What kind of projects and applications are you focused on? In my experience, the difficulty in learning—and teaching—"advanced" Haskell topics is less in the topic itself and more in the level of abstraction involved. I know that I struggled with GADTs and even existential types not because of the features themselves but because I had real trouble putting the features into context and understanding how I would use them. Just *why* are those abstractions in particular interesting?

I can recommend some of my personal favorite topics like streaming libraries, FRP, automatic differentiation and the probability monad, but whether that recommendation makes sense depends on how you want to use those topics. Alternatively, if you have some specific things you would want to build with the class, we could suggest topics that fit those goals.

On Wed, Dec 16, 2020, 19:22 Jacques Carette <carette@mcmaster.ca> wrote:

I will be teaching a second Haskell course next semester.  Let's assume that

Introducing functional programming

Getting started with Haskell and GHCi

Basic types and definitions

Designing and writing programs

Data types, tuples and lists

Programming with lists

Defining functions over lists

Playing the game: I/O in Haskell

Reasoning about programs

Generalization: patterns of computation

Higher-order functions

Developing higher-order programs

Overloading, type classes and type checking

Algebraic types


(i.e. the first chapters of Thompson's Haskell: the Craft of Functional Programming book is "beginner, classic Haskell".  The next few chapters, namely

Abstract data types

Lazy programming

Programming with monads

Domain-Specific Languages

Time and space behaviour


would be (re)done at the start of such a second course. The question for cafe is: what else? I will likely cover:
- Typeclassopedia
- finally tagless
- Template Haskell
- Optics
- GADTs
- recursion schemes


I should probably cover parser combinators, pretty-printing, cabal&stack. I know that http://dev.stephendiehl.com/hask/ gives me one heck of a smorgasbord of options, which is kind of a problem.


Things I know I will not cover:
- dependent types (if I was going to do that, I'd switch to Idris/Agda)
- concurrency (don't ask)


Jacques

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