js?

461

What is a higher order component?

380

Please explain step by step approach on how to setup environment for reactjs?

371

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