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For the experienced Scala developer - Daniel Ciocîrlan discusses the Cats Scala library in Cats: Essential Type Class Hierarchy, Explained. The article explains the essential type classes in the Cats library, why we need them, how they’re related and how you should think about them so that you’re not tangled in all the abstractions.
Need a refresh? Be sure to check out part I and part II. Also, be on the look out for part IV which will start looking in detail at the structure of programs as values datatypes, by talking about algebras.
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