Haskell Programming Language

Committed to a welcoming, vibrant & ﬂourishing #Haskell community!

Here we talk about community updates, software engineering and the joy of programming.

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Last Notes

2026-10-21 11:49:31 UTC

The HLS team is excited to announce the 2.15.0.0 Haskell Language Server release!
https://blog.haskell.org/hls-2-15-0-0/
#Haskell

2026-10-14 15:40:48 UTC

SIMD-accelerated Base64 in #Haskell now!
The base64-2.0 library has been released, supporting SSE3, AVX2, and NEON extensions.
See changes at https://flora.pm/packages/@hackage/base64/2.0/changelog

2026-10-12 20:58:04 UTC

Working on OCaml's CI pipelines, call that OYaml
*post*

2026-10-11 14:14:09 UTC

#MuniHac 2026 is over! Many thanks to the amazing team at
@nprofile…mu8q for organising the event for the 10th consecutive year!
https://cdn.fosstodon.org/media_attachments/files/117/422/686/150/258/431/original/0f21ce39f2692a46.jpeg
https://cdn.fosstodon.org/media_attachments/files/117/422/686/150/604/304/original/be4e02634c26c4db.jpeg

2026-10-02 15:00:09 UTC

The London #Haskell meetup is looking for talk submissions for November, and for meetups early next year.
They're after lightning talks (~15 minutes) and full-length talks (~30 minutes).
How to submit: https://london-haskell.github.io/#submit-a-talk

2026-10-01 19:15:22 UTC

"[ANN] Project Fluent for #Haskell" by the Institute for Digital Autonomy
https://discourse.haskell.org/t/ann-project-fluent-for-haskell/14778

2026-09-28 17:55:47 UTC

In case you missed it: "CloudMicroHaskell: Direct-Style Distributed #Haskell with MicroHs"
https://www.krook.dev/posts/cmh/post.html

2026-09-28 15:20:58 UTC

"Removing GHCJS from Cabal" on the Haskell forum https://discourse.haskell.org/t/removing-ghcjs-from-cabal/14763
#Haskell #JavaScript

2026-09-28 06:53:12 UTC

AmeriHac 2027 announcement https://haskell.foundation/news/2026-09-27/save-the-date-amerihac-2027.html
#Haskell

2026-09-27 22:19:15 UTC

London #Haskell Meetup - October: https://luma.com/aslwdv0g

2026-09-26 10:27:18 UTC

Just published on the #Haskell blog: A deep dive into "Differences between `foldl` and `foldr`"
https://blog.haskell.org/foldl-and-foldr/, originally by Alexis King

2026-09-25 08:27:16 UTC

"Releasing crypton v2.0.0" by Kazu Yamamoto
https://kazu-yamamoto.hatenablog.jp/entry/2026/09/25/110313

2026-09-03 13:53:30 UTC

New Paris Haskell meetup on the 17th of September! Register at https://www.meetup.com/haskell-paris/events/316400728/
#Haskell

2026-09-01 10:02:31 UTC

They're transing the devs with new paradigms, call that Haskell Replacement Therapy

2026-09-01 09:58:01 UTC

These shitposts are human-made, no generative AI is involved in plumbing the depths of madness to find the gems that we post here.

2026-09-01 09:30:36 UTC

Miso: The React framework for #Haskell. Web, mobile, desktop.
https://haskell-miso.org/

2026-08-28 11:34:10 UTC

Hi to all our new followers! You can get started with this wiki page on how to write a Haskell program: https://wiki.haskell.org/index.php?title=How_to_write_a_Haskell_program
#Haskell

2026-08-19 20:10:48 UTC

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Shout out @nprofile…0ew4 for finding this pearl.

