React.js Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

React.js Interview Questions

Questions Answers Views Company eMail

How do you pass data from child to parent component?

366

How do you this in constructor?

349

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

319

What's the difference between super() and super(props) in React when using ES6 classes?

457

What is Children?

313

How is react different?

374

Why reactjs is used?

336

What are the features of react?

352

How reactjs framework is different as compared to others?

346

How is react different from angular?

371

What is the lifecycle methods order in mounting?

330

What are higher order components(hoc)?

390

What are the advantages of redux?

358

How to update a component every second?

400

What do you understand with the term polling?

361

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Un-Answered Questions { React.js }

What is the main goal of react fiber?

314

What is the purpose of push() and replace() methods of history?

384

What are the differences between controlled and uncontrolled components?

324

What is the significance of refs in react?

332

What do you understand by mixin or higher order components in reactjs?

299

What is the purpose of render() in react?

376

What is the difference between reactjs and angularjs?

343

How is react.js different from other javascript frameworks?

387

What is refs?

448

What a setState is doing?

427

What is the reduction?

291

Explain flux?

397

What is the use of a super keyword in React?

324

Explain React Router

347

How can you update the state of a component?

331

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