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Also, if you decide to go with erlang, I would recommend http://learnyousomeerlang.com/content. It is written by the same guy, two great books.

It's not written by the same guy. Fred Hébert for the Erlang one, Miran Lipovaca for the Haskell one.

Miran Lipovača wrote the haskell book. Frederic Trottier-Hebert wrote the erlang book.