Jordan Marr
@jordanmarr.bsky.social
Spreading the gospel of F#
https://github.com/JordanMarr
https://github.com/JordanMarr
A beautiful F# library for building AI agents on .NET:
• Quotation-based tool discovery
• Pipeline-style agent composition
• Computation expressions for workflows
• Railway-oriented error handling
F# deserves a place in the agent era — and this is my contribution.
#fsharp #dotnet
• Quotation-based tool discovery
• Pipeline-style agent composition
• Computation expressions for workflows
• Railway-oriented error handling
F# deserves a place in the agent era — and this is my contribution.
#fsharp #dotnet
January 5, 2026 at 6:11 AM
SqlHydra v3.2 big release today that builds on yesterday's release! Now includes DB-specific functions for all 5 supported DBs, custom functions, and adds .NET 10 support.
Samples included in the release notes.
github.com/JordanMarr/S... #fsharp
Samples included in the release notes.
github.com/JordanMarr/S... #fsharp
Release SqlHydra v3.2.0 · JordanMarr/SqlHydra
SqlHydra.Query
Built-in SQL Functions
Use SQL functions directly in your queries with full type safety! Each database provider includes a SqlFn type with common functions.
open SqlHydra.Query
open ...
github.com
December 23, 2025 at 7:13 PM
SqlHydra v3.2 big release today that builds on yesterday's release! Now includes DB-specific functions for all 5 supported DBs, custom functions, and adds .NET 10 support.
Samples included in the release notes.
github.com/JordanMarr/S... #fsharp
Samples included in the release notes.
github.com/JordanMarr/S... #fsharp
My FS Advent post for Dec 22, 2025. 🎄✨☕
Thanks to @sergeytihon.com for keeping the F# community buzzing along year after year!
jordanmarr.github.io/fsharp/cloud... #FsAdvent #fsharp
Thanks to @sergeytihon.com for keeping the F# community buzzing along year after year!
jordanmarr.github.io/fsharp/cloud... #FsAdvent #fsharp
Create a Cloudflare Worker in .NET?!
A blog about F#, Fable, and functional programming in .NET
jordanmarr.github.io
December 22, 2025 at 5:38 PM
My FS Advent post for Dec 22, 2025. 🎄✨☕
Thanks to @sergeytihon.com for keeping the F# community buzzing along year after year!
jordanmarr.github.io/fsharp/cloud... #FsAdvent #fsharp
Thanks to @sergeytihon.com for keeping the F# community buzzing along year after year!
jordanmarr.github.io/fsharp/cloud... #FsAdvent #fsharp
Reposted by Jordan Marr
December 22, 2025 at 3:46 PM
t really bothers me having to type in the full tuple return type and predicate function type in C#.
To each their own but #fsharp type inference just makes me happy.
To each their own but #fsharp type inference just makes me happy.
December 10, 2025 at 12:13 AM
t really bothers me having to type in the full tuple return type and predicate function type in C#.
To each their own but #fsharp type inference just makes me happy.
To each their own but #fsharp type inference just makes me happy.
Reposted by Jordan Marr
Fable 4 and Fable 5, both got a new release to make them work with .NET 10 🎉 #fsharp #fablecompiler
November 25, 2025 at 10:19 PM
Fable 4 and Fable 5, both got a new release to make them work with .NET 10 🎉 #fsharp #fablecompiler
Reposted by Jordan Marr
Fable 5.0.0-alpha.15 has been released.
Lot of improvements have been made for TS and Python target.
It also include fixes for Nullable Reference Types hopefully making us closer to an official stable release. Fable 5 is already used in production by some.
#fsharp #fablecompiler
Lot of improvements have been made for TS and Python target.
It also include fixes for Nullable Reference Types hopefully making us closer to an official stable release. Fable 5 is already used in production by some.
#fsharp #fablecompiler
November 19, 2025 at 11:07 AM
Fable 5.0.0-alpha.15 has been released.
Lot of improvements have been made for TS and Python target.
It also include fixes for Nullable Reference Types hopefully making us closer to an official stable release. Fable 5 is already used in production by some.
