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?

343

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

443

What are the pros and cons of using React?

358

What is JSX?

329

What is React.createClass?

347

What is React.createElement?

379

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

436

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

368

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

369

What is the difference between state and props?

374

Name the different React lifecycle methods.

398

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

471

What are controlled components?

327

What are refs used for in React?

348

What is a higher order component?

349

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Un-Answered Questions { React.js }

How different is react’s es6 syntax when compared to es5?

406

How state is useful for react?

360

What are the major issues of using MVC architecture in React?

462

Can you explain about the standard javascript toolchain, transpilation, jsx?

336

How might react handle or restrict props to certain types, or require certain props to exist?

367

Is it possible to use the word class in jsx?

296

What is the use of ‘prop-types’ library?

406

What is the main difference between createElement and cloneElment?

372

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

377

Which is best react or angular?

327

What are pure components?

309

Does React re-render all components and sub components every time setState is called?

399

Show how the data flows through redux?

332

How to use events in reactjs?

342

What are components in reactjs? Explain the component lifecycle with the help of a diagram explaining each component method in detail. Also, give an example of both stateless and stateful components with source code?

340

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