“Learn You A Haskell For Great Good” is a nice book with a weird title written by Miran Lipovača. It gently introduces you to functional programming with the Haskell programming language and manages to cover a surprising amount of ground without being intimidating. The author and his publisher have very kindly made the entire book available for free on-line. I think it is a great resource to start learning Haskell, but by itself it is unfortunately not enough to become proficient.
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[2015-01-05] “Learn You A Haskell For Great Good”