Today, 2025-02-12, at 1930 UTC (11:30 am PST, 2:30 pm EST, 7:30 pm GMT, 20:30 CET, …) we are streaming the 39th episode of the Haskell Unfolder live on YouTube.
The Haskell Unfolder Episode 39: deriving strategies
In this episode we’ll discuss the the four different ways GHC offers for deriving class instance definitions: the classic “stock” deriving, generalised “newtype” deriving, as well as the “anyclass” and “via” strategies. For each of these, we’ll explain the underlying ideas, use cases, and limitations.
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.