2026-08-19 19:55:35 UTC

Do *your* runtime system embed the Eye of Sauron? Yeah, I didn't think so. 💅
#Haskell
https://cdn.fosstodon.org/media_attachments/files/117/123/922/421/460/691/original/b2bc4350fc4e6588.png

2026-08-18 20:53:06 UTC

2026-08-18 Infrastructure Update https://discourse.haskell.org/t/2026-08-18-infrastructure-update/14581

2026-08-17 14:07:15 UTC

London #Haskell Meetup
Thursday 17th of September
Bring your Haskell, or one will be provided to you
Register here: https://luma.com/70s76zly

2026-08-16 09:35:00 UTC

"Can Haskell Become a Great Language for Data Science?" by the one and only @nprofile…5v2z at ZuriHac 2026
https://www.youtube.com/watch?v=WpDVrUdbT2o
#Haskell #DataScience

2026-08-09 20:12:35 UTC

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@nprofile…j290 https://www.youtube.com/watch?v=SPSZrsgP8FE ? :p

2026-08-08 20:02:46 UTC

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@nprofile…j5ce too real

2026-08-07 13:59:36 UTC

Bad news: LLM-powered crawlers are hitting the #Haskell infrastructure pretty hard
Good news: We have a path to resolution https://github.com/lightpanda-io/browser/issues/3156
Ugly news: Not every crawler feels like respecting robots.txt, or preventing itself being used as a stress test engine.

2026-08-07 10:03:29 UTC

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@nprofile…pxx0 Amazing!

2026-08-06 10:51:35 UTC

"How to not write parsers" by Curtis Chin Jen Sem
https://crtschin.com/posts/how-to-not-write-parsers
#Haskell

2026-08-04 18:48:14 UTC

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@nprofile…0y4f Feel free to tweak the CSS and submit a PR with a better width. :) https://github.com/haskell/blog.haskell.org/

2026-08-04 18:20:26 UTC

"A Revised #Haskell 2010 Language Report" by David Binder https://blog.haskell.org/revised-haskell-2010-report/

2026-08-03 17:38:30 UTC

The Seattle #Haskell User Group's August meet will happen on the 22nd of August!
You can register here: https://www.meetup.com/seattle-haskell-meetup-group/events/315883068/

2026-08-03 15:43:35 UTC

"Twenty Years of Pandoc" by John MacFarlane
https://pandoc.org/twenty-years-of-pandoc.html
#Haskell

2026-07-31 12:26:20 UTC

A new and exciting date/time library for #Haskell! – https://flora.pm/packages/@hackage/hodatime

2026-07-31 09:39:43 UTC

Very cool, Joe!

2026-07-28 19:44:44 UTC

On the blog: "Quick tips for fast iteration in #Haskell" by Tom Ellis & Laurent P. René de Cotret
https://blog.haskell.org/quick-tips-for-fast-iteration-in-haskell/

2026-07-26 19:26:09 UTC

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@nprofile…mx55 project-wide build profiles would shed a very interesting light on our dependency trees

2026-07-26 19:25:39 UTC

Well-done Jaro!

2026-07-22 10:03:42 UTC

Very cool!!

2026-07-16 21:49:06 UTC

The second instalment of our series "Haskellers from the trenches" is about Enterprise #Haskell at H-E-B, the Texas grocery chain.
Blog post: https://blog.haskell.org/enterprise-haskell-at-h-e-b/
Discourse: https://discourse.haskell.org/t/enterprise-haskell-at-h-e-b-the-haskell-programming-languages-blog/14421

2026-07-16 11:58:17 UTC

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@nprofile…dgfn Hi! 👋

2026-07-15 18:26:06 UTC

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@nprofile…whz6 This was raised during today's HLS developers meeting, @nprofile…4eu0 is on it!

2026-07-14 07:19:38 UTC

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@nprofile…7kfx it's up now! let us know if you experience any more issues. :)

2026-07-11 07:53:04 UTC

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@nprofile…whz6 Thanks! If you find the time to report it, it would be amazing. :)

2026-07-10 10:15:34 UTC

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@nprofile…whz6 may we ask what it was?

