star iconstar iconstar iconstar iconstar icon

"Huge timesaver. Worth the money"

star iconstar iconstar iconstar iconstar icon

"It's an excellent tool"

star iconstar iconstar iconstar iconstar icon

"Fantastic catalogue of questions"

Ace your next tech interview with confidence

Explore our carefully curated catalog of interview essentials covering full-stack, data structures and algorithms, system design, data science, and machine learning interview questions

Redux

100 Redux interview questions

Only coding challenges
Topic progress: 0%

Redux Fundamentals


  • 1.

    What is Redux and how is it used in web development?

    Answer:
  • 2.

    Can you describe the three principles that Redux is based upon?

    Answer:
  • 3.

    What is an action in Redux?

    Answer:
  • 4.

    How are actions used to change the state in a Redux application?

    Answer:
  • 5.

    What is a reducer in Redux and what role does it play?

    Answer:
  • 6.

    How does Redux differ from local component state in React?

    Answer:
  • 7.

    Define “store” in the context of Redux.

    Answer:
  • 8.

    Can you describe the concept of “single source of truth” in Redux?

    Answer:
  • 9.

    How do you create a Redux store?

    Answer:
  • 10.

    What is meant by “immutable state,” and why is it important in Redux?

    Answer:
  • 11.

    Explain the significance of the combineReducers function.

    Answer:
  • 12.

    What are pure functions and side effects in the context of Redux?

    Answer:

Redux Core Concepts


  • 13.

    How do you handle asynchronous actions in Redux?

    Answer:
  • 14.

    What is a “selector” in Redux and what is its purpose?

    Answer:
  • 15.

    How does Redux handle the flow of data and actions?

    Answer:
  • 16.

    Can you explain the difference between a Container and Presentational component in Redux?

    Lock icon indicating premium question
    Answer:
  • 17.

    What is middleware in Redux and when would you use it?

    Lock icon indicating premium question
    Answer:
  • 18.

    How do you access the Redux store in a React component?

    Lock icon indicating premium question
    Answer:
  • 19.

    What is the purpose of the dispatch function in Redux?

    Lock icon indicating premium question
    Answer:
  • 20.

    What arguments does createStore receive in Redux?

    Lock icon indicating premium question
    Answer:
  • 21.

    Describe the subscribe function in Redux.

    Lock icon indicating premium question
    Answer:

Working with Redux Actions


  • 22.

    How do you structure action creators in Redux?

    Lock icon indicating premium question
    Answer:
  • 23.

    What is an action type and how is it used in Redux?

    Lock icon indicating premium question
    Answer:
  • 24.

    Can you give an example of a synchronous action creator?

    Lock icon indicating premium question
    Answer:
  • 25.

    How do you handle complex state logic in actions?

    Lock icon indicating premium question
    Answer:
  • 26.

    Explain the concept of action creators returning a function for asynchronous operations.

    Lock icon indicating premium question
    Answer:

Reducers and State Management


  • 27.

    How do reducers handle state changes in response to different action types?

    Lock icon indicating premium question
    Answer:
  • 28.

    What is meant by a “slice reducer”?

    Lock icon indicating premium question
    Answer:
  • 29.

    Describe how to properly update the state based on an action.

    Lock icon indicating premium question
    Answer:
  • 30.

    How would you reset the state of a Redux store?

    Lock icon indicating premium question
    Answer:
  • 31.

    Can you discuss reducer composition and its benefits?

    Lock icon indicating premium question
    Answer:
  • 32.

    What is the significance of immutability in reducer functions?

    Lock icon indicating premium question
    Answer:
  • 33.

    How do you handle initial state in Redux reducers?

    Lock icon indicating premium question
    Answer:
  • 34.

    What are common pitfalls when writing reducers?

    Lock icon indicating premium question
    Answer:

Redux Middleware and Side Effects


  • 35.

    What is redux-thunk and how does it work?

    Lock icon indicating premium question
    Answer:
  • 36.

    Can you explain the purpose of redux-saga and how it compares to redux-thunk?

    Lock icon indicating premium question
    Answer:
  • 37.

    What is a “side effect” and how do middlewares handle them in Redux?

    Lock icon indicating premium question
    Answer:
  • 38.

    How do you write a custom middleware for Redux?

