jaspervdj (@functional.cafe)

Really excited to announce this! @Alang9g and I have been working on a non-Euclidian puzzle game for a while, and it’s finally ready! Please give it a try and if you like it, please share it on, it’s completely free! sokyokuban.com

I will be speaking about #categorytheoryillustrated at ZuriHac!

ZuriHac 2026 - Registrations are open! ZuriHac is a completely free, three-day grassroots Haskell coding festival co-organized by the Zürich Friends of Haskell and the OST Eastern Switzerland University of Applied Science. zureg.zfoh.ch/register

:D

@_Gafanhoto the usefulness of my side projects does have a steady downward trend lol

@jaspervdj Hakyll was so useful that you had to create something useless? (This is a joke, it’s nothing but a joke, there is only a joke in this tweet)

Excited and horrified to share my latest side project, an esoteric graphical functional language: jaspervdj.be/turnstyle/

@FlavioCorpa @tritlo @HaskellOrg Hakyll typically produces static html, and I don’t think this is possible with just html/css, you need at least some JS to grab the query parameter

@tritlo @HaskellOrg Bikeshedding apart is there not a pure hakyll way of doing this? And handling an asset depending on a query parameter? Should be quite easy instead of doing a JS hack, no? cc: @jaspervdj 👀

Can I add a PR to @HaskellOrg adding this logo if the url matches ?uwu or ?kawaii ? Similar to what React and Vue.js are doing, I think it could be fun 🤩 #haskell

Registration for ZuriHac 2024 is now open! On 8-10 of June, we will host amazing talks from @xnningxie, Alex McLean, Ivan Perez, Mary Sheeran and much more at our beautiful location at @OST_Informatik. More info at: zfoh.ch/zurihac2024/

I'm proud to announce my new book: Soar with Haskell. I've packed 20+ years of programming, teaching and researching Haskell in this book to help you take off.🦅 packtpub.com/product/soar-w… amazon.com/Soar-Haskell-b… #haskell

some pictures of roller shutters from my trip to new york last year

@lanouzhihun @Alang9g Just saw this now. It’s not definitely known, could be Aphrodite or Artemis. More info here: metmuseum.org/art/collection…

@jaspervdj @Alang9g May I ask who the head is?

Really excited to announce this! @Alang9g and I have been working on a non-Euclidian puzzle game for a while, and it’s finally ready! Please give it a try and if you like it, please share it on, it’s completely free! sokyokuban.com

@domenkozar you rock

I believe I fix most of the annoying bugs in Haskell websockets library except for the "not enough bytes" that I still don't have a reliable way to reproduce. If someone does, let me know and I'll fix it!

have been playing with Scheme a bit. people always make fun of the parentheses and I think that's a bit sad because the caadar/caadddr/... stuff is way funnier

added slide transition effects to patat github.com/jaspervdj/pata…

@reibitto @SusanPotter I agree that eg. for `a = Char` it sometimes make sense if you want an optional (but non-empty when specified) string. The semantics are the same but the connotation is different…

@SusanPotter I do this sometimes if I want to make sure the `None` case is handled with care. Like for empty config values. Of course custom ADTs are always welcome too. I especially don't like when empty lists have special meaning like this disaster 😂 twitter.com/reibitto/statu…

Added "proper" support for speaker notes to patat. Pretty happy with how simple the idea is! No need to practice slides anymore, just scribble down some comments and call it a day 😎

wrote a blogpost about using Haskell's laziness to implement a single-pass layout algorithm: jaspervdj.be/posts/2023-07-…

@graninas The latter sucks, and if there’s ad-hominem attacks those should be moderated more heavily, but I don’t feel like this group has the majority. These attacks unfortunately happen everywhere on the internet, so it feels wrong to demonize the Haskell community in this way…

@graninas I dislike the word opponent here—I think we’re all the on the same side, which is strongly-typed FP. Many of the people who disagree with you have brought up valid arguments in a respectful way, and other people have been way less respectful in expressing their opinion.

Writing books for financial gain? Absolutely not! It's a pure dedication and sacrifice of your life. You can't expect to earn a reasonable amount of money from a book unless it becomes a bestseller: 50,000 copies which is a significant achievement. However, within the Haskell community, it's challenging for a book to become a bestseller due to the relatively small number of people involved. The amount of time and effort required for writing a book can't be paid any close to what you would typically earn in an hourly rate at a regular job. You could potentially earn 100 times more for the same amount of time and effort. For example, you could make around $360,000 in three years at a regular job compared to potentially earning $5,000 to $10,000 in royalties after spending the same three years writing a book. The only way to earn a decent income from your book in a small community like Haskell is through self-publishing. However, even then, there is no guarantee that people will buy it. Rare technical books are not primarily about making money for the author. They are mostly about building reputation and serving the community. And it's sad when the community refuses to understand this simple truth and makes obstacles instead of supporting the authors.