Haskell Weekly


Issue 211 2020-05-14

Subscribe now! We'll never send you spam. You can also follow our feed. Read more issues in the archives.

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.


  • Weekly News for Busy Devs by Jakub Chodounsky (ad)

    Programming Digest is a weekly curated newsletter with the five most interesting stories in programming, data, and tech.

  • The doomsday machine by Clément Delafargue

    Ah, the do-notation. Is it good, is it bad; who knows? It’s good for beginners, it’s bad for beginners. It’s considered harmful.

  • Extensions by Kowainik

    The write up provides the rough description of Extensions Technique in the Haskell compiler, therefore, is suitable for everyone even without any prior knowledge of that term.

  • Learning Haskell: Getting Started by Grant Leadbetter

    Join me in the next part of Learning Haskell where we learn about Arithmetic, Functions, Lazy Evaluation and more.

  • Micro C, Part 4: Integrating the LLVM FFI by Joseph Morag

    Here, we’ll get a taste of how to use the ffi bindings in llvm-hs to do the same thing and also to perform stricter checks on our generated llvm code.

  • Option parsing in Haskell, Part 2: A standard approach to settings in Haskell by Tom Sydney Kerckhove

    That post describes how settings should be handled. This post will describe how to do that in Haskell in practice.

  • On PVP + Restrictive Bounds by Matt Parsons

    The following discussion occured on the FPChat Slack. It was pasted into a gist by Emily Pillmore.

  • Reanimate: Swearing at bad documentation by William Yao

    Reanimate’s a fairly recent addition to the Haskell ecosystem and I haven’t seen a lot of discussion about actually using it, so I’d like to chime in with my own experiences with the library.

  • Sockets and Pipes by Type Classes

    Using a handful of everyday Haskell libraries, this book walks through reading the HTTP specification and implementing it to create a web server.

  • The State of Haskell IDEs by Luke Lau

    As many might be aware, the past year has seen a number of significant changes to the ecosystem, with one of the most noticeable ones being the marriage of ghcide and haskell-ide-engine.


  • Interos is Hiring Full Stack Haskell Software Engineers (ad)

    At Interos, we are disrupting the way Fortune 500 companies and government agencies identify and respond to risk within their supply chains. We deliver the data and insights to business leaders that help them identify, visualize and understand the ripple effects that could impact their supply chains, before they happen. Recently funded by Kleiner Perkins and pivoting to an automated solution, Interos is in essence, a start-up SaaS environment.

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

In brief

Show & tell

  • it-has by Dobromir Nikolov

    A Generic implementation of data-has.

  • knit by Philip Kamenarsky

    Ties the knot on data structures that reference each other by unique keys.

  • shake-plus by Daniel Firth

    Re-export of Shake using well-typed paths and ReaderT.

Call for participation