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?

476

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?

409

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?

368

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 }

Why you can’t update props in react?

405

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

425

What is a state in reactjs and how is it used?

397

How Virtual-DOM is more efficient than Dirty checking?

431

What is arrow function in react? How is it used?

417

How are actions defined in redux?

444

What are class based component?

367

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

369

Explain the use of ‘key’ in react list

418

Can you update props in react?

429

What are controlled and uncontrolled components in React?

366

Differentiate between real dom and virtual dom?

339

What is higher order components (hoc)?

378

What is the component lifecycle in reactjs?

440

How do you this in constructor?

383

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