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This is really interesting to me. What exactly do you write on the anki cards? I cannot really image learning a haskell abstraction by mere memorization. How can you learn it without actually applying it to a real problem. Often times the hard part is to know when to use which abstraction. How do you learn this using flashcards?

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What you detail is pretty much how you would recognize it. You write out a brief summary of the high level problem, and then ask yourself "which abstraction would you reach for first, absent any other information?"

The latter part is often implied, but it's best to make it explicit. You're trying to build up expert intuition, which means allowing for the fractal nature of software development to mean you might be in the 20% of times where this won't work for you.

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