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The Haskell Phrasebook is a free quick-start Haskell guide comprised of a sequence of small annotated programs. It provides a cursory overview of selected Haskell features, jumping-off points for further reading, and recommendations to help get you writing programs as soon as possible.
In this lesson we learn about the concept of contravariance, contravariant functors, and the Contravariant typeclass defined in the contravariance package.contravariant on Hackage. Note that as of GHC 8.6.1 release, Data.Functor.Contravariant is included in base! The remaining modules from the contravariant package are not in base. A functor in Haskell is a type constructor along with a lawful imp
Our books start from a few simple concepts and proceeds to a much more advanced topic. These are oriented for motivated beginners who desire a very hands-on, practical approach, but are also suitable for advanced beginners or intermediate Haskell programmers who want more detailed understanding of the particular topic of the book. Finding Success (and Failure) in Haskell: Fall in love with applica
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