React Redux Interview Questions PDF By ScholarHat

React Redux Interview Questions: Crack Your
Next Interview in 2025
Preparing for the React Redux interview? These 60 questions and answers will help you
understand key concepts like state management, actions, reducers, middleware, and best
React Redux Interview Questions are essential for developers preparing for frontend and full-
stack roles. React is a popular JavaScript library for building user interfaces, while Redux is a
state management library that helps manage application states eﬃciently. To ace a React
Redux interview, you should understand concepts like actions, reducers, stores, middleware,
hooks, and asynchronous data handling.
In this React tutorial, we provide a list of commonly asked React Redux Interview Questions
with detailed answers. Whether you're a beginner or an experienced developer, this guide will
help you conﬁdently prepare for your next interview.
React Redux Interview Questions and Answers

practices. They will also enhance your confidence
applications.
in explaining Redux in real-world
Ans: The core principles of Redux are:
Single source of truth: The state of the application is stored in one global object, known as
the Redux store. This ensures that you have a consistent view of the entire application
state, making debugging and state management easier.
State is read-only: You cannot directly change the state. Instead, you dispatch actions to
express the intention to change the state, ensuring that the state remains immutable and
predictable.
For freshers preparing for a React Redux interview, these top 20 questions will help you grasp
essential concepts like state management, actions, reducers, and the Redux workflow. They
will also boost your confidence in explaining Redux fundamentals effectively.
Ans: Redux is a state management library used in applications in JavaScript. It allows you to
manage the application's state in a centralized store, making it accessible to all components.
Instead of manually passing data through props from one component to another, Redux
ensures that all components can access the shared state. This centralized state management
helps in building large-scale applications efficiently and maintainably, especially when dealing
with complex data flow.
Ans: You need Redux when your application has multiple components that need to be shared
or managed in a global state. Without Redux, passing data between components can get
cumbersome, especially as your application grows. Redux simplifies this by allowing a single,
central store to hold the state, which any component can access and update. This makes
managing the state more predictable and the flow of data more transparent.
Top 20 React Redux Interview Questions and
Answers for Freshers
Q1. What is Redux?
Q3. What are the core principles of Redux?
Q2. Why do you need Redux in a React application?

Changes are made with pure functions: The logic for updating the state is encapsulated in
reducers, which are pure functions. These functions receive the current state and an action
and return a new state without mutating the previous one.
Ans: A reducer is a pure function that speciﬁes how the state of the application should change
in response to an action. It takes the current state and the action as arguments and returns a
new state. The state is not mutated directly; instead, a new copy of the state is created and
returned.
Ans: An action is a plain JavaScript object that describes what happened or what should
happen in the application. It is the only way to send information to the Redux store.
Actions typically have a type property, which is a string that identiﬁes the action, and an
optional payload, which contains any additional data the action needs to carry.
Q6. What is the Redux store?
Q4. What is an action in Redux?
Q5. What is a reducer in Redux?
const incrementAction = {
type: 'INCREMENT'
};
function counterReducer(state = 0, action) {
switch (action.type) {
}
}
case 'INCREMENT':
return state + 1;
case 'DECREMENT':
return state - 1;
default:
return state;

Ans: To connect React and Redux, you use the react-redux library. The Provider component is
used to pass the Redux store to your React component tree, allowing all components to access
the store. The connect function is used to connect speciﬁc components to the store and allows
those components to receive state and dispatch actions.
Ans: You create a Redux store by calling the createStore method and passing your root reducer
to it. The store can be conﬁgured with React Middleware, and it is typically wrapped in a
Provider component to make it available throughout your React component tree.
Ans: The store is a central repository where all of your application's state lives. It is created
using a reducer, and it holds the state of the entire application. The store allows you to
dispatch actions, subscribe to state changes, and get the current state of the application. In
essence, it acts as a centralized source of truth for your app's state.
Ans: Middleware in Redux provides a third-party extension point between dispatching an
action and the moment it reaches the reducer. It allows you to extend Redux's capabilities,
such as logging actions, handling asynchronous operations (e.g., API calls), and modifying
actions before they reach the reducer. Common middleware includes redux-thunk and redux-
saga.
Q10. What is the use of the
Q9. What is middleware in Redux?
Q7. How do you create a Redux store?
Q8. How do you connect React and Redux?
function?
combineReducers
import { Provider } from 'react-redux';
import { createStore } from 'redux';
const store = createStore(counterReducer);

