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?

385

What is the use of a super keyword in React?

368

State the main difference between Pros and State?

471

How Virtual-DOM is more efficient than Dirty checking?

431

Explain the use of the arrow function in React

404

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

379

What are controlled and uncontrolled components in React?

366

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

409

Explain yield catchphrase in JavaScript

391

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

520

What kind of information controls a segment in React?

678

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

466

How can you update state in react js?

461

Explain pure components in React js?

377

What is one of the core types in react?

404

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Un-Answered Questions { React.js }

What is the difference between an element and a component in react?

437

What is low-level component lifecycle in react.js?

437

Explain dom diffing?

384

What is the use of arrow function in reactjs?

402

What is high-level component lifecycle in react.js?

476

What are the pros and cons of using React?

385

How to use forms in reactjs?

410

Why is switch keyword used in react router v4?

368

What are children prop?

364

What are the methods called when state or props of the component is changed?

390

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

392

What is the life cycle of reactjs components?

374

How to use https instead of http in create-react-app?

448

What is the difference between React Native and React?

446

Explain the term synthetic events?

538

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