Top 40 Redux Interview Questions and Answers 2024

Redux is a state management library for JavaScript apps. Redux Saga is a middleware for Redux that handles side effects.

• Redux is used to manage the state of an application in a predictable way

• Redux Saga is a middleware that allows for handling side effects such as asynchronous API calls

• Redux Saga uses generator functions to make asynchronous code easier to read and test

• Redux Saga can be used to handle complex workflows such as authentication and data fetching

React is a JavaScript library for building user interfaces, Redux is a predictable state container for managing application state.

• React is a front-end library developed by Facebook for building user interfaces.

• Redux is a state management library commonly used with React to manage application state in a predictable way.

• React allows for building reusable UI components, while Redux helps in managing the state of the application.

• React uses a virtual DOM for efficient rendering, w...read more

Redux is a predictable state container for JavaScript apps.

• Redux stores the entire state of the application in a single immutable object.

• State changes are made by dispatching actions, which are plain JavaScript objects.

• Reducers specify how the state changes in response to actions.

• Components can subscribe to the Redux store to access the state and re-render when it changes.

Redux is a predictable state container for JavaScript apps. Context API is a way to pass data through the component tree without having to pass props down manually.

• Redux is a state management library commonly used with React to manage application state in a predictable way.

• Redux follows a unidirectional data flow pattern, where the state of the whole application is stored in a single store.

• Actions are dispatched to update the state in Redux, and reducers specify how the state...read more

Redux Toolkit is the official, recommended way to write Redux logic. It simplifies the process of managing state in React applications.

• Redux Toolkit provides a set of tools and best practices to streamline Redux development.

• It includes utilities like createSlice, createReducer, and configureStore to simplify the code and reduce boilerplate.

• Redux Toolkit also includes built-in Immer integration for writing immutable update logic more easily.

• It encourages writing Redux code in ...read more

Flow of Redux and code for promises

• Redux flow involves dispatching actions, reducers updating state, and components subscribing to state changes

• Promises are used for asynchronous operations and have a resolve and reject function

• Example code for promises: new Promise((resolve, reject) => { // code here })

Redux is a state management library for JavaScript applications. Middleware is a function that intercepts actions before they reach the reducer.

• Redux is used to manage the state of an application in a predictable way.

• Middleware in Redux allows you to write logic that has access to the actions being dispatched.

• Common middleware in Redux includes logging, asynchronous API calls, and routing.

• Example: Redux Thunk is a popular middleware for handling asynchronous actions in Redux.

Redux life cycle involves actions, reducers, store, and state management in a predictable flow.

• Actions are dispatched to trigger state changes

• Reducers specify how the state should change based on the action type

• Store holds the application state

• State is updated immutably

Redux is a predictable state container for JavaScript apps.

• Redux is a state management library commonly used with React.

• It helps in managing the state of an application in a predictable way.

• Redux follows a unidirectional data flow architecture.

• Actions are dispatched to update the state through reducers.

• State is stored in a single immutable state tree.

Redux is a predictable state container for JavaScript apps.

• Redux is a state management library for JavaScript applications.

• It helps in managing the state of an application in a predictable way.

• Redux follows a unidirectional data flow pattern.

• To implement Redux, we need to define actions, reducers, and a store.

• Actions are plain JavaScript objects that describe what happened.

• Reducers specify how the application's state changes in response to actions.

• The store holds the state of...read more

Redux is a predictable state container for JavaScript apps, and RxJS is a library for reactive programming using Observables.

• Redux is a state management tool commonly used with React to manage application state in a predictable way.

• RxJS is a library for reactive programming that allows you to work with asynchronous data streams using Observables.

• Redux helps in managing the state of the application in a single immutable state tree.

• RxJS allows you to work with asynchronous data...read more

Firebase is a backend platform for building web and mobile applications, while Redux is a state management library for JavaScript applications.

• Firebase provides a real-time database, authentication, hosting, and other services for web and mobile apps.

• Redux is used to manage the state of an application in a predictable way, making it easier to debug and test.

• Firebase can be used with Redux to store and retrieve data from the database, and update the state of the application ac...read more

Redux is a state management library for JavaScript applications, while virtual DOM is a lightweight copy of the actual DOM used for efficient rendering in React.

• Redux is used to manage the state of an application in a predictable way.

• It helps in maintaining a single source of truth for the state of the application.

• Virtual DOM is a lightweight copy of the actual DOM used by React to improve performance.

• It allows React to efficiently update the actual DOM by only re-rendering t...read more

Yes, I have hands-on experience with both Redux and Recoil.

• I have used Redux in multiple projects to manage the state of the application.

• I have also worked with Recoil, which is a newer state management library developed by Facebook.

• I am familiar with the concepts of actions, reducers, and stores in Redux.

• I have used selectors and atoms in Recoil to manage the state of the application.

• I am comfortable working with both libraries and can choose the appropriate one based on the...read more

Redux and Flux are state management libraries for JavaScript applications.

• Redux and Flux help manage the state of an application by providing a unidirectional data flow.

• Flux was developed by Facebook and Redux was inspired by Flux.

