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 forceUpdate()?

415

What are the lifecycle steps of React?

445

What is render() in React? And explain its purpose?

457

What is Redux?

373

How do you do type check in ReactJS?

448

Explain the Presentational segment

480

Does React re-render all components and sub components every time setState is called?

430

Why do we need a router in react?

412

What is SyntheticEvent?

378

What is the difference between npm & npx?

475

Explain the term high order component

379

Explain synthetic event in React js?

401

Explain the components of Redux?

422

What is PureComponent? When to use PureComponent over Component?

452

Is it possible to nest jsx elements into other jsx elements?

380

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Un-Answered Questions { React.js }

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

479

What are the popular animation package in React ecosystem?

418

How is reactjs different from angular and vue js?

460

What is an action in Redux?

380

What is the difference between stateless and stateful component?

430

What is redux and flux?

394

Explain strict mode

384

Explain various flux elements including action, dispatcher, store and view. Give a simple practical example of installing and using flux in an application?

357

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

610

How different is react’s es6 syntax when compared to es5?

444

What are the advantages and disadvantages of using react components?

463

What are higher order components(hoc)?

434

Why is react better?

353

What are lifecycle hooks react?

451

How can you update the state of a component?

360

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