Chris Myers (@cwmyers) talks us through how REA Group has adopted functional programming in Scala and what role the Free monad has had to play in that process. This experience report is a frank look at the hurdles getting FP into the organisation and shows how a little bit of category theory can go a long way.

He briefly covers the mechanics of the Free monad and the interpreter pattern but largely looks at how a year with the Free monad has allowed REA to make novice teams productive while they learn and embrace FP and Scala.

You can find the talk on YouTube and the slide here and the code on Github.