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

React.js Interview Questions

Questions Answers Views Company eMail

Explain what is CSS-in-JS pattern?

361

What is the difference between super() and super(props)?

413

Is it possible in React to call the Child method from Parent?

361

Can a developer create animations in React?

386

How can I make an AJAX call?

408

What is React.PropTypes?

414

Name two types of React component?

392

What are Props in react js?

385

What a setState is doing?

441

What is the difference between a function in setState or passing an object?

341

Can you force a React component to rerender without calling setState?

349

What is Redux Thunk used for?

369

Difference between constructor and getInitialState ?

370

Do you need to use ES6 (+) with React?

388

What is React State?

425

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Un-Answered Questions { React.js }

What are refs in reactjs?

331

When reactjs released?

355

How to use https instead of http in create-react-app?

404

Explain the meaning of Mounting and Demounting

322

What is the difference between state and props?

374

What are portals in react?

445

What is an action in Redux?

333

How to enable production mode in react?

431

In which lifecycle event do you make ajax requests and why?

359

How to add google analytics for react router?

379

What are the popular animation package in React ecosystem?

384

Explain the significance of keys in react?

334

Explain yield catchphrase in JavaScript

364

What is reactjs-jsx? What are the advantages of using jsx? Explain basic code snippet of jsx with the help of a practical example?

327

Why do you need to use props.children?

322

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