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()?

365

What are the lifecycle steps of React?

388

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

422

What is Redux?

335

How do you do type check in ReactJS?

415

Explain the Presentational segment

423

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

390

Why do we need a router in react?

375

What is SyntheticEvent?

336

What is the difference between npm & npx?

425

Explain the term high order component

324

Explain synthetic event in React js?

357

Explain the components of Redux?

373

What is PureComponent? When to use PureComponent over Component?

409

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

336

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Un-Answered Questions { React.js }

What is the difference between shadow dom and virtual dom?

416

What is a router in react.js?

348

Can you update the values of props?

348

What is inline conditional expressions?

415

What are fragments?

426

What is the life cycle of reactjs components?

339

What is the purpose of render() in react?

376

How will be you able to handle more action using redux?

346

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

344

What is shouldcomponentupdate and when is used in react.js?

366

Explain error boundaries?

348

Explain the purpose of render() in react.

342

What are the component life cycle methods in reactjs?

397

How do you do type check in ReactJS?

415

Why reactjs is used?

336

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