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?

420

What is the use of a super keyword in React?

415

State the main difference between Pros and State?

504

How Virtual-DOM is more efficient than Dirty checking?

472

Explain the use of the arrow function in React

452

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

410

What are controlled and uncontrolled components in React?

396

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

446

Explain yield catchphrase in JavaScript

430

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

555

What kind of information controls a segment in React?

713

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

502

How can you update state in react js?

496

Explain pure components in React js?

410

What is one of the core types in react?

442

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Un-Answered Questions { React.js }

What is the component lifecycle in reactjs?

482

What is the difference between real dom and virtual dom.

459

Why is react better?

393

How react component lifecycle methods help in building interfaces?

510

What are arrow functions?

399

How can I make an AJAX call?

482

What is ComponentWillMount()?

573

Explain life cycle of react js component?

382

How to use events in reactjs?

417

Why should I use react js?

385

Ho can you re-render a component without using setState() function?

461

How arrow functions are used?

394

Give me two most significant drawbacks of React?

409

What is the use of a super keyword in React?

415

State the main difference between Pros and State?

504

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