Next week I will present the new work on Fable Beam at Oslo F# Meetup 💫 #fsharp #fablecompiler

Release v3.1.0 - Repo Assisted · fsprojects/SwaggerProvider feat: Add IgnoreParseErrors parameter to OpenApiClientProvider (#300) feat: Add SchemaReaderErrors property to OpenApiClientProvider (fixes #160) (#327) fix: include response body in OpenApiExcepti...

First Repo Assisted release of SwaggerProvider is out #fsharp github.com/fsprojects/S... 🎉🤖

The technical debt of the library has now been completely cleared and it is in excellent shape to be a long-standing part of the FsLab suite of packages for F#.

There's room for a more Pandas-direct-equivalent in the F# world, but that's for another day.

Enjoy your data frames! #fsharp

🌈Repo Assist: Crunching the Technical Debt with GitHub Agentic Workflows I have spent the weekend using GitHub Agentic Workflows to make Repo Assist, a generic, all-purpose automated repository assistant for software maintainers. For some repos, some of the time. I craf…

Deedle 4.0.1 was prepared by Don Syme using a mix of human guidance and AI coding assists, including Repo Assist (dsyme.net/2026/02/25/r...)

The excellent design and ultra-clean implementation by @tomasp.net - along with excellent community issue reports - allowed for rapid progress.

🔧 Deedle 4.0.1 fixes a long list of real-world bugs:

DateTime FSI formatting, numeric widening, DelayedSeries range tracking, inexact Lookup on series, Frame.ofRecords for private types, windowSize bounds, Finance.ewmVol...

+SourceLink, benchmark suite, and NUnit 4 / FsCheck 3. Solid foundations.

⚡ I/O and performance in Deedle 4.0.1:

• Frame.ReadCsv now accepts URLs directly
• New typeResolver and encoding parameters for CSV
• CSV writer: repeated-value ToString() now cached

💙 C# developers — Deedle 4.0.1 has you covered too:

New extension methods: WindowWhile, ChunkWhile, PairwiseWith, MapRows, MapCols, ZipInto, ZipAlignInto, ZipInner

F# libraries and C# interop — better together

#dotnet #csharp

📊 Stats module in Deedle 4.0.1:

• Stats.expanding/movingMedian
• Stats.cov, corr - pairwise series covariance & correlation
• Stats.cov/corrMatrix - full matrix for a Frame
• Stats.describe - pandas-style per-column summary

May align with FSharp.Stats in future

📈 Series gets a lot of love too in 4.0.1:

Series.rank/rankWith/ntile, sweepLevel, replaceValue, maskValues/maskAll, diffDate/diffDateOffset, pctChange, filterByMask, before/after/startAt/endAt/between, windowWhileFromEnd, chunkWhileFromEnd

Pandas-style ergonomics, F#-style correctness ✨ #fsharp

🖼️ Deedle 4.0.1 adds a ton of new Frame operations:

Frame.interleave, joinOn, nestRowsBy, compare, rankRowsBy, meltBy, distinctRowsBy, toJson/saveJson, pctChange, filterRowsByMask, iloc, mapColValuesAs, renameCol, indexRowsApply and more.

Feels much more like a complete data toolkit now 🙌

📦 Three new integration packages in Deedle 4.0.1:

• Deedle.Arrow - Apache Arrow / Feather interop, Frame ↔ RecordBatch, IPC I/O
• Deedle.MicrosoftML - ML.NET IDataView integration with vector column support
• Deedle.Excel.Reader - cross-platform xlsx/xls reading

Interopate with data frames!

🎉 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

F# Weekly #8, 2026 – Boosting F# Libraries with Automated Agentic AI Welcome to F# Weekly, A roundup of F# content from this past week: News What’s new in 1.1 | Elmish Land Microsoft News Migrate your Semantic Kernel and AutoGen projects to Microsoft Agent Fra…

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

Release SqlHydra v3.5.0 · JordanMarr/SqlHydra SqlHydra.Query 3.5.0 New Feature: SQL Server Upsert (insertOrUpdateOnUnique) SqlHydra.Query now supports insert-or-update (upsert) for SQL Server via the new insertOrUpdateOnUnique custom operation...

SqlHydra v3.5 released with new query functionality for SQL Server. #fsharp

github.com/JordanMarr/S...

