Haskell Weekly

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.

Featured

• Competitive Programming in Haskell: stacks, queues, and monoidal sliding windows by Brent Yorgey

  Today I want to show you how to solve this problem using one of my favorite competitive programming tricks, which fits beautifully in a functional context. Along the way we’ll also see how to implement simple yet efficient functional queues.

• GHC’s wasm backend now supports Template Haskell and ghci by Cheng Shao

  Two years ago I wrote a blog post to announce that the GHC wasm backend had been merged upstream. I’ve been too lazy to write another blog post about the project since then, but rest assured, the project hasn’t stagnated. A lot of improvements have happened after the initial merge.

• Haskell: A Great Procedural Language by kqr

  This article really, really tried to become a monad i/o tutorial, but I think I stopped it in time. Here, we are going to jump right in and focus on the interesting stuff.

• Haskell For Dilettantes 17: finishing Applicative by Tea Leaves

  Pete finishes the “filtering” function in Applicative, and it makes him feel very dumb.

Jobs

• Senior Software Engineer Paris or Remote (France) by Aletiq

  Aletiq is a Product Lifecycle Management (SaaS) solution for the manufacturing industry. We are 20ish employees based in France, mostly Paris as of today, and recently raised a Seed of 5 millions with Point9 (key SaaS investor).

• Tontine Trust is hiring a Haskell Developer by Milosh

  Tontine Trust is a fintech trust company, specializing in offering lifetime income pensions & trust funds. Our globally patented platform re-introduces a popular, safe alternative type of savings scheme to the world, the fundamental design of which has been endorsed by organizations like the OECD, the EU, the UK, and Canada, providing more sustainable and more rewarding lifetime income trusts for governments, institutions, and savers.

In brief

• Brillo - Painless 2D graphics (fork of gloss) by Adrian Sieber

  I am very excited to announce Brillo, a Haskell package for painless 2D vector graphics, animations, and simulations powered by GLFW and OpenGL.

• Christmas Ornaments based on programming language logos by Joe Warren

  Generated using Haskell & Waterfall CAD.

• New version of indexHaddock by Henry Laxen

  I just updated indexHaddock, which creates a html index of your local haddock files.

• PSA: network > 3.2.2.0 && < 3.2.7.0 leaks memory on every call to getaddrinfo by Andrzej Rybczak

• RE2HS lexer generator by Ulya Trofimovich

  Regular expression compiler re2c now supports Haskell.

Show & tell

• A minimalistic effect system: parameters-fx by Lorenzo Tabacchini

  I’ve been trying for a long time to fix certain problems with implicit parameters without succeeding completely. Even though imperfect, I have a library that addresses at least some of the issues.

• Initial feedback request: DataFrame library by Michael Chavinda

  Exploring the design space and wanted to try out creating a dataframe library that’s meant for more exploratory data analysis. That is where you don’t know the shape of the data beforehand and want to load it up quickly and answer pretty basic questions.

• Parser-regex: A regex library by meooow

  parser-regex is a regex library where regexes are composed together in the style of parser-combinator libraries.

• Tiny-wlhs, a hybrid haskell and C Wayland compositor by Shane Hamilton

  tiny-wlhs began as an experiment to explore Haskell bindings for wlroots. We took the simple tinywl C compositor and turned it into a Haskell-controlled shared library. This approach lets us incrementally port C code to Haskell while keeping a working window manager.

Call for participation

• cryptol: Give clearer error messages about why Cryptol rejects non-Latin-1 Unicode characters
• swarm: Add FromJSONE instances for Value, Env, and related types