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 React?

335

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

434

What are the pros and cons of using React?

355

What is JSX?

322

What is React.createClass?

335

What is React.createElement?

370

What is ReactDOM and what is the difference between ReactDOM and React?

426

What is the difference between a Presentational component and a Container component?

361

What are the differences between a class component and functional component?

357

What is the difference between state and props?

367

Name the different React lifecycle methods.

389

Where in a React component should you make an AJAX request?

462

What are controlled components?

319

What are refs used for in React?

343

What is a higher order component?

346

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Un-Answered Questions { React.js }

How can you update state in react js?

423

What is the purpose of render method of react-dom?

359

What is arrow function in react?

389

What is “forward refs”?

331

What is ReactDOM and what is the difference between ReactDOM and React?

426

What are the methods called when component is created or while inserting it to dom?

316

What is the use of react-dom package?

372

What is REFS in React

316

How reactjs framework is different as compared to others?

346

Explain dom diffing?

337

Differentiate between real dom and virtual dom?

294

What is the difference between react components extend, createclass and mixins, hocs?

314

What is a state in react and how is it used?

367

What is the role of reducer.

352

What are arrow functions?

323

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