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?

515

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?

441

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

412

What are pure functional components?

423

What is the difference between angularjs vs react.js?

522

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

485

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

515

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

413

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

425

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

444

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

433

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

418

Explain about the standard javascript toolchain, transpilation, jsx?

416

What is the significance of refs in react?

422

What is flux in react.js?

493

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Un-Answered Questions { React.js }

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

425

What is react router?

437

What is the use of react-dom package?

452

Is reactjs a framework?

428

What are the lifecycle methods going to be deprecated in react v16?

423

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

663

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

412

How events are different in react?

472

What is lazy loading react?

444

What is ‘create-react-app’?

421

Ho can you re-render a component without using setState() function?

461

What are synthetic events?

407

What are fragments?

495

What are synthetic events in react?

454

How can you spill the reducers?

907

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