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?

464

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?

392

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?

400

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

395

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

345

What is a router in react.js?

387

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

369

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 is the second argument that can optionally be passed to setState and what is its purpose?

512

When rendering a list what is a key and what is it's purpose?

362

Explain the role of reducer?

411

What is the difference between setstate() and forceupdate()?

377

Define the term Redux in React

408

What is the reduction?

330

What are the purpose of render() in react?

384

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

466

What is SyntheticEvent?

378

Why should I use react js?

350

Why are browsers unable to read jsx?

411

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

382

Can you force a React component to rerender without calling setState?

393

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

414

What is the use of react-dom package?

415

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