Presentation

F♯ Training, covering versions 5.0 to 9.0 (2021-2024)

Slides

This git-book is here to supplement training sessions I've conducted using slides located in this repository:

formation-fsharp/en at main · rdeneau/formation-fsharpGitHub

• Written in markdown with marp / marpit

• Outputs available in HTML and PDF files

• The theme can be customized: it's "just" CSS and PNG files.

Author

Romain DENEAU

• Senior Developer F♯ C♯ TypeScript

• Github /rdeneau
• Linked-in romain-deneau
• Twitter/X @DeneauRomain

Why F♯

Answer in a single tweet :

In detail :

• Multi-paradigm language with a strong functional orientation

  • Functional programming (FP) principles: immutability and composition

  • Building blocks: functions and algebraic data types (ADT)

• "Fun" ! Very pleasant to write and read

  • Expressive and concise (not very verbose syntax)

  • Sensitive to indentation → easy to read

  • Strong static typing but it's almost seamless thanks to type inference

• Language entreprise-friendly

  • Runs on the .NET platform → high performance, easy interop with C# projects, .NET ecosystem and libraries

  • Very good tooling: Visual Studio, VsCode, Rider

  • Robust code: predictable and reproducible results (immutability, structural equality, no nulls, exhaustive pattern matching)

  • Interactive programming: check code by evaluating it in the FSI console

  • Narrowed community but strong and friendly

• F♯ compared to other back-end functional languages

  • Its syntax is not hybrid, unlike Scala and Kotlin (mixing OOP and FP)

  • Easier to learn than Haskell or OCaml (but with fewer FP features, partially compensated for by OOP features)

  • Static typing, unlike Closure (and far fewer brackets 😜)

Convention

📍 → concept addressed later, generally with the associated link

💥 → compilation error or runtime exception

🚀 → more advanced chapters

🍔 or 🎲 → Quiz

📜 → Summary

Target audience

C# Developers - .NET SDK installed on your machine Notions in JavaScript/TypeScript can be helpful when we compare the languages

Perform the training yourself

As a F# developer in a .NET team using only C#, feel free to use these materials (both git-book and slides) to train your team.

💡 The theme can be customized: it's "just" CSS and PNG files.

Changelog

2025-05-13

• Dedicated page to cover everything regarding Exceptions

• Misc precisions regarding Asynchronous programming

2025-04-02

• Translation from French