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The author doesn’t mention it in the article but the pattern suggested is inversion of control (IoC) which is one of my favorites. Highly suggest looking into it if you’ve not heard of it.

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Yeah this is the "D"[1] is SOLID [2]. Robert "Uncle Bob" Martin talks about this in his books Clean Code and Clean Architecture. I'd recommend them. Clean Architecture is really good as an audio book.

[1] https://en.wikipedia.org/wiki/Dependency_inversion_principle

[2] https://en.wikipedia.org/wiki/SOLID

I can't see the Dependency Inversion ("Depend on the interface not the implementation") in this?

Think of it like this:

I am in injecting a function that returns a `User` type. That is the interface. I, the function accepting the injected function, don't care how it gets that `User` (that's the implementation). I just care that I am getting a `User`.

Now, knowing that, I can inject any number of function implementations that implement that interface. As long as a `User` gets returned it does not matter how the sausage gets made so to speak.

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