React.js Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

React.js Interview Questions

Questions Answers Views Company eMail

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

350

What is props?

339

What are the popular libraries used for flux?

478

Do you think reactjs has any limitations? If so, tell a few?

362

What is a state in reactjs and how is it used?

363

What are the differences between controlled and uncontrolled components?

335

What are the lifecycle methods of reactjs components?

340

What are keys in reactjs and why are they important?

386

What are the component life cycle methods in reactjs?

404

What is the life cycle of reactjs components?

350

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

347

What is controllable component in reactjs?

366

What is component in reactjs?

433

What do you mean by reactjs?

354

What are the difference between pros and state?

411

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Un-Answered Questions { React.js }

What are the differentiate between stateful and stateless components?

399

What is React.createElement?

380

In what cases would you use a class component over a functional component?

311

What is a state in react?

364

Explain the major advantages of react.

339

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

388

Show how the data flows through redux?

332

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

359

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

350

How react router and its techniques differ from more traditional javascript routers like backbone’s router?

518

What is redux and flux? When do you use them?

377

What are the feature of reactjs?

518

What is react.js? How is it different from other javascript frameworks?

401

What is REFS in React

323

Explain the role of reducer?

368

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