Generally a good book, with some puzzling typos, IIRC (a year or so since i read it), he refers to Platform when he shd be referring to GHC
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there's also recent books by Richard Bird and Simon Thompson, and the Haskell School of Music, which was recently discussed:
https://news.ycombinator.com/item?id=9487881
http://www.amazon.com/Thinking-Functionally-Haskell-Richard-...