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?

343

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

443

What are the pros and cons of using React?

358

What is JSX?

330

What is React.createClass?

347

What is React.createElement?

380

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

436

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

368

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

369

What is the difference between state and props?

374

Name the different React lifecycle methods.

398

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

472

What are controlled components?

327

What are refs used for in React?

348

What is a higher order component?

349

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Un-Answered Questions { React.js }

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

341

What are the differences between controlled and uncontrolled components?

335

What is React.cloneElement? And the difference with this.props.children?

357

Explain the components of Redux?

382

What are fragments?

429

What is the difference between react components in es5 and es6?

362

What is the difference between flux vs mvc?

400

When reactjs released?

355

What are state and props in reactjs? What is the difference between the two? Give a proper example of using state and props to elaborate the concept with complete source code?

368

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

359

Explain pure components in React js?

344

What is react fiber?

364

How to install react js on your local machine?

410

Explain the lifecycle methods of react components in detail?

377

Explain the purpose of render() in react.

351

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