To convert the provided DVA model to Zustand, we'll break down the process into several steps. We'll start by setting up the Zustand store and then integrate it into the React components. ### Step 1: Set Up Zustand Store First, install Zustand if you haven't already: ```bash npm install zustand ``` Now, let's create a Zustand store that mirrors the DVA model's functionality. #### userStore.js ```javascript import create from 'zustand'; import { fetchUserList, fetchCurrentUser } from './api'; // Ensure these functions are correctly imported const useUserStore = create((set) => ({ list: [], currentUser: {}, saveList: (list) => set({ list }), saveCurrentUser: (currentUser) => set({ currentUser }), fetchList: async () => { const response = await fetchUserList(); set({ list: response.data }); }, fetchCurrentUser: async () => { const response = await fetchCurrentUser(); set({ currentUser: response.data }); }, })); export default useUserStore; ``` ### Step 2: Integrate Zustand Store into React Components Next, we will replace the DVA-specific code in your React components with Zustand's hooks. #### ExampleComponent.js ```javascript import React, { useEffect } from 'react'; import useUserStore from './userStore'; const ExampleComponent = () => { const { list, currentUser, fetchList, fetchCurrentUser } = useUserStore(); useEffect(() => { // This replaces the DVA subscription setup fetchList(); fetchCurrentUser(); }, [fetchList, fetchCurrentUser]); return (

Users

{user.name}

Current User

{currentUser.name}

); }; export default ExampleComponent; ``` ### Step 3: Validate and Test Ensure that all state transitions and side effects are working correctly. You can do this by running your application and verifying that: - The user list is fetched and displayed correctly. - The current user is fetched and displayed correctly. - Any other interactions or UI elements dependent on the `list` or `currentUser` states work as expected. ### Explanation of Conversion Process 1. **State Initialization**: - In DVA, state initialization is done within the `state` property of the model. - In Zustand, we initialize state directly within the `create` function. 2. **Reducers**: - DVA reducers are functions that handle synchronous state updates. - In Zustand, similar functionality is achieved using setter functions within the `create` function. 3. **Effects**: - DVA effects handle asynchronous operations and side effects. - In Zustand, we define async actions directly within the store definition using `async/await`. 4. **Subscriptions**: - DVA subscriptions are used to run side effects on app initialization. - In React with Zustand, we achieve this using `useEffect` in components. By following these steps and explanations, you should be able to transition your state management from DVA to Zustand smoothly while maintaining modularity and readability in your codebase.

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