Ans: You dispatch an action by calling the dispatch method on the Redux store. The dispatch
method takes an action object as an argument and sends it to the reducer for state updates.
Ans: The combineReducers function is used to combine multiple reducers into one. It allows
you to manage different slices of the state in separate reducer functions. This is useful when
you have a large application and want to break the state management into smaller, more
manageable pieces.
Ans: You handle asynchronous actions using middleware like redux-thunk or redux-saga.
These middlewares allow you to dispatch functions instead of plain action objects. The
function can contain asynchronous code like API requests, and once the data is received, it can
dispatch another action to update the state.
Ans: The Redux library is a more powerful and feature-rich tool for managing complex states in
large applications. It provides a central store, middleware, tools, and a more structured way to
manage the state. On the other hand, React's Context API is a simpler and more lightweight
tool primarily designed to share data across components without passing Props in React.
Redux is more suitable for large-scale applications where the state needs to be shared across
multiple components.
Q11. How do you dispatch an action?
Q13. How do you handle asynchronous actions in Redux?
Q12. What is the difference between Redux and Context API?
store.dispatch({ type: 'INCREMENT' });
import { combineReducers } from 'redux';
const rootReducer = combineReducers({
counter: counterReducer,
user: userReducer,
});

Q14. What is Redux Thunk?
Ans: Redux Thunk is a middleware that allows action creators to return functions instead of
plain action objects. These functions can contain asynchronous code and dispatch multiple
actions, making them suitable for handling complex, async-related actions like fetching data
from APIs.
Q15. What are selectors in Redux?
Ans: Selectors are functions that retrieve speciﬁc parts of the state from the Redux store. They
can be used to improve performance by memorizing the result of the state extraction and
preventing unnecessary re-renders of components. A selector is a function that takes the state
and returns the data that a component needs.
Q16. What is the role of the Provider component in Redux?
Ans: The Provider component is used to provide the Redux store to your entire React
application. It allows all components within the application to access the Redux store and
interact with it, either by reading state or dispatching actions. The Provider is typically used at
the top level of your component tree to ensure that the store is accessible to all components.
const fetchUser = () => {
return (dispatch) => {
};
};
fetch('/user')
.then(response => response.json())
.then(data => dispatch({ type: 'SET_USER', payload: data }));

Q20. How does Redux handle immutability?
Ans: Redux enforces immutability by making sure that the state is never mutated directly.
Instead of modifying the state directly, the state is replaced by a new object in the reducer.
This is achieved by using functions that return a new state object rather than modifying the
existing one. This immutability ensures that the application state remains predictable and
helps with
debugging and time-travel debugging using Redux DevTools.
Q18. What is the use of mapStateToProps and
mapDispatchToProps in Redux?
Ans: The mapStateToProps function is used to map the Redux store state to the props of a
React component. It allows the component to subscribe to speciﬁc parts of the state that it
needs. The mapDispatchToProps function is used to map action creators to the component's
props so that the component can dispatch actions. These functions are commonly used in
the connect function to link React components to the Redux store.
Q17. What is the purpose of the connect function in Redux?
Ans: The connect function is used to connect React components to the Redux store. It allows
components to access the store's state and dispatch actions. By using mapStateToProps and
mapDispatchToProps, you can specify which parts of the state a component should subscribe
to and which actions it can dispatch. This helps in optimizing performance by reducing
unnecessary renders and enabling eﬃcient state management.
Q19. What is the difference between the React Context API and
Redux?
Ans: The React Context API is a simpler tool built into React for passing data through the
component tree without manually passing props down at every level. It is best suited for
small- scale applications or sharing global data like themes or user authentication. On the
other hand, Redux is a more advanced state management library that provides a
structured approach to handling complex states in large applications. Redux includes a
global store, actions, reducers,
and middleware, making it more suitable for managing the state of large-scale applications
with complex logic.

Top 15 React Redux Interview Questions and Answers
for Intermediates
For those at an intermediate level, these top 15 React Redux interview questions will help you
deepen your understanding of concepts like middleware, asynchronous actions, performance
optimization, and best practices in state management. They will also enhance your ability to
explain Redux in real-world applications.
Ans: Some key advantages of using Redux in a React application include:
Ans: Middleware in Redux is a way to extend Redux’s capabilities. It acts as a middle layer
between dispatching an action and reaching the reducer, allowing you to intercept or modify
actions before they reach the reducer. This is particularly useful for handling asynchronous
actions, logging, or performing side effects. Some commonly used middlewares are:
Redux Thunk: Allows you to write action creators that return functions instead of action
objects, enabling asynchronous operations like API calls.
Redux Saga: A more advanced middleware for handling side effects, often used for
managing complex asynchronous ﬂows like retries, cancellations, etc.
Ans: The Redux library is a state management solution for JavaScript applications that
provides a predictable state container. It is designed for managing complex state across large
applications with many components. On the other hand, React's Context API is a lighter,
simpler tool for passing data between components without the need for props. While Redux is
best suited for large-scale applications requiring actions, middleware, and more structured
management, the Context API is better for smaller apps or situations where you don't need
complex state management.
Q23. What are the advantages of using Redux in a React
application?
Q22. Explain the concept of middleware in Redux. Can you name
some commonly used middleware?
Q21. What is the difference between Redux and React's Context
API?

