# Functor

## Practical Cats: Functor and Applicative

In this post, I ’m going to introduce you some useful aspects of Cats library, mostly code snippets and I ’m not going to delve into any theory or mathematics. Hopefully you will use them in your daily codes, resulting in much more simpler and readable code. map using Functor You are already familiar with the prominent map method in Scala. Informally, a functor is any context with a map method.