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?

382

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

479

What are the pros and cons of using React?

385

What is JSX?

356

What is React.createClass?

381

What is React.createElement?

416

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

468

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

415

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

407

What is the difference between state and props?

405

Name the different React lifecycle methods.

444

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

501

What are controlled components?

362

What are refs used for in React?

377

What is a higher order component?

380

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Un-Answered Questions { React.js }

When would you use a class component over a functional component?

391

What is controllable component in reactjs?

399

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

357

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

479

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

396

Explain the difference between functional and class components.

370

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

409

How to use events in reactjs? Give an example of using events?

479

How can you spill the reducers?

860

Name two types of React component?

427

What is Children?

356

How to set up routing in reactjs?

419

What do you understand with the term polling?

405

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

407

What is react fiber?

399

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