Ans: Action creators are functions that return action objects. They help ensure actions are
created consistently across your application. Instead of directly creating action objects,
which can lead to errors, you use action creators to encapsulate this process. Action
creators can also be used to handle more complex logic, such as asynchronous operations.
An action creator might look like this:
Ans: The store in Redux holds the entire state of your application. It's the central place where
all application data resides. The store is created by calling createStore() and can be
accessed by components via the useSelector hook (in functional components) or connect (in
class components). The store provides three key functions:
getState(): Allows access to the current state.
dispatch(): Dispatches actions that trigger state changes.
subscribe(): Registers a callback to listen for state updates.
Predictable state: Redux ensures that your application state is predictable, as it’s stored in
a single object that can only be modiﬁed by dispatching actions.
Centralized state management: All state is stored in one place, making it easier to manage,
debug, and update state across your application.
Middleware support: Redux allows middleware for handling side effects, making it easy to
deal with asynchronous operations.
DevTools integration: Redux works seamlessly with Redux DevTools for inspecting
actions, states, and even time travel debugging.
Q24. Can you explain how Redux's store works?
Q25. What is the purpose of action creators in Redux?
function fetchUserData() {
return async (dispatch) => {
const response = await fetch('/api/user');
const data = await response.json();
dispatch({ type: 'USER_FETCH_SUCCESS', payload: data });
};
}

Q27. What are "reducer" functions in Redux?
Ans: A reducer in Redux is a pure function that takes the current state and an action as
arguments and returns a new state. It determines how the state should change in
response to an action. Reducers do not modify the current state directly but return a new
state object. This ensures that state changes are predictable and traceable. Here’s an
example of a simple reducer:
Q26. What is the purpose of the combineReducers function in
Redux?
Ans: The combineReducers function is used to combine multiple reducers into a single reducer
function. It is necessary when your application has multiple slices of state, and each slice has
its own reducer. It helps keep your reducer logic modular and organized. Here's an example:
user: userReducer,
posts: postsReducer,
comments: commentsReducer
});
import { combineReducers } from 'redux';
function userReducer(state = {}, action) {
}
}
case 'SET_USER':
return { ...state, user: action.payload };
default:
return state;

Q30. What is the purpose of Redux DevTools?
Ans: Redux DevTools is a set of developer tools that allow you to inspect and debug the Redux
store. It provides features like time-travel debugging, inspecting actions and states, and even
dispatching actions manually. It’s extremely useful for understanding how the state changes
over time and troubleshooting issues in complex Redux applications. The tools can be
integrated into your application by adding the Redux DevTools extension or configuring it
programmatically.
Q29. Can you explain the concept of "selector" in Redux?
Ans: A selector is a function that extracts and derives data from the Redux store. Selectors can
be used to compute derived data, combine multiple pieces of state, or filter data before
passing it to a component. Selectors help make the code more readable and maintainable. You
can use libraries like Reselect to create efficient, memoized selectors. Here's an example:
Q28. How would you optimize performance in Redux-based
applications?
Ans: Optimizing performance in Redux can involve several strategies:
Memoization: Use Reselect to memoize selectors, preventing unnecessary re-renders of
components.
Lazy loading: Lazy loadingin React Load reducers only when they are needed to avoid
unnecessary state updates in parts of the app that are not currently in use.
Batching updates: Avoid multiple dispatches in quick succession by batching updates to
prevent unnecessary re-renders.
Immutable data structures: Use immutable data structures to prevent accidental
mutations, which can lead to unnecessary re-renders.
import { createSelector } from 'reselect';
const selectUserData = (state) => state.user;
const selectUserName = createSelector([selectUserData], (user) => user.name);

