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 do you pass data from child to parent component?

460

How do you this in constructor?

418

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

408

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

527

What is Children?

393

How is react different?

445

Why reactjs is used?

408

What are the features of react?

424

How reactjs framework is different as compared to others?

412

How is react different from angular?

454

What is the lifecycle methods order in mounting?

401

What are higher order components(hoc)?

464

What are the advantages of redux?

450

How to update a component every second?

485

What do you understand with the term polling?

436

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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?

565

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

511

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

512

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

393

How can you embed two or more components into one?

402

Define the term Redux in React

437

What are the feature of reactjs?

602

What are react component lifecycle methods?

490

What is the significance of store in redux?

434

Is setState() is async? Why is setState() in React Async instead of Sync?

445

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

408

What is the difference between super() and super(props)?

490

What is the difference between React Component and React Element?

496

What is higher order components (hoc)?

411

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

410

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