https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 16 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-16-modern-fsharp-2026-f-sharp-9-dotnet-9-saturn-giraffe-bolero-fable-feliz-elmish-fantomas-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-modern-fsharp-2026-f-sharp-9-dotnet-9-saturn-giraffe-bolero-fable-feliz-elmish-fantomas-deep-dive.en In 2026, F# is no longer "that language Microsoft Research people used because they liked OCaml." F# 9 shipped alongside .NET 9 in November 2024, completing nullable reference types and polishing discriminated unions one more notch. While F# 10 preview cooks on GitHub, the ecosystem quietly hardened: Saturn gives Rails-style full-stack on top of Giraffe, Giraffe wraps ASP.NET Core in a functional style, and Bolero brings React-like F# to Blazor. Fable compiles F# to JavaScript, Feliz wraps React functionally, and Elmish brings the Elm pattern. Avalonia.FuncUI handles desktop, FSharp.Data type providers handle data, and MathNet.Numerics / DiffSharp / TorchSharp + ML.NET handle numerics, autodiff, and ML. Fantomas is the formatter, Paket the alternative package manager, FAKE the build automation, Polyglot Notebooks the Jupyter analog, Donald the SQL helper, FParsec the parser combinator. In Korea F# lives quietly inside .NET enterprise; in Japan companies like ユーザックシステム (Usac System) run it in production. This is a single-page map of the modern F# stack in 2026. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) fsharpf-sharp-9dotnet-9saturngiraffeboleroblazorfablefelizelmishavalonia-funcuifantomaspaketfakepolyglot-notebooksfsharp-datatype-providersmathnet-numericsdiffsharptorchsharpml-netdonaldsuavehopacfparsec2026deep-diveenglish https://www.youngju.dev/blog/culture/2026-05-16-modern-fsharp-2026-f-sharp-9-dotnet-9-saturn-giraffe-bolero-fable-feliz-elmish-fantomas-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-modern-fsharp-2026-f-sharp-9-dotnet-9-saturn-giraffe-bolero-fable-feliz-elmish-fantomas-deep-dive.ja 2026 年の F# はもう「Microsoft Research の OCaml 好きが書いていた言語」ではない。2024 年 11 月、.NET 9 と同時に F# 9 がリリースされ、nullable reference types は完成し、discriminated union はもう一段磨かれた。F# 10 プレビューが GitHub で進む間に、エコシステムは静かに固まった。Saturn が Giraffe の上で Rails 風のフルスタック体験を提供し、Giraffe が ASP.NET Core を関数型でラップし、Bolero が Blazor の上で F# を React のように書かせてくれる。Fable は F# を JavaScript にコンパイルし、Feliz は React を関数型に包み、Elmish は Elm パターンを持ち込んだ。Avalonia.FuncUI はデスクトップを、FSharp.Data の type provider はデータを、MathNet.Numerics / DiffSharp / TorchSharp + ML.NET は数値・自動微分・ML を担う。Fantomas はフォーマッタ、Paket は代替パッケージマネージャ、FAKE はビルド、Polyglot Notebooks はノートブック、Donald は SQL、FParsec はパーサ。韓国では .NET エンタープライズの一角で静かに使われ、日本ではユーザックシステム(Usac) のような会社が本番で動かす。この記事は 2026 年の F# スタックをまるごと一枚に詰め込んだモダン F# 地図だ。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) fsharpf-sharp-9dotnet-9saturngiraffeboleroblazorfablefelizelmishavalonia-funcuifantomaspaketfakepolyglot-notebooksfsharp-datatype-providersmathnet-numericsdiffsharptorchsharpml-netdonaldsuavehopacfparsec2026deep-dive日本語 https://www.youngju.dev/blog/culture/2026-05-16-modern-fsharp-2026-f-sharp-9-dotnet-9-saturn-giraffe-bolero-fable-feliz-elmish-fantomas-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-modern-fsharp-2026-f-sharp-9-dotnet-9-saturn-giraffe-bolero-fable-feliz-elmish-fantomas-deep-dive 2026년의 F#은 더 이상 "Microsoft 연구소 안에서 OCaml을 좋아하는 사람이 쓰던 언어"가 아니다. .NET 9와 함께 2024년 11월에 출시된 F# 9는 nullable reference types를 완성했고 discriminated union을 한 단계 더 다듬었다. F# 10 프리뷰가 GitHub에서 돌아가는 동안 생태계는 조용히 단단해졌다. Saturn이 Giraffe 위에서 Rails 같은 풀스택 경험을 주고, Giraffe가 ASP.NET Core를 함수형으로 감싸며, Bolero가 Blazor 위에서 F#을 React처럼 쓰게 해 준다. Fable이 F#을 JavaScript로 컴파일하고, Feliz가 React를 함수형으로 감싸며, Elmish가 Elm 패턴을 들고 들어왔다. Avalonia.FuncUI는 데스크톱을, FSharp.Data의 type providers는 데이터를, MathNet.Numerics / DiffSharp / TorchSharp + ML.NET은 수치·자동미분·ML을 담당한다. Fantomas는 포매터, Paket은 대안 패키지 매니저, FAKE는 빌드, Polyglot Notebooks는 노트북, Donald는 SQL, FParsec는 파서. 한국에서는 .NET 엔터프라이즈 한쪽에서 조용히 쓰이고, 일본에서는 ユーザックシステム(Usac) 같은 회사가 실제 프로덕션에서 굴린다. 이 글은 그 모든 조각을 한 페이지에 모은 2026년판 모던 F# 지도다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) fsharpf-sharp-9dotnet-9saturngiraffeboleroblazorfablefelizelmishavalonia-funcuifantomaspaketfakepolyglot-notebooksfsharp-datatype-providersmathnet-numericsdiffsharptorchsharpml-netdonaldsuavehopacfparsec2026deep-dive