2026-07-09 11:50:17 UTC

"Learn You a Haskell for Great Good" is available as an interactive Sabela notebook on your browser!
https://sabela.datahaskell.com/c/1ea40000
#Haskell

2026-07-02 09:38:32 UTC

Hyperbole 0.7 has been released! The HTMX-inspired framework for interactive web applications now supports multipart file uploads.
https://discourse.haskell.org/t/ann-hyperbole-0-7-multipart-form-file-uploads-immediate-triggers/14341
#Haskell

2026-06-29 09:05:46 UTC

On the #Haskell blog:
"Overview of Haskell security tooling" by Gautier Di Folco
https://discourse.haskell.org/t/overview-of-haskell-security-tooling/14327

2026-06-28 08:31:00 UTC

Incredibly hyped for this book that will doubtlessly give many people principled tools and help them being better engineers! #Haskell #FunctionalProgramming

2026-06-28 08:06:02 UTC

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@nprofile…j5ce woohooo

2026-06-24 19:35:26 UTC

Especially with LLMs, which rewards lines of code as if they held the value in software, we must strive to remove code.
Dead code that cannot be called, redundant code that can be abstracted and not juste duplicated… Scrap the leftovers and residues, in order to have a better foundation on which to build.

2026-06-24 09:33:41 UTC

Throwback to a gem of an article that starts with one of the hardest lines in computer literature:
> “Every line of code is written without reason, maintained out of weakness, and deleted by chance” Jean-Paul Sartre’s Programming in ANSI C.
https://programmingisterrible.com/post/139222674273/write-code-that-is-easy-to-delete-not-easy-to

2026-06-23 11:07:26 UTC

"Add #Haskell VSCode Extension Pack"
https://discourse.haskell.org/t/add-haskell-vscode-extension-pack/14308

2026-06-19 15:36:38 UTC

Haskell ecosystem activities report: March–May 2026
https://www.well-typed.com/blog/2026/06/haskell-ecosystem-report-march-may-2026/
#Haskell

2026-06-16 16:30:51 UTC

When a shiny new version of GHC comes out, it should be easy to upgrade. After all, the new compiler should be more capable than the previous version!
Simon Peyton-Jones explains in details what has been done, what is now possible, and what remains to be done in this quest of Making GHC upgrades easy.
https://blog.haskell.org/making-ghc-upgrades-easy/
#Haskell

2026-06-16 15:49:50 UTC

After becoming a regular contributor to haskell-language-server and even having his Google Summer of Code proposal accepted, Vidit wanted to talk about his experience on approaching Haskell code bases.
“Contributing to Haskell Through a Beginner’s Lens” by Vidit Odedra
https://blog.haskell.org/contributing-to-haskell-through-a-beginner-s-lens/
#Haskell #GSoC

2026-06-12 17:48:35 UTC

Haskell for Elm developers: giving names to stuff (Part 8 - IO), by Flavio Corpa
https://flaviocorpa.com/haskell-for-elm-developers-giving-names-to-stuff-part-8-io.html
#Haskell #Elm

2026-06-10 12:27:35 UTC

Vienna #Haskell Meetup on the 25th of June 2026
https://www.reddit.com/r/haskell/comments/1u1zd36/vienna_haskell_meetup_on_the_25th_of_june_2026/

2026-06-06 20:33:42 UTC

#ZuriHac day 1 is over! Send us your pictures of the event, and happy #Haskell hacking. :)
https://cdn.fosstodon.org/media_attachments/files/116/705/067/358/822/919/original/99fd9445c3425a0a.png

2026-06-04 13:11:03 UTC

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@nprofile…ma3v The smartest thing you can do is ask for help! There are functional programming and Haskell Discord servers, as well as https://discourse.haskell.org and Matrix chatrooms. :)

2026-06-03 14:55:07 UTC

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Reminder that the Ultimate Functional Programming Humble Bundle has great resources to learn Haskell and Domain-Driven Design https://www.humblebundle.com/books/ultimate-functional-programming-pragmatic-programmers-books

2026-06-03 14:52:00 UTC

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@nprofile…pm25 There has never been a better time 😌

2026-06-03 14:51:37 UTC

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@nprofile…kcq6 or what?

2026-06-03 14:50:51 UTC

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@nprofile…7pdg Welcome aboard!

2026-06-03 14:50:46 UTC

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@nprofile…ma3v And the time is now!

