Mastering Functional Programming

The Cats library for purely functional programming

In this section, we will introduce the library that we will be using for purely functional programming in Scala. It encapsulates frequently encountered type classes, implementations of them for frequently encountered effect types, and some effect types as well.

In this section, we will dive deeper into the structure of the library, and we will see how you can use it in practice. We will be following an example of a Monad type class that we discussed in the previous chapters. We will see how this type class is defined in this library and how it is implemented for its data types.