Q33. What is a "payload" in a Redux action?
Ans: The payload in a Redux action refers to the data that is passed along with the action to
update the store. The payload typically contains the necessary information to modify the
state. For example:
Q31. What is the concept of "action types" in Redux?
Ans: In Redux, action types are constants that define the type of action being dispatched.
These constants help identify what kind of state change an action is requesting. It’s a best
practice to define action types as constants to avoid typos in action creators or reducers.
For example:
Q32. How do you handle async operations in Redux?
Ans: Async operations are handled in Redux using middleware such as Redux Thunk or Redux
Saga. These middlewares allow you to dispatch functions (in the case of Redux Thunk) or
manage complex asynchronous flows (in the case of Redux Saga). With Redux Thunk, an
action creator can return a function instead of an action, which can then dispatch actions
based on the outcome of the asynchronous operation.
const action = {
type: 'ADD_ITEM',
payload: { id: 1, name: 'Item 1' }
export const ADD_ITEM = 'ADD_ITEM';
export const REMOVE_ITEM = 'REMOVE_ITEM';

Q34. What are "actions" in Redux?
Ans: In Redux, actions are plain JavaScript objects that represent an event or a change that
you want to happen in the application’s state. An action must have a type property that
describes the action being performed. It may also have additional data, typically in a payload
property, which provides the information necessary for updating the state. Actions are
dispatched to trigger state changes in the Redux store.
Q35. How would you handle large-scale state management in a
Redux-based application?
Ans: To handle large-scale React State management in a Redux-based application, you should
focus on structuring your state, actions, and reducers efficiently. Some strategies to manage
large-scale state include:
For experienced professionals, these top 25 React Redux interview questions will help you
master advanced concepts like middleware, async state management with Redux Thunk or
Saga, performance optimization, and best practices. They will also enhance your ability to
build scalable and efficient Redux applications.
Modularize reducers: Use combineReducers to break down the state into smaller,
manageable parts. This way, each reducer only handles a specific slice of the state.
Normalize state: Flatten nested objects or arrays within the state. Tools like normalizr can
help keep your data normalized, making it easier to manage.
Use selectors: Utilize selectors (using libraries like Reselect) to avoid repetitive logic and
optimize performance by memoizing complex derived state.
Lazy load reducers: For applications with large amounts of state, consider using code
splitting or lazy loading of reducers only when necessary, preventing unnecessary large
chunks of state from being loaded all at once.
Implement pagination or infinite scroll: For large datasets, implement pagination or infinite
scroll to reduce the amount of data loaded at once and to manage state more efficiently.
Top 25 React Redux Interview Questions and
Answers for experienced
};

Q36. How do you structure a large-scale Redux application?
A large-scale Redux application should follow a modular structure to maintain scalability and
maintainability. A common approach is to structure it by feature:
Q37. What are the best practices for managing complex state in
Redux?
To manage complex state efficiently:
Normalize State: Use a flat structure instead of deeply nested objects.
Use Slices: Divide state into feature-specific slices using Redux Toolkit.
Use Selectors: Keep logic separate from components with Reselect.
Async Handling: Use Redux Thunk or Redux Saga for side effects.
Persist Data: Use Redux Persist to retain state between reloads.
Store: Contains the main Redux store configuration.
Features: Each feature has its own slice with actions, reducers, and selectors.
Components: UI components connected to Redux.
Hooks: Custom hooks for encapsulating Redux logic.
Example folder structure:
/src
├── store/
│
│
│
├── index.js
├── rootReducer.js
├── middleware.js
├── features/
│
│
│
│
│
│
│
│
├── auth/
│
│
│
├── authSlice.js
├── authActions.js
├── authSelectors.js
├── user/
│
│
│
├── userSlice.js
├── userActions.js
├── userSelectors.js

Q40. How do you handle race conditions in Redux?
Race conditions occur when multiple async operations compete for the same state. To handle
them:
Q38. How does Redux persist state between page reloads?
Redux state is lost on a page reload unless persisted using Redux Persist. It stores the Redux
state in localStorage or sessionStorage.
Q39. What is the difference between Redux Saga and Redux
Thunk?
Redux Thunk and Redux Saga are middleware for handling asynchronous actions, but they
work differently:
Q41. What are some common performance pitfalls in Redux, and
how do you avoid them?
Cancellation Tokens: Use AbortController for API requests.
Redux Saga Effects: Use takeLatest to cancel previous requests.
Redux Thunk: Uses functions to dispatch async actions, working well for simple cases.
Redux Saga: Uses generator functions for better control over async ﬂows, suitable for
complex side effects.
const persistConfig = {
key: 'root',
storage,
};
import { persistStore, persistReducer } from 'redux-persist';
import storage from 'redux-persist/lib/storage';
import { createStore } from 'redux';
const persistedReducer = persistReducer(persistConfig, rootReducer);
const store = createStore(persistedReducer);
const persistor = persistStore(store);

