### Reducers vs extraReducers.
Reducers and extraReducers are both important concepts in Redux Toolkit for managing the state of a React application. While they share some similarities, there are also key differences between the two.
#### Reducers.
Reducers in Redux Toolkit are functions that specify how the state of the application should change in response to actions dispatched to the Redux store. They take the current state and an action as arguments, and return the new state based on the action type.
1. **Defining reducers:** To define a reducer in Redux Toolkit, you can use the `createSlice` function, which allows you to define a slice of the state and the reducer functions that will update that slice.
2. **Handling actions:** Reducers are responsible for handling actions and updating the state accordingly. They are typically used to update specific parts of the state in response to user interactions or API calls.
3. **Immutability:** Reducers should always return a new state object, instead of mutating the existing state directly. This ensures that changes to the state are tracked properly by Redux and helps prevent bugs related to mutable state.
#### extraReducers.
extraReducers is a feature introduced in Redux Toolkit that allows you to add additional reducer logic to a slice that was created using `createSlice`. This can be useful for handling actions from other slices or for adding cross-cutting logic to multiple slices.
1. **Extending reducer logic:** With extraReducers, you can extend the reducer logic of a slice without having to modify the original reducer functions. This can make it easier to manage complex state logic and keep related logic together.
2. **Separation of concerns:** By using extraReducers, you can keep the core reducer logic separate from any additional logic that needs to be applied to the slice. This can help improve the organization and maintainability of your Redux code.
3. **Usage:** You can add extraReducers to a slice by passing an object with action types and reducer functions to the `extraReducers` field when calling `createSlice`. This allows you to combine multiple reducer functions into a single slice.
In conclusion, while both reducers and extraReducers are used for managing state in Redux Toolkit, reducers are the core functions that update the state based on actions, while extraReducers provide a way to extend the reducer logic of a slice without modifying the original reducer functions. By understanding the differences between the two, you can effectively manage the state of your React application using Redux Toolkit.
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