Haskell Weekly


Issue 331 2022-09-01

Subscribe now! We'll never send you spam. You can also follow us on Twitter or with 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.


  • Building Haskell for Omni OS by James Hobson

    Instead of blowing the dust of a really old solaris build of GHC and building newer and newer versions, the easiest way to bring haskell to a new platform is to cross compile.

  • Cognitive Loads in Programming by Robert Peszek

    This long post presents programming in a different light than what is commonly considered. We will look at cognitive aspects of interacting with code.

  • Dijkstra with Type Families by Monday Morning Haskell

    This is a perfectly valid implementation, but I wanted to go one step further and try out a different approach to generalization.

  • Haskell in Production: Mercury by Gints Dreimanis

    Our today’s guest is Max Tagher. He’s the co-founder and CTO of Mercury, a company that provides banking products to startups. Read further to learn where Mercury uses Haskell, why they chose it, and what they like about it.

  • How to make a Haskell program 5x faster with 16 lines of code (video) by Alexis King

    In this video, she presents “one example of optimizing a Haskell program in some particular way that really focuses on a particular approach — which, in this particular example, is going to involve looking at GHC core.”

  • Incrementally package a Haskell program using Nix by Gabriella Gonzalez

    This post walks through how to take a standalone Haskell file and progressively package the file using Nix. In other words, we will tour a spectrum of packaging options ranging from simple to fancy.

  • Types for top-level definitions by Brent Yorgey

    I’ve come up with idea for a type system for first-class (global) definitions, which can serve as a very lightweight alternative to a proper module system.


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

Show & tell

  • aeson-dependent-sum by Jack Kelly

    These wrappers are helpful when parsing JSON objects where certain keys determine the type of the deserialised value.

  • hegg by Rodrigo Mesquita

    hegg stands for haskell e-graphs good, and it’s a library featuring e-graphs (a data structure that efficiently represents a congruence relation over many expressions) and a high level API for equality saturation (an optimization/term-rewriting technique).

  • Hero

    I wanted to use an ECS system in Haskell and I have found apecs and ecstasy. However, both seem to use IntMap for storing component data, so I figured that performance could not be all that great.

  • IHP version 0.20 by Marc Scholten

    A new IHP release, containing bug fixes and productivity improvements to existing features.

  • purescript-backend-optimizer by Arista Networks

    An optimizing backend toolkit and modern ECMASCript backend for PureScript.

Call for participation