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()?

370

What are the lifecycle steps of React?

398

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

434

What is Redux?

344

How do you do type check in ReactJS?

418

Explain the Presentational segment

436

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

399

Why do we need a router in react?

384

What is SyntheticEvent?

343

What is the difference between npm & npx?

432

Explain the term high order component

332

Explain synthetic event in React js?

360

Explain the components of Redux?

382

What is PureComponent? When to use PureComponent over Component?

416

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

341

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Un-Answered Questions { React.js }

Why do we need a router in reactjs?

341

How React works? How Virtual-DOM works in React?

443

How are forms created in react?

359

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

434

How do you embed two components in one component?

298

What are the differences in between real dom and virtual dom?

440

Is it possible to use async/await in plain react?

349

Define the term Redux in React

372

What is the purpose of render() in react?

388

What is React State?

425

How can you embed two or more components into one?

329

When should you use the top-class elements for the function element?

353

What do you understand by refs in react?

333

How to use events in reactjs?

343

What are the differences between controlled and uncontrolled components?

335

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