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

React.js Interview Questions

Questions Answers Views Company eMail

How react component lifecycle methods help in building interfaces?

466

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

408

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

437

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

356

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?

382

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

363

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

546

What is redux and flux?

394

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

372

Explain lifecycle of a react component?

401

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

396

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

345

What is a router in react.js?

388

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

371

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

431

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Un-Answered Questions { React.js }

What are state and props in reactjs? What is the difference between the two? Give a proper example of using state and props to elaborate the concept with complete source code?

410

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

382

What kind of information controls a segment in React?

678

What are arrow functions?

365

What is the difference between function based component and class based component?

435

What is jest?

433

Explain the Presentational segment

480

What is the recommended way for naming components?

384

Why react js is faster?

381

How do you tell react to build in production mode and what will that do?

427

When was React first released?

407

What is a higher order component?

380

Why is react better?

353

How are forms created in react?

402

What do you understand by refs in react?

361

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