react-redux

Provider Component

The Provider component makes the Redux store available to any nested components that need to access the Redux store.

{"import { Provider } from 'react-redux';
import { createStore } from 'redux';
import rootReducer from './reducers';
import App from './App';

const store = createStore(rootReducer);

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

connect Function

The connect function connects a React component to the Redux store. It can map state and dispatch to the props of the component.

{"import { connect } from 'react-redux';
import { increment, decrement } from './actionCreators';

function Counter({ count, increment, decrement }) {
  return (
    <div>
      <button onClick={decrement}>-</button>
      <span>{count}</span>
      <button onClick={increment}>+</button>
    </div>
  );
}

const mapStateToProps = state => ({
  count: state.count
});

const mapDispatchToProps = {
  increment,
  decrement
};

export default connect(mapStateToProps, mapDispatchToProps)(Counter);"}

useSelector Hook

The useSelector hook allows you to extract data from the Redux store state, using a selector function.

{"import { useSelector } from 'react-redux';

function MyComponent() {
  const data = useSelector(state => state.data);
  return <div>{data}</div>;
}"}

useDispatch Hook

The useDispatch hook returns a reference to the dispatch function from the Redux store. You can use it to dispatch actions.

{"import { useDispatch } from 'react-redux';
import { myAction } from './actionCreators';

function MyComponent() {
  const dispatch = useDispatch();
  return (
    <button onClick={() => dispatch(myAction())}>Dispatch Action</button>
  );
}"}