What the Functor? | Functors in Scala | Rock the JVM

An introduction to functors in Scala, demonstrating how to generalize APIs and map over data structures using the Cats library.

Written version: blog.rockthejvm.com/what-the-functor/ Scala & Cats course: rockthejvm.com/p/cats Links from the video: Type classes: youtube.com/watch?v=bupBZKJT0EA Scala 3 Given/Using: youtube.com/watch?v=vpL-JPHt9qw Monads intro: youtube.com/watch?v=d-dy1x33moA This is a video primarily for Scala folks, but it transfers to other languages e.g. Java, TypeScript, C++ or other typed languages. In this video we'll explore functors, a critical piece of abstract functional programming. Rather than explaining the theory behind it, we go through a concrete use-case of generalizing an API that would otherwise be terribly bloated and repeated. We show how functors work, how they represent the transferable concept of a "mappable" structure and how we can put them in practice and attach a functor to data structures which are mappable, but don't have a standard map method. Follow Rock the JVM on: LinkedIn: linkedin.com/company/rockthejvm Twitter: twitter.com/rockthejvm Blog: rockthejvm.com/blog ------------------------------------------------------------------------- Home: rockthejvm.com -------------------------------------------------------------------------