• Redux uses a single store to manage the state of an application, while Flux uses multiple stores.

• Both libraries use actions to update the state and reducers to handle those actions.

• Redux has become more popular in recent years due to its simplicity ...read more

Data flows in Redux through a unidirectional flow of actions, reducers, and store.

• Actions are dispatched by components to describe what happened.

• Reducers specify how the state should change in response to actions.

• The store holds the application state and allows access to it.

• Components can subscribe to the store to receive updates when the state changes.

Dataflow in Redux is the unidirectional flow of data through the Redux store.

• Redux follows a strict unidirectional data flow pattern.

• Actions are dispatched to the store, which updates the state.

• The updated state is then passed down to the components for rendering.

• Components can dispatch actions to the store to update the state.

• This ensures that the state of the application is predictable and easy to reason about.

Redux is a predictable state container for JavaScript apps. React Navigation is used for navigation in React Native.

• Redux is a state management library commonly used with React to manage application state in a predictable way.

• It helps in maintaining a single source of truth for the state of the entire application.

• Redux works by having a central store that holds the entire state tree of the application.

• React Navigation is a library used for navigation in React Native applicati...read more

Redux is a state management library for JavaScript applications, allowing for centralized state management.

• Redux stores the entire state of the application in a single immutable object.

• Actions are dispatched to update the state, with reducers specifying how the state should change.

• Components can subscribe to the Redux store to access and update the state.

• Redux DevTools can be used to track state changes and debug the application.

• Example: dispatching an action to add an item t...read more

Redux is a predictable state container for JavaScript apps.

• Redux is a state management library for JavaScript applications.

• It provides a centralized store to manage the state of an application.

• Redux follows a unidirectional data flow pattern.

• Actions are dispatched to the store, which updates the state and notifies the UI.

• Selectors can be used to retrieve data from the store.

• Middleware can be used to intercept and modify actions before they reach the store.

• The life cycle of Re...read more

Redux is a predictable state container for JavaScript apps. useRef is a hook in React for accessing DOM nodes.

• Redux is a state management library for JavaScript applications

• It helps in managing the state of an application in a predictable way

• Redux follows a unidirectional data flow pattern

• useRef is a hook in React that allows accessing DOM nodes or any other mutable value

• It returns a mutable ref object that persists across re-renders

Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a single immutable state tree.

• Redux is commonly used with React to manage the state of the application.

• To create a store in Redux, you need to use the createStore function from the Redux library.

• Example: const store = createStore(reducer);

createSlice is a function in Redux Toolkit that simplifies the process of creating Redux slices.

• createSlice is a function provided by Redux Toolkit for creating Redux slices with less boilerplate code.

• It allows developers to define a slice of the Redux state, including initial state, reducers, and action creators.

• createSlice automatically generates action types and action creators based on the defined reducers.

• It is commonly used in React applications to manage state using Re...read more

React Query is a library for managing server state in React applications, while Redux is a state management library for managing client-side state.

• React Query is specifically designed for managing server state, making it easier to fetch, cache, and update data from APIs.

• Redux is a more general-purpose state management library that can be used for managing client-side state in a predictable way.

• React Query provides built-in caching, pagination, and refetching capabilities, whi...read more

Redux is a predictable state container for JavaScript apps. Hooks are a new addition in React 16.8 that lets you use state and other React features without writing a class.

• Redux is a state management tool commonly used with React to manage application state in a predictable way

• Hooks are a new addition in React 16.8 that allow you to use state and other React features without writing a class

• Examples of hooks include useState, useEffect, useContext, etc.

Redux is a state management library for JavaScript applications, while local storage is a browser feature for storing data locally.

• Redux is used for managing the global state of an application, making it easier to access and update data across components.

• Local storage is used for storing data locally on the user's device, allowing for persistent data even after the browser is closed.

• Redux is typically used for more complex state management scenarios, while local storage is mo...read more

Redux is a predictable state container for JavaScript apps.

• Redux is a state management library for JavaScript applications.

• It provides a centralized store to manage the state of an application.

• Redux follows a unidirectional data flow pattern.

• Actions are dispatched to update the state in the store.

• Reducers are pure functions that update the state based on the dispatched actions.

• Selectors are used to retrieve data from the store.

• Middleware can be used to intercept and modify ac...read more

useSelector is a hook provided by React-Redux for accessing the Redux store state in functional components.

• Allows functional components to access the Redux store state without connecting to the store

• Accepts a selector function as an argument to specify which part of the state to extract

• Automatically subscribes to the Redux store updates and re-renders the component when the selected state changes

Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized store.

• Create a Redux store to hold the state of the application

• Define actions to describe state changes

• Write reducers to specify how the state changes in response to actions

• Dispatch actions to update the state in the store

• Connect components to the Redux store using the connect function from react-redux

Redux provides a centralized state management solution with advanced features compared to Context API.

• Redux allows for a more scalable and maintainable application architecture.

• Redux provides a single source of truth for the application state.

• Redux supports time-travel debugging and middleware for advanced functionality.

• Redux has a large and active community with extensive documentation and ecosystem.

