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 In this hands-on tutorial/reference, I will be explaining Functor s and all of its major instances:

  GHC  (Glasgow Haskell Compiler )  is the current de-facto standard and the most used Haskell compiler. It is also reputed with having hard to read error messages. This post will aim to explain a few of its errors. It will also (mostly implicitly) aim to show you how explicit type signatures can really help you write better code.