Haskell Weekly

Welcome to another issue of Haskell Weekly! Haskell is a safe, purely functional programming language with a fast, concurrent runtime. This is a weekly summary of what’s going on in its community.

Featured

• Episode 28: GHC 2021 by Haskell Weekly Podcast

  Does the idea of -XGHC2021 excite you? Cameron Gera and Taylor Fausak work through this proposed set of language extensions.

• Quicksort in Haskell by Alexander Vershilov

  Making beautiful quicksort real with rewriting rules.

• Cellular Automaton in Haskell (II). WireWorld by Claes-Magnus Berg

  When making WireWorld we can reuse large parts (with some trivial changes) of the UI made for the implementation of Conway’s Game of Life.

• Accidentally-Quadratic HashMaps by Jack Kelly

  Unless you’re careful, using foldMap to build HashMaps can take O(n^2) time.

• Handling of Uncaught Exceptions in Haskell by Ivan Gromakovsky

  When your Haskell application’s thread throws an exception that does not get caught, the Haskell runtime system will handle it and print it based on the Show instance.

• Haskell: The Bad Parts, part 1 by Michael Snoyman

  Haskell is a great language with some warts. Ideally, we’d get rid of the warts. Second to that: let’s be honest about the warts and warn people away from them.

• Plucking In, Plucking Out by Matt Parsons

  In The Trouble With Typed Errors, I argue that an error type that is too big is a major problem. But I’ve never really been bothered with an env type that is too big. Why is that?

• Tagged is not a Newtype by Evan Borden

  As learners get deeper into the ecosystem, as they explore more GHC extensions, they find Tagged and DataKinds.

Jobs

• Functional Programmer at Chordify

• Haskell Developer at Cross Compass

• Full-Stack Engineer at Lumi

Trying to hire a Haskell developer? You should advertise with us!

In brief

• The Current Plan for Haskell QUIC by Kazu Yamamoto

  These blog posts motivated me to explain my plan for “Haskell QUIC” to the Haskell community.

• Haskell LSP (bonus: for Vim) by Monique Oliveira

  So you enjoy coding in Haskell. And you heard kids nowadays code using this LSP thingy.

• Haskell Templates: First two templates available by Tom Sydney Kerckhove

  Earlier this month, I wrote a post about validating the idea of selling Haskell templates.

• Overriding Process Handlings and Terminal Colors by Monday Morning Haskell

  For this week’s video blog, we’ll dig in a bit deeper to the process to give the user better information.

• Proposal: Strict sum and product by Théophile Choutri

  I wish to present what is certainly a controversial proposal for the base library: Making the sum and product functions from the base library strict.

Show & tell

• Echoes of Ouroboros

  Echoes of Ouroboros is a 2D puzzle game. Play as a thief who must finish a job … under loopy circumstances!

• OrboROS

  This is a no-engine game based on raw Vulkan SDK and some Haskell libraries I made to load stuff.

Call for participation

• esqueleto: Refactor test suite
• ihp: File uploads should have cloud storage option
• persistent: derivePersistField phantom type support
• wasp: Wasp (CLI) should print its version