React interview questions

React Questions - I

• What is a lifecycle method in React?
• How will you convert a class-based to a function-based component in react?
• How do you manage state in Component?
• Redux middleware? Topic - Saga and Thunk.
• Why do we need middleware in redux implementation?
• Why do we need typescript instead of javascript?
• Explain the use case with typescript?
• Do you know server-side rendering in react?
• How to style a component in react?
• Have you used any library in react? Explain in detail.
• In Material UI what does the makeStyle function do?
• Can we use multiple className in the same object for Material UI?
• What is your testing strategy?
• The app should have bi-lingual support - English & Hindi - so what will be your approach in react?
• Have you worked in CMS (Connect Management System)?
• How do you manage projects and any tool that you have used for the same?
• Are you following any agile method in the project? Explain if yes.
• Do you have any experience in DevOps?

React Questions - II

• What are the Hooks you have used?
• What is the purpose of useCallback?
• How would you be able to achieve componentDidMount, componentDidUpdate & componentDidUnMount in functional based component?
• What are Pure Components and list their purpose?
• What are Higher Order components?
• What HOCs have you used?
• Have you used Context API?
• Already have state management in React, so why go for Redux?
• How does Redux works?

React Questions - III

• What is Virtual DOM and how it works?
• What is the JavaScript Engine used in Chrome?
• Why do different browsers have different engines?
• Why do we use useState, why can't directly we set the state?
• How to set default values to the props?

REDUX

• What are mapStateToProps and mapDispatchToProps?
• Where do you define the reducers?
• Are you using reducers, how to use multiple reducers?
• Multiple reducers, how your component will identify which reducer gets called?
• Explain FLUX Architecture?
• Difference between FLUX & REDUX