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Haskell Weekly

Haskell Weekly Issue 520 curates community content including: a post on making code differentiable with a simple switch, a POPL 2026 podcast episode, a Haskell data visualization tutorial covering interactivity and small multiples, a JSON parser walkthrough, a story about building pGenie (a SQL-first Postgres code generator after abandoning ORMs), a deep dive into property-based testing concepts, and a Functor/Foldable typeclass tutorial. Brief items include the first release of hs-wayland-scanner, a GHCup 0.2.0.0 RC enabling arbitrary tool installation, a discussion on GHC STM internals, and a lightweight enumeration-based property testing library. Show & tell highlights Hatter (native Haskell mobile apps for Android/iOS) and Rivulet (a Wayland compositor in Haskell).