My F# Server Is #2 Out of 98 in the $12 Server Challenge
YouTube video by Denis Makes AI useful
www.youtube.com
November 7, 2026 at 11:14 AM
F# Weekly #45, 2026 – F# in the $12 Server Challenge #fsharp sergeytihon.com/2026/11/07/f...
F# Weekly #45, 2026 – F# in the $12 Server Challenge
Welcome to F# Weekly, A roundup of F# content from this past week: News Serde.FS 1.0 is out FSharp.CloudEdge Microsoft News Get Ready for .NET Conf 2026! Help Shape the Future of .NET: Take the 202…
sergeytihon.com
November 7, 2026 at 4:16 PM
F# Weekly #45, 2026 – F# in the $12 Server Challenge #fsharp sergeytihon.com/2026/11/07/f...
We just shipped Core Framework v3 4.0.3 and Analyzers 2.3.0.
This release includes a new analyzer and several bug fixes.
xunit.net/releases/v3/...
xunit.net/releases/ana...
#DotNet #CSharp #FSharp #UnitTest #TDD
This release includes a new analyzer and several bug fixes.
xunit.net/releases/v3/...
xunit.net/releases/ana...
#DotNet #CSharp #FSharp #UnitTest #TDD
Core Framework v3 4.0.3 | xUnit.net
xunit.net
November 9, 2026 at 1:06 AM
We just shipped Core Framework v3 4.0.3 and Analyzers 2.3.0.
This release includes a new analyzer and several bug fixes.
xunit.net/releases/v3/...
xunit.net/releases/ana...
#DotNet #CSharp #FSharp #UnitTest #TDD
This release includes a new analyzer and several bug fixes.
xunit.net/releases/v3/...
xunit.net/releases/ana...
#DotNet #CSharp #FSharp #UnitTest #TDD
📦 Fable 5.27.0 is live!
Featuring cross-backend support for hex conversions, improved file tracking during rebuilds, and a massive set of BCL alignment fixes across JS, TS, Python, and Rust.
Details & release notes: github.com/fable-compil...
#fsharp #fablecompiler
Featuring cross-backend support for hex conversions, improved file tracking during rebuilds, and a massive set of BCL alignment fixes across JS, TS, Python, and Rust.
Details & release notes: github.com/fable-compil...
#fsharp #fablecompiler
Release 5.27.0 · fable-compiler/Fable
🚀 Features
(js/ts/python/dart/rust/beam) Support Convert.ToHexString, ToHexStringLower and FromHexString (#5204) (3a3acf4e)
🐞 Bug Fixes
(all) Recompile when a source file is added or its output ...
github.com
November 9, 2026 at 4:18 PM
📦 Fable 5.27.0 is live!
Featuring cross-backend support for hex conversions, improved file tracking during rebuilds, and a massive set of BCL alignment fixes across JS, TS, Python, and Rust.
Details & release notes: github.com/fable-compil...
#fsharp #fablecompiler
Featuring cross-backend support for hex conversions, improved file tracking during rebuilds, and a massive set of BCL alignment fixes across JS, TS, Python, and Rust.
Details & release notes: github.com/fable-compil...
#fsharp #fablecompiler
lumis_wasm_fsharp 0.26.10 [updated]
Tree-sitter parser and queries for fsharp, compiled to WASM for Lumis
Licenses: MIT
Tree-sitter parser and queries for fsharp, compiled to WASM for Lumis
Licenses: MIT
November 7, 2026 at 3:00 PM
lumis_wasm_fsharp 0.26.10 [updated]
Tree-sitter parser and queries for fsharp, compiled to WASM for Lumis
Licenses: MIT
Tree-sitter parser and queries for fsharp, compiled to WASM for Lumis
Licenses: MIT
Here's a case study on taking #cleflang to places beyond units of measure as designed in #fsharp and #dotnet. We're excited about the developments behind this proof of concept and can't wait to showcase it next year. clef-lang.com/blog/threebo...
ThreeBody and Rational Dimensions
A deep look into the cheat of softening, finite-precision accumulators, and our ThreeBody astrodynamics design
clef-lang.com
November 7, 2026 at 6:45 PM
Here's a case study on taking #cleflang to places beyond units of measure as designed in #fsharp and #dotnet. We're excited about the developments behind this proof of concept and can't wait to showcase it next year. clef-lang.com/blog/threebo...
