Boring Haskell

One of my first private projects I wrote with Haskell involved fetching GeoIP information from a remote service. Now, roughly 1.5 years later, I want to come back to that implementation and reflect on it.

Introduction to projections and event sourcing aggregates in Haskell. First I'll give a brief implementation of projections using `foldl` along with an example. After that, I explain my approach of using a simple Monad transformer stack to implement aggregates and make actions composable.