I really enjoyed Yann Esposito’s slides “Category Theory Presentation” which give a relatively simple and artistic introduction to category theory for Haskell programmers. (I like Haskell too.) His slides present the basic definitions of categories, functors, natural transformations, and monads along with working Haskell code.
Here is a fragment of a typical slide.
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John Carmack has some interesting thoughts on Haskell.
http://functionaltalks.org/2013/08/26/johncarmackthoughtsonhaskell/
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