[CharlieDigital]

Agree with zdragnar; this is not traditional DI which is generally focused on injecting objects.

The difference between the two is that when you inject an object, the receiving side must know a potentially large surface area of the object's behavior.

When injecting a function, now the receiving side only needs to know the inputs and outputs of the singular function.

This subtlety is what makes this approach more powerful.

[globular-toast]

I don't see the difference, but I do agree that DI is generally used to mean constructing systems. It's what you do in your main or "bootstrap" part of the program and there are frameworks to do it for you. But really it's the same thing. You're just composing functionality by passing objects (functions are objects) that satisfy an interface. It might be more acceptable to just say it's dependency inversion.