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?

455

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?

419

What is PureComponent? When to use PureComponent over Component?

450

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

380

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Un-Answered Questions { React.js }

What is Flux Concept In React?

407

What are the life cycle of reactjs?

383

How can you update the state of a component?

360

What is the recommended way for naming components?

384

What do you know about controlled and uncontrolled components?

352

What is the ‘Store’ feature in Redux?

354

What kind of tools might you use in the build steps to optimize the compiled output of the react code?

526

Explain synthetic event in React js?

401

What is PureComponent? When to use PureComponent over Component?

450

How to set state with a dynamic key name?

423

What are refs in reactjs?

364

Why should I use react js?

350

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

384

What are the different phases of react component’s lifecycle?

565

What is inline conditional expressions?

459

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