Optimistic updates assume success before the server conﬁrms. Steps:
1. Update the UI immediately.
2. Send the API request.
3. Revert changes if the request fails.
Use Redux DevTools to inspect state changes, actions, and time travel debugging.
Normalization ﬂattens deeply nested objects to improve performance and maintainability.
Common pitfalls include:
Unnecessary Renders: Avoid excessive re-renders by using memoization with Reselect.
Large State Trees: Normalize state to prevent deep object updates.
Too Many Actions: Batch actions to reduce state updates.
Reselect improves performance by memoizing derived state, preventing unnecessary re-
computation.
Q43. What is the role of reselect in Redux applications?
Q44. How do you debug a Redux application effectively?
Q45. What are normalized state shapes, and why are they
important in Redux?
Q42. How do you implement optimistic updates in Redux?
import { createSelector } from 'reselect';
const selectUsers = (state) => state.users;
const selectActiveUsers = createSelector([selectUsers], (users) =>
users.filter((user) => user.active)
);

Q48. How do you implement authentication and authorization using
Redux?
In Redux, authentication and authorization are managed by storing user authentication tokens
and roles in the Redux store. Middleware is used to intercept actions and restrict access based
on authentication status. When a user logs in, the token is stored in Redux and optionally
persisted using Redux Persist. Protected routes ensure that unauthorized users are redirected
to login pages.
Q46. How do you handle server-side rendering (SSR) with Redux?
Server-side rendering (SSR) with Redux involves initializing the Redux store on the server
before sending the HTML to the client. In frameworks like Next.js, you can use
getServerSideProps or getInitialProps to fetch data and pre-populate the Redux store. The
preloaded state is then sent to the client, where Redux rehydrates it, ensuring the
application starts with the correct state.
Q49. How can you manage multiple reducers efficiently in Redux?
Q47. What is the difference between Redux Toolkit and traditional
Redux?
Redux Toolkit simplifies Redux development by reducing boilerplate code and providing built-in
support for reducers, actions, and middleware. Traditional Redux requires manually defining
action creators, reducers, and middleware, which can be repetitive. Redux Toolkit introduces
createSlice for managing reducers efficiently, configureStore for setting up the store with
middleware, and includes Immer for immutable state updates.

To manage multiple reducers efficiently, use the combineReducers function, which allows
splitting Redux state into separate, independent modules. Each reducer handles a specific slice
of the state, such as authentication, user data, or UI state. This improves code maintainability
and scalability in large applications.
Managing form state in Redux can be done by storing input values in the Redux store and
updating them through actions. Libraries like Redux Form and Formik simplify form
handling by managing field updates, validation, and submission logic. Keeping form state
in Redux
allows centralized state tracking for complex forms used across multiple components.
To optimize a Redux application for mobile devices, minimize state size, reduce unnecessary
re-renders, and batch multiple state updates. Use Reselect for memoized selectors, avoid
deeply nested state structures, and implement lazy loading for large datasets. Optimizing
network requests by caching responses can also enhance performance.
Redux Persist is a library that enables persistence of the Redux state across page reloads by
storing data in local storage or session storage. It wraps the Redux store and automatically
saves and rehydrates state when the application loads, preventing data loss on refresh.
To handle WebSockets in Redux, use middleware that listens for WebSocket events and
dispatches actions based on the received data. The middleware establishes a WebSocket
connection, processes incoming messages, and updates the Redux store in real time. This
ensures the UI stays synchronized with the backend data.
Q51. What is Redux Persist, and how does it work?
Q52. How do you manage form state using Redux?
Q53. How do you optimize a Redux application for mobile
devices?
Q50. How do you handle WebSockets and real-time updates in
Redux?
Q54. What are the trade-offs of using Redux vs. React Context for
state management?