2026-06-02 21:34:21 UTC

The past years have seen horrendous attacks towards trans people. We have a duty to protect the most vulnerable members of our communities.
There is no #Haskell without the trans people who have shaped it through the years.
This June is a month of celebrations, but the struggle continues. ✊🏳️‍⚧️λ
https://cdn.fosstodon.org/media_attachments/files/116/682/655/965/174/186/original/5b54c3afc3be0295.png

2026-06-01 12:38:41 UTC

Serokell’s Work on GHC: Dependent Types, Part 5
https://serokell.io/blog/serokell-s-work-on-ghc-dependent-types-part-5
#Haskell #DependentTyples

2026-06-01 12:08:02 UTC

Request For Comments:
H2JVM - A #Haskell Library for writing #JVM Bytecode
https://discourse.haskell.org/t/h2jvm-a-haskell-library-for-writing-jvm-bytecode/14182

2026-05-29 15:20:19 UTC

OpenTelemetry 1.0 release!!
https://discourse.haskell.org/t/ann-opentelemetry-1-0-release/14168
#Haskell

2026-05-25 07:41:19 UTC

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@nprofile…5p8y Congratulations!

2026-05-25 07:40:50 UTC

"Lambda on Lambda: Serverless Haskell on AWS" by Jack Kelly http://jackkelly.name/blog/archives/2026/06/24/lambda_on_lambda_serverless_haskell_on_aws/index.html
#Haskell

2026-05-24 07:29:52 UTC

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@nprofile…udlj
Congratulations!

2026-05-22 18:04:57 UTC

RFC: Sunsetting i386 bindists?
i386 has been a source of pain for a while with musl libc. Should it be retired, or should the bindings switch to glibc and be less portable?
https://discourse.haskell.org/t/rfc-sunsetting-i386/14149
#Haskell

2026-05-20 13:42:27 UTC

Haskell Foundation 2026 Update
https://discourse.haskell.org/t/haskell-foundation-2026-update/14136

2026-05-19 08:29:32 UTC

The Ultimate Functional Programming Humble Bundle features two excellent #Haskell books by Rebecca Skinner
* Effective Haskell
* Haskell Brain Teasers
Check it out! https://www.humblebundle.com/books/ultimate-functional-programming-pragmatic-programmers-books

2026-05-19 08:23:18 UTC

Check out the current job offers for #Haskell jobs on Beyond Tabs:
https://beyond-tabs.com/jobs?filters={%22languages%22:[%22haskell%22],%22countries%22:[],%22remote%22:false,%22query%22:null}

2026-05-14 20:26:04 UTC

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@nprofile…3xgx wooohoooo

2026-05-14 20:24:37 UTC

"linear-locks: locking primitives free of deadlocks"
If you encounter STM's limitations when it comes to lock-free synchronisation, then Linear Haskell-backed locks maybe the solution you want!
https://discourse.haskell.org/t/ann-linear-locks-locking-primitives-free-of-deadlocks/14112
#Haskell

2026-05-13 20:07:55 UTC

hpgsql, a PostgreSQL driver written in pure #Haskell
https://discourse.haskell.org/t/ann-hpgsql-a-pure-haskell-postgresql-driver-no-libpq/14101

2026-05-12 08:50:16 UTC

Amazing work by @nprofile…mx55 to display 3D solids in GHCi with the ratty terminal
#Haskell
https://fosstodon.org/@hungryjoe@functional.cafe/116558182359836348

2026-05-11 15:40:05 UTC

Great book! You shouldn't hesitate to get it!

2026-05-09 17:35:31 UTC

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@nprofile…mysz woohooo

2026-05-08 15:23:12 UTC

"Exception Annotations: Lay of the Land" by Edsko de Vries.
TL;DR: Use ghc 9.12, don’t call throwIO on an argument of type SomeException, and use your own function instead of displayException if you want to see all exception annotations.
https://well-typed.com/blog/2026/05/lay-annotation-land/
#Haskell

2026-05-08 12:45:14 UTC

You can now try MicroHS in the browser! Check it out:
https://augustss.github.io/MicroHs/web-mhs/
Discourse: https://discourse.haskell.org/t/microhs-in-the-browser/14055
#Haskell