#fsharp #fablecompiler
Lot of improvements have been made for TS and Python target.
It also include fixes for Nullable Reference Types hopefully making us closer to an official stable release. Fable 5 is already used in production by some.
#fsharp #fablecompiler
Reposted by Jordan Marr
F# 10 makes it possible to use let! .. and! to await two tasks in parallel. This brings back some memories!
November 14, 2025 at 12:13 AM
F# 10 makes it possible to use let! .. and! to await two tasks in parallel. This brings back some memories!
FSharp.SystemCommandLine v2.0 is released, following System.CommandLine out of beta! #fsharp
github.com/JordanMarr/F...
github.com/JordanMarr/F...
GitHub - JordanMarr/FSharp.SystemCommandLine
Contribute to JordanMarr/FSharp.SystemCommandLine development by creating an account on GitHub.
github.com
November 14, 2025 at 10:54 PM
FSharp.SystemCommandLine v2.0 is released, following System.CommandLine out of beta! #fsharp
github.com/JordanMarr/F...
github.com/JordanMarr/F...
SqlBulkTools.FSharp v1.0.0 is released!
github.com/JordanMarr/S...
github.com/JordanMarr/S...
Release v1.0.0 · JordanMarr/SqlBulkTools.FSharp
Changes
SqlBulkTools.FSharp v1.0.0 now uses Microsoft.Data.SqlClient instead of System.Data.SqlClient.
SqlBulkTools.FSharp now relies on a the "fretje.SqlBulkTools" fork since the original package...
github.com
September 28, 2025 at 4:07 PM
SqlBulkTools.FSharp v1.0.0 is released!
github.com/JordanMarr/S...
github.com/JordanMarr/S...
FSharp.SystemComandLine v2.0.0-beta7 is released!
This adapts to API changes in the new System.CommandLine v2.0.0-beta7.
#fsharp
github.com/JordanMarr/F...
This adapts to API changes in the new System.CommandLine v2.0.0-beta7.
#fsharp
github.com/JordanMarr/F...
August 17, 2025 at 3:38 PM
FSharp.SystemComandLine v2.0.0-beta7 is released!
This adapts to API changes in the new System.CommandLine v2.0.0-beta7.
#fsharp
github.com/JordanMarr/F...
This adapts to API changes in the new System.CommandLine v2.0.0-beta7.
#fsharp
github.com/JordanMarr/F...
I just refactored a bunch of tests with large, inline JSON strings to files using the awesome "EasyBuild.FileSystemProvider" type provider by @mangelmaxime.bsky.social. #fsharp
(The JSON strings were using up mah tokens!)
github.com/easybuild-or...
(The JSON strings were using up mah tokens!)
github.com/easybuild-or...
July 15, 2025 at 9:20 PM
I just refactored a bunch of tests with large, inline JSON strings to files using the awesome "EasyBuild.FileSystemProvider" type provider by @mangelmaxime.bsky.social. #fsharp
(The JSON strings were using up mah tokens!)
github.com/easybuild-or...
(The JSON strings were using up mah tokens!)
github.com/easybuild-or...
No matter how many times I do it, I can never remember the sequence of git commands and cryptic arguments needed to sync my commits to an upstream repository over time. This has probably become my most repeated AI chat request.
July 14, 2025 at 7:13 PM
No matter how many times I do it, I can never remember the sequence of git commands and cryptic arguments needed to sync my commits to an upstream repository over time. This has probably become my most repeated AI chat request.
Reposted by Jordan Marr
Look ma' no esbuild, no cdn, and somewhat editor tooling support! (you wouldn't believe how much the tooling "just works" when your dependencies are stored in a "node_modules" directory)
#dotnet #fsharp #webdev #spa #importmaps
#dotnet #fsharp #webdev #spa #importmaps
July 14, 2025 at 4:23 AM
Look ma' no esbuild, no cdn, and somewhat editor tooling support! (you wouldn't believe how much the tooling "just works" when your dependencies are stored in a "node_modules" directory)
#dotnet #fsharp #webdev #spa #importmaps
#dotnet #fsharp #webdev #spa #importmaps
The new `tryParse` fn in FSharp.SystemCommandLine makes it easy to parse any input type using the F# Result type for built-in validation. Perfect for parsing discriminated unions, or... anything. #fsharp
July 13, 2025 at 3:42 AM
The new `tryParse` fn in FSharp.SystemCommandLine makes it easy to parse any input type using the F# Result type for built-in validation. Perfect for parsing discriminated unions, or... anything. #fsharp
FSharp.SystemCommandLine v2.0.0-beta5 is released!
