From sourcecode to step-by-step tutorial: I wanted to advertise the #pxlclock using programming tutorials. So I built this: - AI breaks the #csharp code into steps; thanks @ursenzler.bsky.social - Renders animations - Writes tutorial - Remotion makes the reel Want a video about how I did that?

The 5th and final part of my post series about "to test, or not to test" takes a look at why the shown concepts help with LLMs and concludes the series. www.planetgeek.ch/2026/03/24/t... Do you like these longer topics, or do you prefer short single posts?

🎉 Deedle 4.0.1 is out! The F# data frame library just got a massive update - new packages, new operations, better stats, performance wins, and many long-standing bugs squashed. A huge amount of community-originated requests in one release. Full notes 👇 github.com/fslaborg/Dee... #fsharp #dotnet

Part 4 of my blog post series about "to test, or not to test" is about making manual testing easy, and why it matters: www.planetgeek.ch/2026/03/19/t.... Can you run your system locally and/ or test things quickly, or do you have to wait for a test environment?

In part 3 of my blog post series on "to test or not to test", I take a look at how to recover from a defect if it finds its way into production anyway: www.planetgeek.ch/2026/03/17/t... What are your approaches to recovering easily from a defect?

“It is the next plausible-sounding token predictor's assumptions which get shipped to production” is a present-day twist to @ziobrando.bsky.social's quote: “It is the developer’s assumptions which get shipped to production.” If the original one was worrying, the latter is scary.

Second part of my series on "To test or not to test": What if we weren't allowed to write automated tests? What concepts, approaches, and tools would help us? www.planetgeek.ch/2026/03/12/t...

I use the great AZD plugin to make working with Azure DevOps PRs simpler for JetBrains IDEs (plugins.jetbrains.com/plugin/22319... ). One of its many features is an AI-driven PR review. It gave me many good pointers, but it should sharpen its F# knowledge 😀 1/3 #fsharp #dotnet #JetBrains

To test or not to test? Start of my blog post series about testing and other ways to ensure quality: www.planetgeek.ch/2026/03/10/t...

"We don't need software engineers anymore; AI agents can generate the code from specifications. We only need people who can write a precise specification that can be understood by an agent." What you need is a software engineer, then. #AI #LLMs #Agents

RE#: how we built the world's fastest regex engine in F# iev.ee/blog/resharp... #regex #fsharp

A typical Monday, which is also the first day of the month, is ending for our application for time-tracking and the like. The first two days of every month see higher loads because people close their previous month's accounts. Thanks to Azure, everything scales automatically with load. #Cloud

F# Weekly #9, 2026 - Crunching the Technical Debt with Repo Assist #fsharp sergeytihon.com/2026/03/01/f...

Sketchnote from Wednesday's .NET user group Zentralschweiz meet-up with Glenn F. Henriksen (@henriksen.no) about practical advice to build glorious monoliths: #sketchnote #dotnet #monoliths

I found this view on my way to the .NET user group central Switzerland on my eMTB

My recording "studio" is my kitchen. No regrets — it's the coziest room in the house. Setting things up to film #csharp coding tutorials for the #pxlclock. Write code, run it on the simulator, watch it glow on the real thing. First tutorials dropping soon. Stay tuned!

F# Weekly #8, 2026 - Boosting F# Libraries with Automated Agentic AI #fsharp sergeytihon.com/2026/02/22/f...

#fsharp is awesome , try it out and learn somewhat an #ocaml / ML language too in the process #dotnet . Think outside of the box 📦 > use your own intelligence , Human Intelligence 😇🦔💚🥳🙌 (AI can help). try also Fharp data nuget with json or csv for example and play with .fsx and REPL . Have fun 🤩

Almost ready to ship: deploy C# apps directly to your PXL Clock. Write code, hit deploy, it compiles on the device. Looks familiar? :) Try the free simulator + examples: github.com/SchlenkR/pxl-clock 25% off with code RONALD: pxlclock.com/?ref=RONALD #csharp #pxlclock #fsharp #pixelart

Learn how to write F# computation expressions to simplify code and enhance functionality. Discover tips and best practices for leveraging this powerful feature in your projects. #FSharp #Programming

Given how much we've been sharing our work with the #fsharp community, we thought it worth summarizing this pivotal decision to establish a new language. speakez.tech/blog/reintro...

This week on Friday @dsyme.bsky.social shows us how agentic workflows can continuously improve #fsharp libraries. amplifyingfsharp.io/sessions/202...

