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 can you do with hoc?

243

What is the use of a super keyword in React?

251

State the main difference between Pros and State?

292

How Virtual-DOM is more efficient than Dirty checking?

313

Explain the use of the arrow function in React

264

What is meant by callback function? What is its purpose?

271

What are controlled and uncontrolled components in React?

239

Is setState() is async? Why is setState() in React Async instead of Sync?

262

Explain yield catchphrase in JavaScript

282

What is an Action? How do you describe an Action?

283

What kind of information controls a segment in React?

400

What is the difference between using constructor vs getInitialState in React?

284

How can you update state in react js?

309

Explain pure components in React js?

252

What is one of the core types in react?

242

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Un-Answered Questions { React.js }

Explain the purpose of render() in react.

244

What are the popular animation package in React ecosystem?

300

How do you create an event in react?

244

State the difference between Real DOM and Virtual DOM?

242

Is reactjs a framework?

251

What is component in reactjs?

278

What is ComponentWillMount()?

398

What is Reactjs?

245

What are the popular packages for animation?

290

What do you understand by virtual dom?

250

What is the differnece between real dom and virtual dom?

248

What is the difference between the state and props in reactjs?

237

Explain the term ‘Restructuring.’

232

What is the difference between React Native and React?

257

Explain what is CSS-in-JS pattern?

264

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