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?

410

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

377

What are pure functional components?

398

What is the difference between angularjs vs react.js?

492

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?

372

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?

397

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 to add google analytics for react router?

416

What are fragments?

462

What is one of the core types in react?

404

How do you apply vendor prefixes to inline styles in react?

511

What are the controlled components and uncontrolled components in reactjs?

400

What is the significance of keys in react?

552

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

379

How react component lifecycle methods help in building interfaces?

465

What kind of tools might you use in the build steps to optimize the compiled output of the react code?

527

What do you understand from “in react, everything is a component.”

379

What are the differentiate between stateful and stateless components?

448

Explain the lifecycle methods of react components in detail?

420

What is flux concept in reactjs?

401

Can you update the values of props?

384

What is the use of ‘prop-types’ library?

452

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