For clarity, are advanced problems something like “write the output of this anonymous function” or does it teach this concept before asking the question? Is this supposed to be adjunct to a more holistic course?

The course leans pretty heavily toward active recall - there are a lot of high quality tutorials out there, so I wanted this one to focus more on maximizing retention instead of serving as a gentle introduction.

That could make some sense. To be clear I don’t think it’s a bad idea, just seems like this is for a very specific type of person.

I think what you're asking about is more along the lines of execute program[0]. It combines both the initial presentation of concepts and the follow on spaced repetition.

[0] https://www.executeprogram.com/