Today, 2025-03-16, at 1930 UTC (12:30 pm PST, 3:30 pm EST, 7:30 pm GMT, 20:30 CET, …) we are streaming the 41th episode of the Haskell Unfolder live on YouTube.
The Haskell Unfolder Episode 41: generic monoids
Generic functions are a powerful tool that allows us to make more type classes derivable. In this episode, we’ll look at a simple example, namely deriving Monoid instances for product types, using both GHC’s built-in generics and the generics-sop library.
About the Haskell Unfolder
The Haskell Unfolder is a YouTube series about all things Haskell hosted by Edsko de Vries and Andres Löh, with episodes appearing approximately every two weeks. All episodes are live-streamed, and we try to respond to audience questions. All episodes are also available as recordings afterwards.
We have a GitHub repository with code samples from the episodes.
And we have a public Google calendar (also available as ICal) listing the planned schedule.
There’s now also a web shop where you can buy t-shirts and mugs (and potentially in the future other items) with the Haskell Unfolder logo.