    Lock icon indicating premium question
    Answer:
  • 39.

    Discuss how middlewares can enhance the capabilities of a Redux store.

    Lock icon indicating premium question
    Answer:

Redux and UI Integration


  • 40.

    How do you connect a React component to a Redux store?

    Lock icon indicating premium question
    Answer:
  • 41.

    What are the advantages of using React-Redux’s connect function?

    Lock icon indicating premium question
    Answer:
  • 42.

    Can you describe the mapStateToProps and mapDispatchToProps functions?

    Lock icon indicating premium question
    Answer:
  • 43.

    Explain the Provider component from React-Redux.

    Lock icon indicating premium question
    Answer:
  • 44.

    How do you use hooks like useDispatch and useSelector in React functional components?

    Lock icon indicating premium question
    Answer:
  • 45.

    What performance considerations should be taken into account when connecting components to Redux?

    Lock icon indicating premium question
    Answer:
  • 46.

    How can you optimize the performance of Redux-connected components?

    Lock icon indicating premium question
    Answer:

Advanced Redux Patterns


  • 47.

    What are Higher Order Reducers (HORs) and how are they used?

    Lock icon indicating premium question
    Answer:
  • 48.

    Can you implement a feature toggle mechanism using Redux?

    Lock icon indicating premium question
    Answer:
  • 49.

    How do you normalize a state shape in Redux?

    Lock icon indicating premium question
    Answer:
  • 50.

    What is a Redux “slice” and how is it used?

    Lock icon indicating premium question
    Answer:
  • 51.

    Explain the “Ducks” pattern in Redux.

    Lock icon indicating premium question
    Answer:

Redux State Normalization


  • 52.

    Why is state normalization recommended in Redux?

    Lock icon indicating premium question
    Answer:
  • 53.

    How do you structure a normalized state?

    Lock icon indicating premium question
    Answer:
  • 54.

    What are the benefits of state denormalization?

    Lock icon indicating premium question
    Answer:
  • 55.

    Can you explain how to manage entity relations in a normalized Redux state?

    Lock icon indicating premium question
    Answer:

Redux Ecosystem and Utilities


  • 56.

    What is Immutable.js and how can it be used with Redux?

    Lock icon indicating premium question
    Answer:
  • 57.

    Discuss the Redux DevTools extension and its features.

    Lock icon indicating premium question
    Answer:
  • 58.

    How do reselect and memoized selectors work in Redux?

    Lock icon indicating premium question
    Answer:
  • 59.

    What are common utilities and libraries used in conjunction with Redux?

    Lock icon indicating premium question
    Answer:
  • 60.

    Describe the significance of the Redux Toolkit and how it helps Redux development.

    Lock icon indicating premium question
    Answer:

Testing Redux Applications


  • 61.

    How do you test Redux reducers?

    Lock icon indicating premium question
    Answer:
  • 62.

    What is the recommended approach to test Redux actions?

    Lock icon indicating premium question
    Answer:
  • 63.

    How can you test a Redux-connected React component?

    Lock icon indicating premium question
    Answer:
  • 64.

    Describe the process of testing asynchronous action creators.

    Lock icon indicating premium question
    Answer:
  • 65.

    What tools can you use to facilitate testing in Redux applications?

    Lock icon indicating premium question
    Answer:

Redux with Other Frameworks and Libraries


  • 66.

    How do you integrate Redux with a framework other than React, like Angular or Vue?

    Lock icon indicating premium question
    Answer:
  • 67.

    Can Redux be used with server-side rendering frameworks like Next.js?

    Lock icon indicating premium question
    Answer:
  • 68.

    Discuss the use of Redux with React Native.

    Lock icon indicating premium question
    Answer:
  • 69.

    What adaptations are needed to use Redux outside of a UI environment (e.g., in a Node.js backend)?

    Lock icon indicating premium question
    Answer:

Scaling Redux for Large Applications


  • 70.

    How do you organize your files and folders in a large Redux application?

    Lock icon indicating premium question
    Answer:
  • 71.

    What strategies can be used to scale Redux actions and reducers?

    Lock icon indicating premium question
    Answer:
  • 72.

    Can you explain the concept of “domain-driven design” in the context of a Redux state tree?

    Lock icon indicating premium question
    Answer:
  • 73.

