Summary  
This chapter explains how to integrate multiple slice reducers into a single Redux store using configureStore, assigning each slice to its own key in the global state.

General domain of usage  
Front-end application state management

When you have multiple slices, you need to combine them in the store.
Redux Toolkit makes this simple.



## Combining Slices

You pass all slice reducers into `configureStore`:

```javascript
import { configureStore } from '@reduxjs/toolkit';
import userReducer from '../features/user/userSlice';
import tasksReducer from '../features/tasks/tasksSlice';

export const store = configureStore({
  reducer: {
    user: userReducer,
    tasks: tasksReducer
  }
});
```


Each slice becomes a key in the global state.

You can access them like this:

* `state.user`;
* `state.tasks`.



This keeps your state structured and predictable. Each part of the app has a clear place in the store.



Tutustu Redux Toolkitiin yhdessä Reactin kanssa ja tehosta tilanhallintataitojasi. Tämä kurssi esittelee kattavasti Redux Toolkitiin, tehokkaan kirjaston tilanhallintaan. Opit yksinkertaistamaan Reduxin käyttöönottoa, selkeyttämään monimutkaista tilalogiikkaa ja luomaan tehokkaita, skaalautuvia React-sovelluksia.

Understand why Redux Toolkit exists and when it becomes useful. Recognize how state complexity grows in real applications and why simple approaches stop scaling.

Install Redux Toolkit and set up the store. Connect Redux to a React application and understand how data flows through the system.

Define state using slices and organize logic clearly. Create reducers, use generated actions, and keep state manageable as the application grows.

Read data from the store using useSelector and update it with useDispatch. Structure state correctly and avoid common mistakes when working with shared data.

Fetch data from APIs using createAsyncThunk. Manage loading and error states and keep the UI in sync with async updates.

Split state into multiple slices and organize files by feature. Combine reducers cleanly and maintain a clear structure as the application grows.

Build a complete application using Redux Toolkit. Implement CRUD features, handle async data, and improve the user experience with loading and error states.

Combining Reducers Cleanly

Combining Slices