Getting Started with React Redux#

React Redux is the official React UI bindings layer for Redux. It lets your React components read data from a Redux store, and dispatch actions to the store to update state.

Installation#

React Redux 7.1+ requires React 16.8.3 or later, in order to make use of React Hooks.

Using Create React App#

The recommended way to start new apps with React Redux is by using the official Redux+JS template for Create React App, which takes advantage of Redux Toolkit.

npx create-react-app my-app --template redux

An Existing React App#

To use React Redux with your React app, install it as a dependency:

# If you use npm:
npm install react-redux

# Or if you use Yarn:
yarn add react-redux

You'll also need to install Redux and set up a Redux store in your app.

If you are using TypeScript, the React Redux types are maintained separately in DefinitelyTyped. You'll need to install those as well:

npm install @types/react-redux

`Provider`#

React Redux includes a <Provider /> component, which makes the Redux store available to the rest of your app:

import React from 'react'
import ReactDOM from 'react-dom'

import { Provider } from 'react-redux'
import store from './store'

import App from './App'

const rootElement = document.getElementById('root')
ReactDOM.render(
  <Provider store={store}>
    <App />
  </Provider>,
  rootElement
)

Hooks#

React Redux provides a pair of custom React hooks that allow your React components to interact with the Redux store.

useSelector reads a value from the store state and subscribes to updates, while useDispatch returns the store's dispatch method to let you dispatch actions.

import React, { useState } from 'react'
import { useSelector, useDispatch } from 'react-redux'
import {
  decrement,
  increment,
  incrementByAmount,
  incrementAsync,
  selectCount
} from './counterSlice'
import styles from './Counter.module.css'

export function Counter() {
  const count = useSelector(selectCount)
  const dispatch = useDispatch()
  const [incrementAmount, setIncrementAmount] = useState('2')

  return (
    <div>
      <div className={styles.row}>
        <button
          className={styles.button}
          aria-label="Increment value"
          onClick={() => dispatch(increment())}
        >
          +
        </button>
        <span className={styles.value}>{count}</span>
        <button
          className={styles.button}
          aria-label="Decrement value"
          onClick={() => dispatch(decrement())}
        >
          -
        </button>
      </div>
      {/* omit additional rendering output here */}
    </div>
  )
}

Help and Discussion#

The #redux channel of the Reactiflux Discord community is our official resource for all questions related to learning and using Redux. Reactiflux is a great place to hang out, ask questions, and learn - come join us!

You can also ask questions on Stack Overflow using the #redux tag.

Docs Translations#

Portuguese