My #FSharp hot-take: Certain things, e.g. implementing a GRPC service, should done in C#. It's possible in F#, but the undifferentiated heavy lifting + boilerplate are no fun at while also battling inherent C# idioms. Call out from the C# to your F# business logic. Interop is nicer than ever in F# 9 - ThreadSky

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amuletofyendor.bsky.social • 2 days ago

My #FSharp hot-take: Certain things, e.g. implementing a GRPC service, should done in C#. It's possible in F#, but the undifferentiated heavy lifting + boilerplate are no fun at while also battling inherent C# idioms. Call out from the C# to your F# business logic. Interop is nicer than ever in F# 9

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dlidstrom.bsky.social•2 days ago

I’ve only tried calling F# from C# as a proof-of-concept. Sure it works but it doesn’t suite me very well. Instead I now ”integrate” them at the database level. Complex logic best done in F#. Website is C#.

amuletofyendor.bsky.social•2 days ago

It helps to add a thin layer of C# interoperability to your F# code. Type extensions, for example, allow you to add a C# veneer to ordinary F# code. These are a bit like extension methods on the type, and you can just point them to your ordinary module functions.

amuletofyendor.bsky.social•2 days ago

Nullable reference types in F# are a huge help too. Only a year ago I had to write something like Unchecked.defaultof to return a null, now I can just use null. (You need to declare the type nullable... we aren't animals!) https://devblogs.microsoft.com/dotnet/nullable-reference-types-in-fsharp-9/

speakezai.bsky.social•2 days ago

Also worth considering https://brandewinder.com/2025/01/08/convert-fsharp-pipeline-into-csharp-fluent-interface/

amuletofyendor.bsky.social•1 day ago

I like the idea, but not the implementation. It could be massively simplified by using a type extension.
(They also used a class instead of a module because they wanted to use method overloading for some of the functions? Use module + a type extension for the overloads 🙂)

jkone27.bsky.social•1 day ago

just as a note, if u have anything generic in your pipeline u should use extension methods in F# (like in C#) as well, https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/type-extensions#extension-methods

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