Handling API request failures in Redux involves dispatching error actions and implementing
retry strategies. Middleware like Redux Thunk or Redux Saga can catch errors and trigger
fallback actions. Displaying error messages and using exponential backoff for retries ensures
a better user experience, preventing unnecessary disruptions caused by network failures.
Entity normalization in Redux structures state efficiently by storing entities in a flat format.
Instead of keeping nested objects, data is stored using an entities object where each entity
type is a key, and its values are stored by unique IDs. This improves state management,
performance, and lookup efficiency.
To implement entity normalization:
Use libraries like normalizr to structure the data automatically.
Store entities in a dictionary format (e.g., state.users.byId[userId]).
Maintain an ids array to track entity order.
Use selectors to access denormalized data.
Redux is more suitable for complex global state management, offering structured data flow,
debugging tools, and middleware support. However, it introduces additional setup and
complexity. React Context is a built-in, lightweight alternative for managing state in small
applications but can lead to performance issues due to excessive re-renders in deeply nested
components.
Q56. What is entity normalization in Redux, and how do you
implement it?
Q55. How do you handle API request failures gracefully in Redux?
import { normalize, schema } from 'normalizr';
const normalizedData = normalize(apiResponse, article);
console.log(normalizedData);
const user = new schema.Entity('users');
const article = new schema.Entity('articles', { author: user });

Q58. How do you test Redux reducers, actions, and selectors?
Testing Redux ensures state management functions correctly. Use Jest and React Testing
Library for testing.
Q57. How do you handle module splitting in Redux for large-scale
applications?
Handling module splitting in Redux ensures better code organization and performance. Instead
of loading all reducers at once, dynamically load parts of the Redux store when needed.
Reducers: Validate state transitions.
Actions: Ensure correct action objects.
Selectors: Verify data retrieval.
Best practices:
Use React.lazy and loadable-components for code-splitting.
Inject reducers dynamically using store.replaceReducer.
Organize Redux modules by feature (e.g., authentication, cart).
import reducer from '../reducers';
import { someAction } from '../actions';
test('should return the initial state', () => {
const asyncReducer = (state = {}, action) => {
}
};
case 'DYNAMIC_ACTION':
return { ...state, data: action.payload };
default:
return state;
store.replaceReducer(combineReducers({ async: asyncReducer }));

Q59. How do you handle undo and redo functionality in Redux
applications?
Implementing undo and redo in Redux requires tracking previous states and future states.
Q60. How do you migrate a legacy React application to use Redux
eﬃciently?
Migrating a legacy React application to Redux requires a step-by-step approach.
Identify global state: Determine shared state.
Introduce Redux gradually: Start with a single feature.
Use Redux Toolkit: Simplify state management.
Refactor components: Replace prop-drilling with Redux state.
Store an array of past states and future states.
Push current state to past states on each action.
Provide UNDO and REDO actions.
store.dispatch({ type: 'UNDO' });
store.dispatch({ type: 'REDO' });
import undoable from 'redux-undo';
counter: undoable(counterReducer)
});
expect(reducer(undefined, {})).toEqual(initialState);
});
test('should handle SOME_ACTION', () => {
expect(reducer(initialState, someAction())).toEqual(expectedState);
});

(a) A React library for animations
(b) A state management library
(c) A database for React applications
(d) A CSS framework
Read More: React Interview Questions & Answers
The React Redux Interview Questions article covers 60+ essential questions to help you
master Redux concepts like state management, actions, reducers, middleware, and best
practices. It provides clear explanations and real-world insights to boost your confidence in
interviews. Whether you're a beginner or an experienced developer, these questions will help
you strengthen your understanding of Redux.Looking to level up your React skills? Check out
the ReactJS Certification Training and become a certified expert!
Summary
React Redux Interview Questions - Test Your
Knowledge!
Q 1: What is Redux in React?
const counterSlice = createSlice({
name: 'counter', initialState: 0,
reducers: {
increment: (state) => state + 1,
},
});
const store = configureStore({
reducer: { counter: counterSlice.reducer },
});
import { configureStore, createSlice } from '@reduxjs/toolkit';

View Answer
(a) Single source of truth
(b) State is read-only
(c) Changes are made with pure functions
(d) All of the above
View Answer ⬇
(a) A function that updates the state
(b) An object that describes what should change
(c) A built-in method of Redux
(d) A component in React
View Answer ⬇
(a) A function that intercepts actions
(b) A built-in React function
(c) A component that connects Redux with React
(d) A Redux reducer
View Answer ⬇
(a) A function that modiﬁes state based on actions
(b) A built-in React Hook
(c) A database query
(d) A Redux middleware
View Answer ⬇
⬇
Q 3: What is an action in Redux?
Q 4: What is a reducer in Redux?
Q 5: What is middleware in Redux?
Q 2: What are the core principles of Redux?

React Redux Interview Questions PDF By ScholarHat

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React Redux Interview Questions PDF By ScholarHat