Haskell Weekly


Issue 305 2022-03-03

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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.


  • Scalable web crawling and scraping. Available on-premises or in the cloud. (ad)

    Isoxya is an extensible data processing system for crawling and scraping the internet. It is written in Haskell for speed and reliability. Isoxya is free, open-source, and packaged as a container. The JSON API is simple to control. Various plugins are available, many also open-source.

  • Failing in Haskell by Jappie Klooster

    Recently I encountered some dubious error handling code. Not only was it failing, it was failing WRONG.

  • Haskell (Almost) Standard Libraries by Alejandro Serrano Mena

    This books walk you through the main “standard” libraries in the ecosystem, with lots of examples to get you started.

  • Seq and complexity by Chris Martin

    Too long we’ve neglected containers! We’re fixing that, starting with a page on Seq.

  • What is a monad morphism (in Haskell)? by Gabriella Gonzalez

    This post briefly explains what a monad morphism is in the context of Haskell, since I wanted a succinct explanation that I could refer to for other posts.


  • Haskell Developer at MLabs (ad)

    We are one of the leading Haskell consultancies in the fintech, blockchain and AI space, with a passion for Haskell and open source software. We are looking for a remote Haskeller to join our team. If you are excited about Haskell and are up for a new challenge, please apply here or visit our website! For any questions please email jobs@mlabs.city.

  • Haskell Software Engineer at Bitnomial (Chicago,IL,US Remote) (ad)

    Bitnomial is looking for Haskell Software Engineers. Bitnomial is a US based, CFTC licensed and regulated bitcoin derivatives exchange, headquartered in Chicago. Bitnomial develops and operates exchange, clearing, and settlement infrastructure for physically settled bitcoin futures and options.

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

In brief

  • Monthly Hask Anything (March 2022)

    This is your opportunity to ask any questions you feel don’t deserve their own threads, no matter how small or simple they might be!

  • PureScript Annual Survey 2022

  • Shae Erisson by The Cofree Coffee Cast

    In which Shae discusses the power of names, doing things that need to be done, organizing EuroHaskell, putting together the Monad Reader, where to get permission to build cool things, and the importance of ignorance.

Show & tell

  • GHCup version by Julian Ospald

    The main motivation of this release is making it compatible with the new binary distribution of HLS, which is upcoming soon and will be a dynamically linked distribution.

Call for participation