At yesterday's Agile Unconference in Zurich, during a session, someone said that automated tests are great for AI agents. I replied that we don't automatically test all our code. The commenter was terrified - okay, I exaggerate - and asked how we know that our code works.
#AUZH #fsharp
🧵 1/3
#AUZH #fsharp
🧵 1/3
To test, or not to Test? Part 1 – Why Test? And at what cost?
I wrote code without tests that ran in production without defects, and I wrote buggy code with TDD (Test Driven Development). Time to look back at 35 years of coding and when tests help, and when…
www.planetgeek.ch
November 6, 2026 at 1:52 PM
Serde.FS 1.0 is out 🎉 After 5 months of beta, dogfooded on real projects.
Write one [] interface and get ASP.NET endpoints plus .NET and Fable clients, generated at compile time. No reflection, so it runs under Native AOT.
github.com/serde-fs/Ser...
#fsharp @sergeytihon.com
Write one [
github.com/serde-fs/Ser...
#fsharp @sergeytihon.com
November 2, 2026 at 8:29 PM
Serde.FS 1.0 is out 🎉 After 5 months of beta, dogfooded on real projects.
Write one [] interface and get ASP.NET endpoints plus .NET and Fable clients, generated at compile time. No reflection, so it runs under Native AOT.
github.com/serde-fs/Ser...
#fsharp @sergeytihon.com
Write one [
github.com/serde-fs/Ser...
#fsharp @sergeytihon.com
#fsharp Has anyone looked at github.com/l0ng-ai/open... ? I have downloaded this and so far it's been working fine with #fsharp and #flutter
GitHub - l0ng-ai/openidea: The IDE you know, rebuilt in Rust. IntelliJ IDEA–style keymap, tool windows and search-everywhere in a fast native app: editor, code insight, debugger, Git, terminal, databa...
The IDE you know, rebuilt in Rust. IntelliJ IDEA–style keymap, tool windows and search-everywhere in a fast native app: editor, code insight, debugger, Git, terminal, database and HTTP clients for ...
github.com
November 2, 2026 at 9:52 AM
#fsharp Has anyone looked at github.com/l0ng-ai/open... ? I have downloaded this and so far it's been working fine with #fsharp and #flutter
F# Weekly #44, 2026 – Plotly.NET 6.0, and a new F# Advent Calendar #fsharp sergeytihon.com/2026/11/01/f...
F# Weekly #44, 2026 – Plotly.NET 6.0, and a new F# Advent Calendar
Welcome to F# Weekly, A roundup of F# content from this past week: News F# Advent Calendar in English 2026 Paket support on renovate merged 🎉 Microsoft News Blazor Welcomes Open-Source Contribution…
sergeytihon.com
November 1, 2026 at 4:53 PM
F# Weekly #44, 2026 – Plotly.NET 6.0, and a new F# Advent Calendar #fsharp sergeytihon.com/2026/11/01/f...
My favorite part: let rec loop.
Peaks, log state and retry backoff arrive as arguments; the final call passes their updated values into the next iteration.
Explicit state, constant stack space. That's the F# I wanted. #fsharp
Peaks, log state and retry backoff arrive as arguments; the final call passes their updated values into the next iteration.
Explicit state, constant stack space. That's the F# I wanted. #fsharp
November 9, 2026 at 9:09 PM
My favorite part: let rec loop.
Peaks, log state and retry backoff arrive as arguments; the final call passes their updated values into the next iteration.
Explicit state, constant stack space. That's the F# I wanted. #fsharp
Peaks, log state and retry backoff arrive as arguments; the final call passes their updated values into the next iteration.
Explicit state, constant stack space. That's the F# I wanted. #fsharp
I asked GPT-6 Astra for more idiomatic F#.
Mutable loop state became immutable records + tail recursion, keeping mutation where it helps.
390 checks and 27 behavior comparisons passed. Windows service updated; live metrics verified.
Beautiful code that actually runs. #fsharp
Mutable loop state became immutable records + tail recursion, keeping mutation where it helps.
390 checks and 27 behavior comparisons passed. Windows service updated; live metrics verified.
Beautiful code that actually runs. #fsharp
November 9, 2026 at 8:50 PM
I asked GPT-6 Astra for more idiomatic F#.