Just joined Bluesky! Senior F# engineer based in Barcelona — 10+ years building production systems with DDD, event sourcing, and Ports & Adapters. Excited to connect with the functional programming community here.
#fsharp #dotnet #functionalprogramming

F# Weekly #9, 2026 – Crunching the Technical Debt with Repo Assist Welcome to F# Weekly, A roundup of F# content from this past week: News Pure-F# training/inference workflow around Qwen3-4B with NVFP4 [Poll] Consider changing the default of fsharp_multiline_brack…

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

Hey #fsharp sky!

We have an upcoming role for a dev working at tradekart.com.

Full-Stack, with strong FE skills. We have some react apps, but will probably be looking to build some stuff in HTMX (or similar tech) in next few months.

DM me for more details, please repost for reach.

Smashing work!

FSharp.Control.AsyncSeq 4.7.0 Asynchronous sequences for F#

Version 4.7.0 of FSharp.Control.AsyncSeq has been published.

www.nuget.org/packages/FSh...

Developed with the help of Repo Assist github.com/githubnext/a...

#fsharp

RE#: how we built the world's fastest regex engine in F# | ian erik varatalu

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

Starting to learn more about functional programming using F#. Definitely off to a challenging start coming from an imperative programming background but going to try to stick with it.
blog.samirparikh.com/2026/03/lear...

#fsharp

The reason F# is so enjoyable for me to write code in, is that the code complexity tends to decrease as I add more features. Better abstractions become discoverable as I go along, and the cost/risk of refactoring is very low. The end result is usually much simpler than I expected.

#fsharp

I made a post on higher order functions in #fsharp to document what I'm learning about functional programming in general and the language in particular. As always, feedback and suggestions welcome!

blog.samirparikh.com/2026/03/high...

Been doing @gleam.run and #fsharp side by side the past few days (porting libs).

Two of the best programming languages I have worked with. And so much you can enrich your knowledge of one with the help of the other.

RFC: How should Fantomas handle lambda expressions that would change semantics on a single line? · Issue #3279 · fsprojects/fantomas RFC: How should Fantomas handle lambda expressions that would change semantics on a single line? Background: how Fantomas works Fantomas is not a "find-and-replace" tool that tweaks whitespace in y...

Hey #fsharp what are your thoughts on github.com/fsprojects/f... ?

GitHub - dbrattli/Fable.Actor: F# Actors for Fable and Beam F# Actors for Fable and Beam. Contribute to dbrattli/Fable.Actor development by creating an account on GitHub.

The start of a cross-platform Actor library for F# / Fable ✨ Works on .NET, Python, JS and ... BEAM. Single process except BEAM where you get multi-process and supervision. Same code runs everywhere 🤩 #fablecompiler #fsharp github.com/dbrattli/Fab...

Suggestion: Add yaml type provider to F# data family? · Issue #1645 · fsprojects/FSharp.Data Probably needs few revisions for modern dotnet and dependant packages? https://fsprojects.github.io/FSharp.Configuration/YamlConfigProvider.html

F# community: "Suggestion: Add yaml type provider to F# data family?" (that's all they write)

Me: "/repo-assist Implement a YamlProvider"

Result within an hour: New type provider with testing, CI passing

github.com/fsprojects/F...

#fsharp

[Repo Assist] Add `dotnet fsdocs convert` command for single-file conversion by github-actions[bot] · Pull Request #1019 · fsprojects/FSharp.Formatting 🤖 This PR was created by Repo Assist, an automated AI assistant. Closes #811 Summary This adds a new convert verb to the fsdocs CLI tool, enabling conversion of a single .md, .fsx, or .ipynb file t...

F# folk, am working with @nojaf.com on a request from Nick Herchey to add support to fsdocs for "fsdocs convert" to easily convert between the nice literate programming formats F# supports - .fsx, .md, .ipynb, .tex

Please take it for a spin and give feedback

github.com/fsprojects/F...

F# folk, with @nojaf.com we've added support for generating llms.txt to the fsdocs tool that's widely used by the F# community.

We'll release it soon but if you have a chance to take it for a spin before please do.

github.com/fsprojects/F...

#fsharp

The wait is over! Fable 5 Release Candidate is officially here.

After a year of hard work from the community, we're bringing you:
✨ .NET 10 & F# 10 support
🐍 A massive Python update (now powered by a Rust core & PyPI!)
🌐 Cleaner JS/TS Pojo bindings

fable.io/blog/2026/20...

#fsharp #fablecompiler