Haskell Weekly


Issue 410 2024-03-07

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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.


  • Episode 44 – José Manuel Calderón Trilla by The Haskell Interlude

    Wouter and Niki interview Jose Calderon, the new Executive Director of the Haskell Foundation. Jose tells why he applied for the job, how he sees the foundation developing over the coming years, and how you can get involved in the Haskell community.

  • Playing with Value Iteration in Haskell by Iago Leal de Freitas

    Today we are going in a similar exploration of Decision Processes, a close cousin to Finite Automata from the not-so-close field of Optimal Control. These are multistage decision problems with the same kind of dynamics as finite automata. Furthermore, we can formulate Value Iteration — one of the usual to optimize them — compactly using the Haskell machinery.

  • Reshape in Hmatrix by Nicolas Audinet de Pieuchon

    The goal of this post is to implement a type-safe reshape function using the Hmatrix Static API.

  • The Haskell Unfolder Episode 21: testing without a reference by Andres Löh, Edsko de Vries

    The best case scenario when testing a piece of software is when we have a reference implementation to compare against. Often however such a reference is not available, begging the question how to test a function if we cannot verify what that function computes exactly. In this episode we will consider how to define properties to verify the implementation of Dijkstra’s shortest path algorithm we discussed in Episode 20; you may wish to watch that episode first, but it’s not required: we will mostly treat the algorithm as a black box for the sake of testing it.

  • The siren song of domain-specific languages by Gabriella Gonzalez

    I’ve seen a lot of engineering teams mistakenly believe that they can author domain-specific languages for less technical users on a budget. In particular they seem to believe that if they create this domain-specific language then the less technical users will be able to thoughtlessly churn out a bunch of code in that language and there won’t be any problem and they can then move onto the next project. This rarely works out in the way that people hope it will.


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In brief

Show & tell

  • Do your taxes with Haskell! by Mario Blazevic

    The last year’s debut of the canadian-income-tax package came rather late in the tax season, because I only realized it was possible when I went to do my own taxes. I had a year to prepare since then, so you can use the just-released version 2023.0 now, 2023 signifying the tax year it’s for. But it’s not only the tax year that’s different!

  • Some data science in Haskell by Emir Uz

    Here is a UK property price model in Haskell. It interpolates the price of a UK house across all time from just public price paid data. It features a fairly large sparse non-linear regression problem solved with a custom implementation of the Adam optimiser (adamax variant), the ad autodiff package and a bit of wrangling in about 55 lines of code.

Call for participation