Mutable loop state became immutable records + tail recursion, keeping mutation where it helps.
390 checks and 27 behavior comparisons passed. Windows service updated; live metrics verified.
Beautiful code that actually runs. #fsharp
Mutable loop state became immutable records + tail recursion, keeping mutation where it helps.
390 checks and 27 behavior comparisons passed. Windows service updated; live metrics verified.
Beautiful code that actually runs. #fsharp
⚡️ F# Weekly #44
🏷️ #devdigest #dotnet #net #microsoft #ide #visualstudio #fp #fsharp #blazor #web
https://devdigest.today/goto/6747
🏷️ #devdigest #dotnet #net #microsoft #ide #visualstudio #fp #fsharp #blazor #web
https://devdigest.today/goto/6747
F# Weekly #44, 2026 – Plotly.NET 6.0, and a new F# Advent Calendar
Welcome to F# Weekly, A roundup of F# content from this past week: News F# Advent Calendar in English 2026 Paket support on renovate merged 🎉 Microsoft News Blazor Welcomes Open-Source Contribution…
devdigest.today
November 2, 2026 at 1:02 PM
Fun fact, it is generated from LaTeX, using a simple #fsharp tool that I mostly wrote before the AI era (practically a curious historical artifact now!) github.com/tpetricek/to...
tomasp.net/source/longreads/closing/closing.tex at master · tpetricek/tomasp.net
Source code for my web site and blog - yet another remake! - tpetricek/tomasp.net
github.com
November 2, 2026 at 8:48 PM
Fun fact, it is generated from LaTeX, using a simple #fsharp tool that I mostly wrote before the AI era (practically a curious historical artifact now!) github.com/tpetricek/to...
Opus 5.5 caught a bug in my 2023 #fsharp code: prepending with :: in a recursive function, but missing List.rev. Valid types, wrong order.
Does AI’s ability to reason about intent we never formalized mark a paradigm shift?
On this bug: #typechecking 0 — #AI 1.
Does AI’s ability to reason about intent we never formalized mark a paradigm shift?
On this bug: #typechecking 0 — #AI 1.
November 1, 2026 at 2:07 PM
Opus 5.5 caught a bug in my 2023 #fsharp code: prepending with :: in a recursive function, but missing List.rev. Valid types, wrong order.
Does AI’s ability to reason about intent we never formalized mark a paradigm shift?
On this bug: #typechecking 0 — #AI 1.
Does AI’s ability to reason about intent we never formalized mark a paradigm shift?
On this bug: #typechecking 0 — #AI 1.
⚡️ Fable 5.25.0 is out!
14 perf improvements for JS/TS:
• Union hash 36 → 5 ns, 0 alloc
• Dictionary lookup 39 → 30 ns, 0 alloc
• Record hash 15-20% faster
• List ops 15-30% faster
Contributors aligned behavior with .NET. Thanks goswinr, Leo Conforti, cabboose!
#fsharp #fablecompiler
14 perf improvements for JS/TS:
• Union hash 36 → 5 ns, 0 alloc
• Dictionary lookup 39 → 30 ns, 0 alloc
• Record hash 15-20% faster
• List ops 15-30% faster
Contributors aligned behavior with .NET. Thanks goswinr, Leo Conforti, cabboose!
#fsharp #fablecompiler
October 29, 2026 at 7:02 PM
⚡️ Fable 5.25.0 is out!
14 perf improvements for JS/TS:
• Union hash 36 → 5 ns, 0 alloc
• Dictionary lookup 39 → 30 ns, 0 alloc
• Record hash 15-20% faster
• List ops 15-30% faster
Contributors aligned behavior with .NET. Thanks goswinr, Leo Conforti, cabboose!
#fsharp #fablecompiler
14 perf improvements for JS/TS:
• Union hash 36 → 5 ns, 0 alloc
• Dictionary lookup 39 → 30 ns, 0 alloc
• Record hash 15-20% faster
• List ops 15-30% faster
Contributors aligned behavior with .NET. Thanks goswinr, Leo Conforti, cabboose!
