⚡️ 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
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...
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
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
🚀 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
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.
#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
🏷️ #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
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
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.
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...
🚀 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.
Fable 5.22 is out. Since 5.16:
- Opt-in Temporal dates / times for JS
- Implicit conversion to U2..U9
- Cold builds: project cracking 7.7s to 2.3s 🏎️
- Compilation up to 2.9x faster (server GC + JIT tuning) 🎉
- Faster watch: incremental inline exprs
- Many BEAM and Rust fixes
#fsharp #fablecompiler
- Opt-in Temporal dates / times for JS
- Implicit conversion to U2..U9
- Cold builds: project cracking 7.7s to 2.3s 🏎️
- Compilation up to 2.9x faster (server GC + JIT tuning) 🎉
- Faster watch: incremental inline exprs
- Many BEAM and Rust fixes
#fsharp #fablecompiler
October 20, 2026 at 9:11 AM
Fable 5.22 is out. Since 5.16:
- Opt-in Temporal dates / times for JS
- Implicit conversion to U2..U9
- Cold builds: project cracking 7.7s to 2.3s 🏎️
- Compilation up to 2.9x faster (server GC + JIT tuning) 🎉
- Faster watch: incremental inline exprs
- Many BEAM and Rust fixes
#fsharp #fablecompiler
- Opt-in Temporal dates / times for JS
- Implicit conversion to U2..U9
- Cold builds: project cracking 7.7s to 2.3s 🏎️
- Compilation up to 2.9x faster (server GC + JIT tuning) 🎉
- Faster watch: incremental inline exprs
- Many BEAM and Rust fixes
#fsharp #fablecompiler
Today's post in my event sourcing series is a short one showing how fast the value projector is that projects events into a single value representing the current state:
www.planetgeek.ch/2026/10/20/e...
#EventSourcing #fsharp #dotnet
www.planetgeek.ch/2026/10/20/e...
#EventSourcing #fsharp #dotnet
Event Sourcing: Is our Projection Code fast enough?
In this part of my event sourcing series, we take a quick, pun intended, look at how fast the projector we saw in the last post actually runs. The projector gets a list of events as input and…
www.planetgeek.ch
October 20, 2026 at 8:20 AM
Today's post in my event sourcing series is a short one showing how fast the value projector is that projects events into a single value representing the current state:
www.planetgeek.ch/2026/10/20/e...
#EventSourcing #fsharp #dotnet
www.planetgeek.ch/2026/10/20/e...
#EventSourcing #fsharp #dotnet
Try #fsharp #programming and ask AI to help you learn quickly comparing it to some programming language you know. You will quickly see its astounding beauty and expressiveness 👁️👁️ 🦔
October 18, 2026 at 6:08 PM
Try #fsharp #programming and ask AI to help you learn quickly comparing it to some programming language you know. You will quickly see its astounding beauty and expressiveness 👁️👁️ 🦔
A Free .NET Profiler for VS Code: CPU, Memory and Leaks in C# and F#
buff.ly/Et9QscC
#dotnet #vscode #csharp #fsharp #profiler #debugging #devtools
buff.ly/Et9QscC
#dotnet #vscode #csharp #fsharp #profiler #debugging #devtools
A Free .NET Profiler for VS Code: CPU, Memory and Leaks in C# and F#
SharpLsp's profiler attaches to any running .NET process from VS Code, Cursor, Windsurf or VSCodium. Hot lines light up in your code, a flame graph opens beside it, and a live heap timeline ranks…
buff.ly
October 19, 2026 at 6:01 PM
A Free .NET Profiler for VS Code: CPU, Memory and Leaks in C# and F#
buff.ly/Et9QscC
#dotnet #vscode #csharp #fsharp #profiler #debugging #devtools
buff.ly/Et9QscC
#dotnet #vscode #csharp #fsharp #profiler #debugging #devtools
A little #fsharp project: DnsAutoSwitch, a Windows service on .NET 10.
Keeps DNS on AdGuard Home/Pi-hole while it’s available, switches to a fallback when it’s down, then back when it returns. One DNS server at a time.
github.com/giuliohome/D...
Keeps DNS on AdGuard Home/Pi-hole while it’s available, switches to a fallback when it’s down, then back when it returns. One DNS server at a time.
github.com/giuliohome/D...
GitHub - giuliohome/DnsAutoSwitch: Windows service that keeps your LAN DNS on a primary server (AdGuard Home, Pi-hole) while it answers, and on a fallback otherwise. F#, .NET 10.
Windows service that keeps your LAN DNS on a primary server (AdGuard Home, Pi-hole) while it answers, and on a fallback otherwise. F#, .NET 10. - giuliohome/DnsAutoSwitch
github.com
October 21, 2026 at 12:52 PM
A little #fsharp project: DnsAutoSwitch, a Windows service on .NET 10.
Keeps DNS on AdGuard Home/Pi-hole while it’s available, switches to a fallback when it’s down, then back when it returns. One DNS server at a time.
github.com/giuliohome/D...
Keeps DNS on AdGuard Home/Pi-hole while it’s available, switches to a fallback when it’s down, then back when it returns. One DNS server at a time.
github.com/giuliohome/D...
Speaking of Navs, Navs v2.0.0 has been released
Navs is a web inspired router for .NET applications
It is agnostic you can route to your own type (string, Control, Widget, you name it)
Avalonia, Avalonia.FuncUI and Terminal.GUI were also updated.
github.com/AngelMunoz/N...
#dotnet #fsharp
Navs is a web inspired router for .NET applications
It is agnostic you can route to your own type (string, Control, Widget, you name it)
Avalonia, Avalonia.FuncUI and Terminal.GUI were also updated.
github.com/AngelMunoz/N...
#dotnet #fsharp
GitHub - AngelMunoz/Navs: A set of libraries that allow Router-like experiences for general purpose F# Apps
A set of libraries that allow Router-like experiences for general purpose F# Apps - AngelMunoz/Navs
github.com
October 19, 2026 at 2:55 AM
Speaking of Navs, Navs v2.0.0 has been released
Navs is a web inspired router for .NET applications
It is agnostic you can route to your own type (string, Control, Widget, you name it)
Avalonia, Avalonia.FuncUI and Terminal.GUI were also updated.
github.com/AngelMunoz/N...
#dotnet #fsharp
Navs is a web inspired router for .NET applications
It is agnostic you can route to your own type (string, Control, Widget, you name it)
Avalonia, Avalonia.FuncUI and Terminal.GUI were also updated.
github.com/AngelMunoz/N...
#dotnet #fsharp
F# Weekly #42, 2026 - F# 11 RC2 & compiler performance improvements #fsharp sergeytihon.com/2026/10/17/f...
F# Weekly #42, 2026 – F# 11 RC2 & compiler performance improvements
Welcome to F# Weekly, A roundup of F# content from this past week: News F# in .NET 11 RC 2 – Release Notes Performance improvements in the F# 11 compiler Microsoft News Introducing dotnetup: …
sergeytihon.com
October 17, 2026 at 5:33 PM
F# Weekly #42, 2026 - F# 11 RC2 & compiler performance improvements #fsharp sergeytihon.com/2026/10/17/f...
Wow, what is an update: F# in .NET 11 RC 2 #fsharp github.com/dotnet/core/...
October 16, 2026 at 7:31 AM
Wow, what is an update: F# in .NET 11 RC 2 #fsharp github.com/dotnet/core/...