• Context API is simpler and suitable for small-scale applications with limite...read more

Redux is a predictable state container for JavaScript apps. Redux Toolkit is the official, recommended way to write Redux logic.

• Redux is a state management library for JavaScript applications, commonly used with React.

• It helps in managing the state of an application in a predictable way.

• Redux Toolkit is the official, recommended way to write Redux logic, providing utilities to simplify common Redux use cases.

• It includes functions like 'createSlice' for defining Redux state sl...read more

React hooks and Redux serve different purposes but can be used together for state management.

• React hooks are used for managing state and lifecycle methods within a component.

• Redux is used for managing global state across the entire application.

• React hooks can be used with Redux to manage local state within a component.

• Redux can be used to manage state that needs to be accessed by multiple components.

• Both React hooks and Redux can improve code organization and maintainability.

Redux is a state management library for React applications. Middleware is a function that intercepts actions before they reach the reducer.

• Redux is used to manage the state of a React application in a predictable way

• Middleware in Redux allows you to write logic that can intercept and modify actions before they reach the reducer

• Common middleware in Redux includes redux-thunk for async actions and redux-logger for logging actions

Redux is a predictable state container for JavaScript apps.

• Redux is a state management library for JavaScript applications.

• It helps in managing the state of the application in a predictable way.

• Redux follows a unidirectional data flow pattern.

• Actions are dispatched to update the state in the store.

• Components can subscribe to the store to get updates.

Redux can be implemented in a React project by setting up a store, defining actions, creating reducers, and connecting components.

• Create a Redux store to hold the state of the application

• Define actions to describe the changes in the application state

• Write reducers to specify how the state changes in response to actions

• Connect React components to the Redux store using the 'connect' function from 'react-redux'

• Use the 'Provider' component from 'react-redux' to make the Redux sto...read more

Redux passes states to components through the connect function provided by react-redux library.

• Redux passes states to components by connecting the component to the Redux store using the connect function.

• The connect function takes mapStateToProps as an argument, which maps the state from the Redux store to props of the component.

• The connected component can then access the state from the Redux store as props.

Redux is a state management library for JavaScript applications.

• Redux helps manage the state of an application in a predictable way.

• It uses a single store to manage the state of the entire application.

• Context is a feature in React that allows data to be passed down the component tree without having to pass props manually.

• Redux is more suitable for larger applications with complex state management needs, while context is better for smaller applications with simpler state manag...read more

Redux is a predictable state container for JavaScript apps. It helps manage the state of your application in a more organized way.

• Redux is typically used in large-scale applications with complex state management needs

• It helps in maintaining a single source of truth for the state of your application

• Redux works well with React, but can be used with any other JavaScript framework or library

• Actions are dispatched to update the state in a predictable way

React is a JavaScript library for building user interfaces. Redux is a predictable state container for managing application state.

• React is a front-end library developed by Facebook for building user interfaces.

• React uses a virtual DOM to efficiently update the actual DOM.

• Redux is a state management tool commonly used with React to manage application state.

• Redux stores the entire application state in a single immutable object.

Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized way.

• Redux is a state management library commonly used with React.

• It allows for a single source of truth for the state of an application.

• Actions are dispatched to update the state, and reducers specify how the state changes in response to actions.

• Redux DevTools can be used to track state changes and debug the application.

• Selectors can be used to efficiently ...read more

Redux for complex state management, Context API for simpler state sharing

• Use Redux for complex state management with multiple components needing access to the same state

• Context API is suitable for simpler state sharing between parent and child components

• Redux is more suitable for larger applications with a lot of state changes and actions

• Context API is easier to set up and use for smaller applications or components

Creating a simple app using Redux for state management in a front end application.

• Set up Redux store with reducers and actions

• Connect components to Redux store using mapStateToProps and mapDispatchToProps

• Dispatch actions to update state in Redux store

• Use combineReducers to manage multiple reducers

Experienced in using Redux with React for state management in web development projects.

• Utilized Redux to manage state in complex React applications

• Created actions, reducers, and connected components to Redux store

• Implemented middleware like Thunk or Saga for asynchronous actions

• Debugged and optimized Redux store for better performance

Redux is a popular state management library for JavaScript applications.

• Redux is commonly used with React to manage the state of an application.

• It follows a unidirectional data flow, where actions are dispatched to update the state.

• Reducers are pure functions that specify how the state should change in response to actions.

• Selectors can be used to efficiently extract specific pieces of state from the store.

• Middleware can be used to add additional functionality to Redux, such a...read more

Redux is a predictable state container for JavaScript apps. It helps manage the state of your application in a single store.

• Redux is commonly used with React to manage the state of components.

• Actions are dispatched to update the state in the Redux store.

• Reducers specify how the state should change in response to actions.

• Selectors are used to extract specific pieces of state from the store.

• Middleware can be used to add additional functionality to Redux, such as logging or asyn...read more

React Redux is a state management library for React applications.

• React Redux helps manage the state of a React application in a predictable way

• It allows for a centralized store to hold the application's state

• Actions are dispatched to update the state, and reducers specify how the state should change

• Selectors can be used to retrieve specific pieces of state from the store