OK, you know your monoids from your monads. You know how to write a terminal application or two. What's next? What are these language extensions that keep being mentioned? How "type-safe" can you really be?
This repository, I hope, will provide some stepping stones. We'll go through extensions one at a time, and build up a richer vocabulary for talking about Haskell programs, and look to move our assertions up into types, where they can be verified at compile time.
I can't make any guarantees as to how quickly this repository will fill up, but I'm looking to publish at least a section per week.
This is a deep dive into GHC extensions, the power that each one gives us, and how we can combine extensions to achieve very strong guarantees at compile-time. This is not based around concepts; there won't be sections on "dependently-typed programming", or "generic programming", though these concepts will turn up throughout as we dig deeper into the extensions.
If you're interested in something more project-based, I absolutely, 1000% recommend The Book of Types, currently being written by Sandy Maguire. It is a fantastic resource, and one on which I already rely when explaining concepts to others.
GADTsFlexibleInstancesKindSignaturesDataKindsRankNTypesTypeFamilies