Functional Programming in Scala
by Michael Pilquist, Rúnar Bjarnason, and Paul Chiusano - While this book does not
specifically cover Cats, it is a great introduction to functional
programming in Scala in general and covers some of the abstractions
that can be found in Cats.
Scala with Cats
by Noel Welsh and Dave Gurnell - The aims of this book are two-fold:
to introduce monads, functors, and other functional programming patterns
as a way to structure program design, and to explain how these
concepts are implemented in Cats.
Scala Pet Store
Demonstrates FP techniques while maintaining approachability for people with an OO background. Uses tagless final for the core domain, and popular Typelevel libraries including Cats, Http4s, Circe and Doobie.
Category Theory for Programmers
by Bartosz Milewski is a series
of category theory lectures oriented towards programmers.
The code examples are written in Haskell and C++,
but the course is designed for programmers of any background,
even the ones without a strong maths knowledge.
Easy and efficient data validation with Cats by Daniela Sfregola this talk introduces Cats, and some of its most interesting components for data validation. In particular, we’ll discuss some options to achieve efficient and expressive data validation. We will also argue that, compared to other options in the language, Cats is particularly suited for the task thanks to its easy-to-use data types and more approachable syntax.