> you have to learn man-years worth of category theory No you don't. Most of the most prolific Haskell programmers (Don Stewart, Neil Mitchell, Lennart August

> you have to learn man-years worth of category theory No you don't. Most of the most prolific Haskell programmers (Don Stewart, Neil Mitchell, Lennart Augustsson, probably SPJ himself) would tell you they don't know any category theory.