2026-05-08 12:32:07 UTC

The Tokyo #Haskell Meetup will happen on the 19th of May with speakers Luite Stegeman and Farhad Mehta
Discourse: https://discourse.haskell.org/t/haskell-meetup-in-tokyo-19-may/14051
Meetup: https://www.meetup.com/tokyo-haskell-meetup/events/314624400

2026-05-08 12:29:07 UTC

The Lambda Nantes Meetup will happen on the 21st of May, with speakers @nprofile…zpy3 and @nprofile…6zga as speakers
https://discourse.haskell.org/t/lambda-nantes-meetup-21-may/14053
#Haskell

2026-05-06 10:01:15 UTC

damn…

2026-05-05 18:13:01 UTC

The #Haskell Paris Spring Meetup will happen on the 27h of May at ENS Ulm.
See the announcement here: https://discourse.haskell.org/t/haskell-paris-meetup/14040
Register here: https://www.meetup.com/fr-FR/haskell-paris/events/314645669

2026-05-05 08:04:46 UTC

Pure Borrow: Linear #Haskell Meets #Rust-Style Borrowing
Announcement post:
https://discourse.haskell.org/t/pure-borrow-linear-haskell-meets-rust-style-borrowing/13975
First release on Hackage: https://discourse.haskell.org/t/ann-pure-borrow-0-0-0-0/14037

2026-05-04 06:48:49 UTC

#Haskell Language Server 2.14 release announcement: https://blog.haskell.org/hls-2-14-0-0/
Quality of life improvements, bug fixes, and what is to expect for this year's Google Summer of Code!

2026-05-03 17:33:39 UTC

A Tale of Two Handles and a Segfault – Adventures in tackling race conditions and flaky tests in HLS by Curtis Chin Jen Sem
https://crtschin.com/posts/a-tale-of-two-handles
#Haskell

2026-04-29 14:20:06 UTC

“Mo' Nad” is actually the nom de plume of Mohammed Nadir, a Moroccan poet from Rabat prolific between 1924 and 1966, year of his death. Jean Bénabou (born in Rabat too) honoured his legacy by suggesting the name during a meeting at Oberwolfach Research Institute for Mathematics.
#MisinfoWednesday

2026-04-27 09:01:30 UTC

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Enough is enough, the infra team has deployed Anubis again in order to help mitigate the maddening load on our services.

2026-04-27 09:00:03 UTC

Maybe there is a nuanced discussion to have about using LLMs to write #Haskell, but it cannot happen before #LLM crawlers stop DDOSing the Haskell Gitlab instance. 😬

2026-04-24 08:15:44 UTC

Shibuya: #Haskell Data Pipelines
https://github.com/shinzui/shibuya

2026-04-23 13:53:42 UTC

Pure Borrow: Linear #Haskell Meets #Rust-Style Borrowing
https://discourse.haskell.org/t/pure-borrow-linear-haskell-meets-rust-style-borrowing/13975

2026-04-14 16:25:43 UTC

Imagine being able to install binary distributions of your favourite #Haskell tools:
$ ghcup install pandoc
$ ghcup install hlint
$ ghcup install fourmolu
$ ghcup install shellcheck
Well, imagine no more! GHCup 0.2.0.0 will bring a new installer DSL to allow third-party projects to maintain their distribution channel! The more feedback the better!
Try it out at https://discourse.haskell.org/t/ann-ghcup-0-2-0-0-rc-or-beta-maybe/13930

2026-04-14 16:22:58 UTC

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@nprofile…sv8k Great, thanks! In the meantime you can take a look at https://wiki.haskell.org/index.php?title=How_to_write_a_Haskell_program#Testing

2026-04-13 08:39:09 UTC

Any appetite in the crowd for "A CTO's Guide to Adopting #Haskell"? If so, there would be things like:
* Observability
* Domain Design
* Just Enough Haskell To Be Dangerous™
* Library recommendations for your HTTP/gRPC/DB needs
What else would you like to see?

2026-04-12 23:32:14 UTC

Anyone knows a good Machine Yearning library in #Haskell?

2026-04-08 06:40:58 UTC

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@nprofile…n753 we're on it, thanks

2026-04-07 16:42:42 UTC

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@nprofile…vkw7
Still looking for a place >_>