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 forceUpdate()?

448

What are the lifecycle steps of React?

477

What is render() in React? And explain its purpose?

493

What is Redux?

418

How do you do type check in ReactJS?

482

Explain the Presentational segment

515

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

465

Why do we need a router in react?

445

What is SyntheticEvent?

413

What is the difference between npm & npx?

511

Explain the term high order component

425

Explain synthetic event in React js?

435

Explain the components of Redux?

451

What is PureComponent? When to use PureComponent over Component?

488

Is it possible to nest jsx elements into other jsx elements?

425

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Un-Answered Questions { React.js }

What's the difference between super() and super(props) in React when using ES6 classes?

528

Define the term Redux in React

438

Explain dom diffing?

415

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

429

What is the difference between react components in es5 and es6?

433

What is the recommended way for naming components?

422

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

434

What is component in reactjs?

529

What are the advantages of using reactjs?

503

How do you this in constructor?

419

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

464

Show how the data flows through redux?

402

What is React.createClass?

415

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

483

What is lazy loading react?

444

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