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Why Type Classes

How do you learn a programming language?

  • Books start from basics and build up, and along the way can introduce you to things you might not have known you needed.
  • Good documentation gives a concise summary of how to use something, if you already have the context and know what you’re looking for.

Why not have both? In one place, with consistent style and quality. That’s Type Classes.

Type Classes membership offers a combination of book-like courses and documentation for Haskell features, linked together into a single resource.

Our top-quality courses and documentation include some things that no other Haskell resource does:

And all subscribers receive coupons to download our latest Joy of Haskell monograph, Sockets and Pipes, for free.

Look around
What's new
Seq and complexity
We’ve added a page on Seq and an explanation of the basics of time complexity.
The final Applicative episode
Applicative lesson 11, identity and interchange, is up!
Homomorphism, and Applicative lesson 10
Applicative lesson 10, homomorphism and composition, is now available. As I mentioned yesterday, these lessons have taken a lot …
♥️
Thanks for Type Classes and all you provide to the Haskell community. It’s helped me go from a longtime Haskell “lurker” to someone now using Haskell professionally. – Matt Revelle
a masterclass in documentation … – Craig Dallimore
Really informative courses @typeclasses! Highly recommended to anyone who is interested in FP. The more I read the more I realise I don’t know anything about most things anymore. – @mmgalea
I’m really enjoying @typeclasses. The validation course is a real tour de force that makes Monads easy to understand and really provides the context and justification. – @wennefer
Typeclasses is very good. I didn’t expect I’d learn so much since I already knew Haskell well but there’s lots of interesting nuggets of wisdom around. – Jasper Van der Jeugt