Haskell Weekly


Issue 243 2020-12-24

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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.


  • GHC 8.10.3 released by Ben Gamari

    The GHC team is happy to announce the release of GHC 8.10.3.

  • beauty and the bytestring by Norman Liu

    What does Data.ByteString do differently from builtin lists, then?

  • Don’t think, just defunctionalize by Joachim Breitner

    CPS-conversion and defunctionalization can help you to come up with a constant-stack algorithm.

  • How to initialize data from IHP directly to Elm by Lars Lillo Ulvestad

    Generate types, encoders and decoders for Elm automatically in IHP.

  • Improving Haskell (GHC) Error Messages by Marc Scholten

    A good error message should be clear, actionable, and practical. In this aspect GHC could be a lot more user-friendly.

  • lower case haskell by Tony Day

    In noodling around with stan, a wonderful tool developed with obvious care and attention by the talented kowainik troupe, I created hcount, a cheap and cheerful attempt to count symbol usage in Haskell projects.

  • Refactoring using type classes and optics by Fraser Tweedale

    This post is a case study of a refactoring in the jose library demonstrating how type classes help achieve API stability while admitting new use cases.

  • Santa Wrap by Lucas Di Cioccio

    The main goal for this article is to relate how to iterate quickly on a practical one short day project. Secondary goals are to pike your interest about MiniZinc and introduce you a library named minizinc-process.

  • Try.do for recoverable errors in Haskell by Chris Done

    We get a trivial, syntactically-lightweight, way to string possibly-failing actions together, while retaining all the benefits of being an unliftio-able monad.

  • Support Haskell.org by Rebecca Skinner

    This year we’ve continued to support a significant part of the Haskell community infrastructure- including haskell.org, Hackage, Hoogle, and GHC build infrastructure.


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In brief

Show & tell

  • Hetris by Vitor Coimbra de Oliveira

    A guideline compliant (as far as I can tell) Tetris clone made with SDL2.