    How do feature modules and code splitting affect Redux state management?

    Lock icon indicating premium question
    Answer:
  • 74.

    Discuss strategies for managing complex application state with Redux.

    Lock icon indicating premium question
    Answer:

Redux Performance Optimization


  • 75.

    How do you prevent unnecessary renders in Redux-connected components?

    Lock icon indicating premium question
    Answer:
  • 76.

    What techniques are available to reduce the size of the Redux store?

    Lock icon indicating premium question
    Answer:
  • 77.

    How do you optimize Redux action dispatch and payload size?

    Lock icon indicating premium question
    Answer:
  • 78.

    What are best practices for ensuring a scalable Redux state management with large datasets or frequent updates?

    Lock icon indicating premium question
    Answer:

Redux and Forms


  • 79.

    How do you manage form state with Redux?

    Lock icon indicating premium question
    Answer:
  • 80.

    Discuss the use of libraries like Redux Form or React Final Form with Redux.

    Lock icon indicating premium question
    Answer:
  • 81.

    What are the trade-offs of keeping form state in the Redux store?

    Lock icon indicating premium question
    Answer:

Redux and Authentication


  • 82.

    How do you manage user authentication and session state in Redux?

    Lock icon indicating premium question
    Answer:
  • 83.

    What considerations should be made for security when storing tokens or sensitive information in Redux?

    Lock icon indicating premium question
    Answer:
  • 84.

    How do you manage login and logout workflows with Redux actions and reducers?

    Lock icon indicating premium question
    Answer:

Migrating to Redux and State Hydration


  • 85.

    How do you approach migrating a legacy application state management to Redux?

    Lock icon indicating premium question
    Answer:
  • 86.

    Can you explain the concept of “state hydration” in the context of SSR and Redux?

    Lock icon indicating premium question
    Answer:
  • 87.

    What challenges might arise when integrating Redux into an existing application and how would you address them?

    Lock icon indicating premium question
    Answer:

Redux Future and Community


  • 88.

    Describe the current trends and community practices around Redux.

    Lock icon indicating premium question
    Answer:
  • 89.

    How has Redux evolved to fit into the modern React ecosystem with hooks?

    Lock icon indicating premium question
    Answer:
  • 90.

    What do you believe is the future of Redux given the context of emerging state management libraries?

    Lock icon indicating premium question
    Answer:

Advanced State Modeling in Redux


  • 91.

    How do you model complex state dependencies and computations in Redux?

    Lock icon indicating premium question
    Answer:
  • 92.

    Discuss your approach to type checking and ensuring state consistency.

    Lock icon indicating premium question
    Answer:
  • 93.

    How do you tackle transactional updates in Redux?

    Lock icon indicating premium question
    Answer:
  • 94.

    What strategies would you use for undo/redo functionality in a Redux application?

    Lock icon indicating premium question
    Answer:

Redux Interoperability


  • 95.

    How does Redux interact with WebSockets or external data sources?

    Lock icon indicating premium question
    Answer:
  • 96.

    Discuss the integration of GraphQL in a Redux-managed application.

    Lock icon indicating premium question
    Answer:
  • 97.

    How would you manage local vs. server state in a Redux application?

    Lock icon indicating premium question
    Answer:

Redux API Requests and Caching


  • 98.

    How do you structure API requests in Redux actions?

    Lock icon indicating premium question
    Answer:
  • 99.

    Discuss methods for caching API responses in the Redux store.

    Lock icon indicating premium question
    Answer:
  • 100.

    What patterns or libraries do you use to manage RESTful or GraphQL API interactions with Redux?

    Lock icon indicating premium question
    Answer:
folder icon

Unlock interview insights

Get the inside track on what to expect in your next interview. Access a collection of high quality technical interview questions with detailed answers to help you prepare for your next coding interview.

graph icon

Track progress

Simple interface helps to track your learning progress. Easily navigate through the wide range of questions and focus on key topics you need for your interview success.

clock icon

Save time

Save countless hours searching for information on hundreds of low-quality sites designed to drive traffic and make money from advertising.

Land a six-figure job at one of the top tech companies

amazon logometa logogoogle logomicrosoft logoopenai logo
Ready to nail your next interview?

Stand out and get your dream job

scroll up button

Go up