<ul><li>A thunk function is a function created to handle async logic, like calling an API. It takes two arguments dispatch and getState to dispatch actions and have access to the current state if needed.</li><li>Redux Toolkit provides the createAsyncThunk API to generate thunks easily. fetchUserById is the thunk function created here.</li><li>Besides letting you create thunk functions for API calls, createAsyncThunk automatically dispatches actions to track the state of API requests.</li><li>The extraReducers field in our userSlice is used to handle state status changes.</li></ul>

Redux Toolkit: Creating Thunk Functions

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