FAQ: Redux Middleware and Thunks - createAsyncThunk()

This community-built FAQ covers the “createAsyncThunk()” exercise from the lesson “Redux Middleware and Thunks”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Front-End Development
Create an Advanced Web App with React and Redux
Full-Stack Engineer
Front-End Engineer
Front-End Development

Async Actions with Middleware and Thunks
Learn Redux: Middleware and Thunks
Learn Redux

FAQs on the exercise createAsyncThunk()

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The lessons start by using the parameters arg and thunkAPI for the payload creator. There is a brief sentence saying they are not necessary in a particular exercise, but then the hint includes them. There is no mention of when these parameters should be used.

Also, for most of the lessons with the fetchUserById, they use both arg and thunkAPI, then suddenly towards the end when extraReducers is mentioned, thunkAPI disappears as a variable, again with no explanation:

Can anyone help to explain? What exactly is the thunkAPI parameter? How do I know when I need to use that, and when to use the arg?

I came to ask the same questions about using arg and thunkAPI especially because the provided solution uses them.