Batching Dispatches in React-Redux 9

Provide an example where multiple dispatch actions are batched together using batch from React-Redux 9 to prevent unnecessary re-renders.

import { useDispatch } from 'react-redux';
import { batch } from 'react-redux';

function MyComponent() {
  const dispatch = useDispatch();

  function updateMultipleStates() {
    batch(() => {
      dispatch({ type: 'INCREMENT' });
      dispatch({ type: 'DECREMENT' });
      // more actions can be dispatched here
    });
  }

  return (
    <button onClick={updateMultipleStates}>Update States</button>
  );
}

This JavaScript code shows a React component using useDispatch hook from React-Redux. The 'batch' function from React-Redux is utilized to group multiple dispatch actions into a single batch to update the state. This prevents unnecessary re-renders that would occur if the actions were dispatched outside of 'batch'. The dispatch actions 'INCREMENT' and 'DECREMENT' are just placeholders for real action types in a typical Redux application.

/* CSS placeholder for potential styling */
button {
  padding: 10px 20px;
  margin: 10px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #0056b3;
}

The accompanying CSS defines the style for the button element in the React component that triggers the batched dispatch actions. It sets the button's padding, margins, background color, text color, border, border-radius, and cursor styles, including a hover effect.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>React Redux Batching Example</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div id="app"></div>
    <!-- React and Redux scripts will be included here -->
    <script src="bundle.js"></script>
</body>
</html>

This HTML code provides the basic structure for the React-Redux application. It includes a 'div' element with an 'app' id where the React application will mount. The 'link' tag is used for including the CSS stylesheet, and a 'script' tag with 'bundle.js' is included at the bottom before the closing body tag to load the compiled JavaScript code.