I follow what is happening in the AI/LLM/agents space as closely as I can. Lately, it sometimes feels like backstepping into the last millennium: "We need a correct, complete specification so that agents can then implement it." Replace agents with developers, and it sounds like pre-2000. 1/3

I do not fear the rise of superintelligence. I do, however, fear the rise of billionaires, organizations, and world powers who seek to use computing to maximize their power, influence, and control.

Recent situation.

F# Weekly #6, 2026 - FScript & An ode to “Slowly” handcrafted code #fsharp sergeytihon.com/2026/02/07/f...

What is 1+1? Would an AI be broken if it gave an answer other than 2? If you expect "2" you don't really understand how LLMs work. For at least two reasons. virtualgenius.com/blog/what-is...

try F# today folks, it comes for free within #dotnet sdk !Super easy to get started in vscode with Ionide extension or VS/rider , it’s the .NET ocaml great interop with C# in the same solution, use all the nuget packages you already know and love 💕 has scripting .fsx and REPL baked in

"Clean Code" — a timeless truth or a myth we keep telling ourselves? @tastapod.com and me in conversation on the @modernswe.bsky.social channel discussing the origins, limitations and implications of clean code www.youtube.com/watch?v=OjW_...

I got the feedback that the word "slowly" - even with quotes - is a bad choice because writing code manually isn't per se slow. Absolutely true. I even wrote in the post that I think creating business-logic-heavy code is faster to write directly in code than going through a spec and an agent.

An ode to "slowly" handcrafted code www.planetgeek.ch/2026/02/02/a... When I open my social media feeds, it's obvious: the age of writing code with our fingers is ending. LLMs can write code much faster. But was it ever about the speed of code creation? I think not. #LLMs #agents #fsharp

Remember to try #fsharp in 2026 it’s worth it difof.medium.com/how-f-and-fu...

So true: "The wrong duplication is better than the wrong abstraction"

New blog post: "Events as a means of communication" berthon.dev/posts/events...

F# Weekly #3, 2026 - F# event / (un)conference in 2026? #fsharp sergeytihon.com/2026/01/24/f...

The BEST Programmers Use Tests For Engineering Like THIS... | @emilybache.com 📽️ AVAILABLE NOW Watch HERE ➡️ youtu.be/IFrmfN1fxLg

Ri mas com desgosto

One thing that always gets me a while to get used to after not working in #fsharp for a while is the ordering For those not aware, F# reads things in order, both in a module, and the file system. So the entry point for a program must be the last file, and in any module, the entry point is last.

Territorial integrity and sovereignty are fundamental principles of international law. They are essential for Europe and for the international community as a whole.

My latest side project, this takes an MSBuild binlog file and transforms it into a Perfetto trace msbuild-binlog-perfview.pages.dev

It's kind of funny that due to AI/LLMs these days another metric to rate #programming languages on has become "token efficiency". On the bright side - some of the beloved languages like #Clojure, #Ruby, #FSharp and #OCaml fared pretty well due to their expressive and compact syntax.

Why didn't I find this great feature of Rider earlier? It makes initialising records so much easier. And with a quick invocation of Fantomas, the record is reformatted to match our settings regarding { } alignment. We prefer the Aligned option. #fsharp #JetBrainsRider

Wir starten mit der .NET Usergroup am 29. Januar um 18:00 ins 2026 mit einem Rückblick aufs 2025: www.meetup.com/net-usergrou... Und es war nicht nur AI los. #dotnet

I'm preparing a list of software development-related events that happened in 2025 for a year-in-review. What happened in 2025 besides AI, LLMs, and agents? What should I include, in your opinion?

As the saying goes, there are only twelve F# developers in the world. Obviously, they must have multiple jobs, according to this list of companies using F#: github.com/fsprojects/f... By the way, if you use F# and your company is not on the list, please take the time to add it. #fsharp

A bold assumption by Copilot. 🤔 The type of a Message comes from C# and does not support deep equality (before you are confused). #fsharp

Have you ever looked at the impressive results that LLMs get on benchmarks and wondered if these results are everything they seem? If you'd like to learn about how data leakage calls the results we see on LLM performance into question, check out my latest blog post. t-redactyl.io/posts/2025-1...

I'm introducing the URS index as a competitor to the TIOBE index. It's also based on non-scientific methods to produce an ordered list of programming language popularity. The results are in for 2025: 1. F# All other languages were categorised as non-popular. #fsharp #Humor

F# Weekly #2, 2026 - Mibo and WREN Stack #fsharp sergeytihon.com/2026/01/10/f...