Welcome to the Haskell Interlude. Today, Matti and Mike talk to
Jeffrey Young. Jeff has had a long history of working with Haskell and
on ghc itself. We talk about what makes Haskell so compelling, the
good and bad of highly optimized code and the beauty of
well-modularized code, how to get into compiler development, and how
to benefit from Domain-Driven Design.

Jeff is currently on the job market - if you want to get in touch,
email him at mailto:[email protected].

We are joined by Kathrin Stark, a professor at Heriot-Watt University in Edinburgh. Kathrin works on program verification with proof assistants, so her focus is not exactly on Haskell, but on topics dear to Haskellers' hearts such as interactive theorem provers, writing correct programs, and the activities needed to produce them. We discuss many aspects of proofs and specifications, and the languages involved in the process, as well as verifying and producing provably correct neural networks.

This episode is a deep dive into the evolution of Haskell and functional programming with one of its pioneers, Lennart Augustson. It  reflects on decades of work in language design and compiler implementation. Lennart speaks about his early involvement in the creation of Haskell, shares thoughts on type systems, performance, and the balance between purity and practicality. The conversation ranges from personal history to big-picture views on the evolution of programming languages, with plenty of insight into what makes Haskell both powerful and challenging. A rare opportunity to hear from one of the foundational voices in the functional programming world.

In this Interlude, we’re joined by Jean-Philipe Bernardy, a Senior Lecturer at University of Gothenburg and Chalmers University of Technology. We discuss letting types be your guide, getting into AI to feed yourself, and never testing your programs.

In this episode, we talk to Manuel Chakravarty - specifically, his work on the ghc backend such as data-parallel Haskell and the FFI  and how that work segued into type system design. We also discussed Manuel's perspective on Haskell from the language design of Swift.

Stefan Wehr is a professor at the Offenburg University of Applied Sciences. Before becoming a professor, Stefan worked in industry on a large Haskell codebase - specifically one that's not a compiler and not a blockchain. So of course we talked about using Haskell in large projects, software architecture, modularity, type classes and data modeling and the suppression of sums outside of functional programming, and also about teaching Haskell at his current job.

We sat down with Phil Wadler, one of the most influential folks in the Haskell community, functional programming, and programming languages, responsible for type classes, monads, and much more. We take a stroll down memory lane, starting from Haskell's inception. We talked about the difference between research and Phil's work on impactful industrial projects and standards - specifically XML and the design of generics in Java, as well as Phll's teaching at the University of Edinburgh using Agda.. Phil is a fountain of great ideas and stories, and this conversation could have gone on for hours. As it is, we hope you enjoy the hour that we had as much as we did. 

Today’s guest is Jurriaan Hage. Jurriaan is a professor at Heriot-Watt University in Edinburgh who’s worked with and on Haskell for many years. He’s known for the Helium Haskell compiler, specifically designed for teaching, and he has plenty of other projects related to Haskell, including improvements to the type system, the generation of better error messages, or detection of plagiarism. 

In this episode, we’re joined by Michael Snoyman, author of Yesod, Conduit, Stackage and many other popular Haskell libraries.
We discuss newcomer friendliness, being a Rustacean vs a Haskellasaur, how STM is Haskell’s best feature and how laziness can be a vice.

Mike and Andres speak to Alex McLean who created the TidalCycles system for electronic music - implemented in Haskell of course. We talk about how Alex got into Haskell coming from Perl, how types helped him think about the structure of music and patterns, the architecture and evolution of TidalCycles, about art, community and making space for new ideas, and lots of things in between.