Learn How to Download Redux React and Use It in Your Next Project
How to Download Redux React
What is Redux React?
Redux React is the official UI bindings layer for Redux. It lets your React components read data from a Redux store, and dispatch actions to the store to update the state. It also implements some best practices and patterns for writing Redux code, such as using immutable updates, pure reducer functions, and selector functions.
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Benefits of Redux React
Some of the benefits of using Redux React are:
It centralizes the state management system in a single store, which makes it easier to access and debug.
It improves the performance by avoiding unnecessary re-renders and using memoized selectors.
It simplifies the code by using custom hooks that abstract away the store interaction logic.
It enables time-travel debugging with the Redux DevTools extension.
It supports TypeScript and provides type definitions for all its APIs.
Common Errors in Redux React
Some of the common errors that you may encounter while using Redux React are:
Mutating the state or action arguments in the reducer functions. This can cause bugs and break the time-travel debugging feature. You should always return a new state object without modifying the previous one.
Having side effects in the reducer functions. This can make your code unpredictable and hard to test. You should only use pure functions that depend on their state and action arguments, and use middleware for any asynchronous or impure logic.
Using redux related re-render in your components. This can cause performance issues and unnecessary updates. You should use useSelector and useDispatch hooks instead of connect or mapStateToProps and mapDispatchToProps.
How to Install Redux React
To use Redux React with your React app, you need to install both Redux and React Redux as dependencies. You can use npm or yarn to do that.
You need to have Node.js and npm or yarn installed on your machine. You also need to have a React app set up, either by using create-react-app or any other tool.
Steps to Install Redux React
Open your terminal and navigate to your project folder.
Run the following command to install Redux and React Redux:
# If you use npm: npm install redux react-redux # Or if you use Yarn: yarn add redux react-redux
You should see a message confirming that the installation was successful.
How to Use Redux React
To use Redux React in your app, you need to follow these steps:
Create a Redux Store
A Redux store is an object that holds the state of your app and allows you to dispatch actions and subscribe to changes. To create a store, you need to use the configureStore API from Redux Toolkit, which is a package that simplifies the Redux development process.
Create a file named src/app/store.js. Import configureStore from @reduxjs/toolkit. Pass an empty object as the reducer argument for now. Export the store as default:
// src/app/store.js // src/app/store.js import configureStore from '@reduxjs/toolkit'; const store = configureStore( reducer: ); export default store;
You can add more reducers later as you create your state slices.
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Provide the Redux Store to React
To make the Redux store available to your React components, you need to use the Provider component from React Redux. It wraps your app and passes the store as a prop.
Open your src/index.js file. Import Provider from react-redux and store from src/app/store.js. Wrap your component with and pass store as a prop:
// src/index.js import React from 'react'; import ReactDOM from 'react-dom'; import Provider from 'react-redux'; import store from './app/store'; import App from './App'; ReactDOM.render(
, document.getElementById('root') );
Now your app is ready to use Redux React.
Create a Redux State Slice
A Redux state slice is a piece of state that corresponds to a specific feature or domain of your app. It consists of a reducer function, an initial state, and some action creators. To create a state slice, you need to use the createSlice API from Redux Toolkit, which generates all the boilerplate code for you.
For example, let's create a state slice for a counter feature. Create a file named src/features/counter/counterSlice.js. Import createSlice from @reduxjs/toolkit. Call createSlice with an object that has the following properties:
name: A string that identifies the slice. It will be used as a prefix for the action types.
initialState: The initial value of the state.
reducers: An object that defines the reducer functions for each action type. The keys are the action names, and the values are the reducer functions that take the state and action as arguments and return the new state.
Export the slice as default, and also export the action creators and the selector function that are generated by createSlice:
// src/features/counter/counterSlice.js import createSlice from '@reduxjs/toolkit'; const counterSlice = createSlice( name: 'counter', initialState: value: 0 , reducers: increment: (state) => // Redux Toolkit allows us to write "mutating" logic in reducers. It // doesn't actually mutate the state because it uses the Immer library, // which detects changes to a "draft state" and produces a brand new // immutable state based off those changes state.value += 1; , decrement: (state) => state.value -= 1; , incrementByAmount: (state, action) => // The payload is the argument passed to the action creator state.value += action.payload; ); // Export the slice as default export default counterSlice; // Export the action creators export const increment, decrement, incrementByAmount = counterSlice.actions; // Export the selector function export const selectCount = (state) => state.counter.value;
You can create more state slices for other features of your app in a similar way.
Access the Redux State and Dispatch Actions
To access the Redux state and dispatch actions in your React components, you need to use the useSelector and useDispatch hooks from React Redux. They allow you to select a part of the state and dispatch an action without using connect or mapStateToProps and mapDispatchToProps.
For example, let's create a component that displays the counter value and has some buttons to increment, decrement, and increment by a custom amount. Create a file named src/features/counter/Counter.js. Import React, useState, useSelector, useDispatch from their respective packages. Import increment, decrement, incrementByAmount, and selectCount from src/features/counter/counterSlice.js. Define a functional component named Counter that does the following:
Use useSelector to get the current count value from the Redux store by