This adapts to the recent overhaul of System.CommandLine v2.0.0-beta5 and also adds some cool new features. 🥳 #fsharp
github.com/JordanMarr/F...
This adapts to the recent overhaul of System.CommandLine v2.0.0-beta5 and also adds some cool new features. 🥳 #fsharp
github.com/JordanMarr/F...
Release v2.0.0-beta5 · JordanMarr/FSharp.SystemCommandLine
This release provides compatibility with the latest System.CommandLine v2.0.0-beta5 rework!
New Input API
Old:
let unzipFile = Input.Argument<FileInfo>("The file to unzip")
let outputDir = Input.Op...
github.com
June 26, 2025 at 4:42 PM
FSharp.SystemCommandLine v2.0.0-beta5 is released!
This adapts to the recent overhaul of System.CommandLine v2.0.0-beta5 and also adds some cool new features. 🥳 #fsharp
github.com/JordanMarr/F...
This adapts to the recent overhaul of System.CommandLine v2.0.0-beta5 and also adds some cool new features. 🥳 #fsharp
github.com/JordanMarr/F...
Reposted by Jordan Marr
F# Weekly #22, 2025 - Ionide with Cursor #fsharp sergeytihon.com/2025/06/01/f...
F# Weekly #22, 2025 – Ionide with Cursor
Welcome to F# Weekly, A roundup of F# content from this past week: News Announcing dotnet run app.cs – A simpler way to start with C# and .NET 10 – .NET Blog Semantic Kernel and Microso…
sergeytihon.com
June 1, 2025 at 12:25 PM
F# Weekly #22, 2025 - Ionide with Cursor #fsharp sergeytihon.com/2025/06/01/f...
Reposted by Jordan Marr
F# Weekly #21, 2025 - Build 2025 & ReSharper in VS Code #fsharp sergeytihon.com/2025/05/24/f...
F# Weekly #21, 2025 – Build 2025 & ReSharper in VS Code
Welcome to F# Weekly, A roundup of F# content from this past week: News ReSharper for Visual Studio Code Announcing TypeScript Native Previews – TypeScript Connect Once, Integrate Anywhere wi…
sergeytihon.com
May 24, 2025 at 10:06 AM
F# Weekly #21, 2025 - Build 2025 & ReSharper in VS Code #fsharp sergeytihon.com/2025/05/24/f...
Reposted by Jordan Marr
Reposted by Jordan Marr
F# Weekly #20, 2025 - .NET 10 Preview 4 & VS 2022 17.14 #fsharp sergeytihon.com/2025/05/17/f...
F# Weekly #20, 2025 – .NET 10 Preview 4 & VS 2022 17.14
Welcome to F# Weekly, A roundup of F# content from this past week: News F# updates in .NET 10 Preview 4 – Release Notes 🎉 Visual Studio 2022 v17.14 is now generally available! – Visual …
sergeytihon.com
May 17, 2025 at 7:07 AM
F# Weekly #20, 2025 - .NET 10 Preview 4 & VS 2022 17.14 #fsharp sergeytihon.com/2025/05/17/f...
Reposted by Jordan Marr
Have a potential #fsharp development job for full time hire. We are an #fsharp, DDD, CQRS, Event Sourcing team and looking to expand. We build Rockwell Automation's cloud backbone capabilities.
Location has some flexibility and we are a hybrid team with part time remote (2 days a week).
Location has some flexibility and we are a hybrid team with part time remote (2 days a week).
May 15, 2025 at 7:14 PM