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

React.js Interview Questions

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How react component lifecycle methods help in building interfaces?

404

What is shouldcomponentupdate and when is used in react.js?

371

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

401

Explain step by step approach on how to setup environment for reactjs?

321

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

What is the difference between react components extend, createclass and mixins, hocs?

321

Which feature can we use to cause a component to render only when its id changes?

485

What is redux and flux?

349

What is the virtual dom, and a pragmatic overview of how react renders it to the dom in react.js?

323

Explain lifecycle of a react component?

376

What is reactjs-jsx? Explain basic code snippet of jsx with the help of a practical example?

363

How to set up routing in reactjs. Explain with the help of step by step approach?

302

What is a router in react.js?

351

Please explain step by step approach on how to setup environment for reactjs?

332

What are state and props in reactjs? What is the difference between the two?

380

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Un-Answered Questions { React.js }

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

350

What is forceUpdate()?

370

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

443

How to update a component every second?

406

What is the difference between React Component and React Element?

418

How to use events in reactjs? Give an example of using events?

431

What are lifecycle hooks react?

416

What is flux concept in reactjs? Explain various flux elements including action, dispatcher, store and view. Give a simple practical example of installing and using flux in an application?

351

What are the differences in between real dom and virtual dom?

440

What is the purpose of push() and replace() methods of history?

391

What are the popular animation package in React ecosystem?

384

Why should I use react js?

330

Name out an important feature of Redux workflow features

368

What are controlled components?

327

How to apply validation on props in reactjs? Apply validation in previously developed example in above question?

351

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