[foldr]

Short answer: no.

Even the heavy 'category theory' stuff that some Haskellers are fond of is only loosely related to results of any depth in category theory. To really get anything out of category theory, you need to already have quite a broad and deep mathematical knowledge base.

Deepening your knowledge of linear algebra or general computer science concepts would almost certainly be more valuable.

That said, if category theory interests you, why not? I'm just talking about practical value here.