#fsharp #fablecompiler
Paket support on renovate merged 🎉 github.com/renovatebot/... #fsharp
Release 44.194.0 · renovatebot/renovate
44.194.0 (2026-10-29) Features managers: add Paket manager support (#37287) (bdf434d), closes #44914
github.com
October 29, 2026 at 1:03 PM
Paket support on renovate merged 🎉 github.com/renovatebot/... #fsharp
For those of you who work with #fsharp and #dotnet and want to have a good @cloudflare-dev.bsky.social experience, FSharp.CloudEdge was just bumped to 0.1.1 with Pi Agents support.
October 29, 2026 at 2:18 PM
For those of you who work with #fsharp and #dotnet and want to have a good @cloudflare-dev.bsky.social experience, FSharp.CloudEdge was just bumped to 0.1.1 with Pi Agents support.
🚀 Free speedups for JS/TS in the next Fable release:
- List operations: up to 3x faster
- Map lookups: ~1.7x faster
Zero code changes needed.
#fsharp #fablecompiler
- List operations: up to 3x faster
- Map lookups: ~1.7x faster
Zero code changes needed.
#fsharp #fablecompiler
October 27, 2026 at 10:55 AM
🚀 Free speedups for JS/TS in the next Fable release:
- List operations: up to 3x faster
- Map lookups: ~1.7x faster
Zero code changes needed.
#fsharp #fablecompiler
- List operations: up to 3x faster
- Map lookups: ~1.7x faster
Zero code changes needed.
#fsharp #fablecompiler
I know you may not care here but in case you do :)
I made a dev-null.sh client in F# and Avalonia
github.com/AngelMunoz/D...
#dotnet #fsharp #avalonia
I made a dev-null.sh client in F# and Avalonia
github.com/AngelMunoz/D...
#dotnet #fsharp #avalonia
Release v0.4.0 · AngelMunoz/DevNull.Client
Added
Client: the app now keeps a log that follows its flows. Every use case — sign-in, session restore, the feeds and threads, posting, the chat's polls and pushes, the image cache, the local fil...
github.com
October 29, 2026 at 3:25 AM
I know you may not care here but in case you do :)
I made a dev-null.sh client in F# and Avalonia
github.com/AngelMunoz/D...
#dotnet #fsharp #avalonia
I made a dev-null.sh client in F# and Avalonia
github.com/AngelMunoz/D...
#dotnet #fsharp #avalonia
🚀 NBomber Studio 0.10.0 is out!
nbomber.com/blog/2026/10...
One of the biggest additions is 𝐓𝐚𝐠𝐬 support. You can now use key-value tags to organize test sessions and load tests, then filter them by the tags you need.
#DotNet #PerformanceTesting #LoadTesting #csharp #fsharp
nbomber.com/blog/2026/10...
One of the biggest additions is 𝐓𝐚𝐠𝐬 support. You can now use key-value tags to organize test sessions and load tests, then filter them by the tags you need.
#DotNet #PerformanceTesting #LoadTesting #csharp #fsharp
October 29, 2026 at 10:34 AM
🚀 NBomber Studio 0.10.0 is out!
nbomber.com/blog/2026/10...
One of the biggest additions is 𝐓𝐚𝐠𝐬 support. You can now use key-value tags to organize test sessions and load tests, then filter them by the tags you need.
#DotNet #PerformanceTesting #LoadTesting #csharp #fsharp
nbomber.com/blog/2026/10...
One of the biggest additions is 𝐓𝐚𝐠𝐬 support. You can now use key-value tags to organize test sessions and load tests, then filter them by the tags you need.
#DotNet #PerformanceTesting #LoadTesting #csharp #fsharp
F# Weekly #43, 2026 –Fable 5.24 and Ionide 8 #fsharp sergeytihon.com/2026/10/25/f...
F# Weekly #43, 2026 –Fable 5.24 and Ionide 8
Welcome to F# Weekly, A roundup of F# content from this past week: Microsoft News Bring Your Own Model to the GitHub Copilot SDK with C# Get Your .NET MAUI App Ready for Xcode 27 Compare today̵…
sergeytihon.com
October 25, 2026 at 7:46 AM
F# Weekly #43, 2026 –Fable 5.24 and Ionide 8 #fsharp sergeytihon.com/2026/10/25/f...
LoZ Drop Fsharp tuning.
October 20, 2026 at 7:31 PM
LoZ Drop Fsharp tuning.