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?

351

What is the use of a super keyword in React?

329

State the main difference between Pros and State?

436

How Virtual-DOM is more efficient than Dirty checking?

401

Explain the use of the arrow function in React

372

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

355

What are controlled and uncontrolled components in React?

321

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

370

Explain yield catchphrase in JavaScript

364

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

490

What kind of information controls a segment in React?

637

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

428

How can you update state in react js?

432

Explain pure components in React js?

344

What is one of the core types in react?

367

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Un-Answered Questions { React.js }

What do you understand by virtual dom? Explain its working.

304

What is the significance of store in redux?

351

What is the use of React.Children.map(props.children, () => )?

356

How is react router different from conventional routing?

515

Name two types of React component?

392

What are stateless components in reactjs?

350

How react component lifecycle methods help in building interfaces?

405

What are the components of redux.

336

How can a browser read JSX file?

344

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

472

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

490

What are pure components?

309

List some of the cases when you should use refs?

304

What is React State?

425

How is react different?

381

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