.NET 10

F# is less popular, but it’s a first class .Net language with full MS support and integration onto .Net (VM and ecosystem). C# has been tracking F# and aiming for language parity for years (ie all your modern C# devs should be learning the same language facilities). F# is multi-paradigm so C# devs can write idiomatic C# with minor forced changes. And as a .Net language you can always decompile it into C# and keep going from there.

That’s a radically different proposition than, say, raw OCaml and not particularly niche. It also impacts hiring pools differently since competent functional C# devs are viable, but it tends to appeal to a certain calibre of dev.

Moving faster with fewer errors and more talented candidate pool are relevant to repackaged SaaS startups too. Leaves more time for the other stuff and scales better.

don't get me wrong - i want F# features in C#! I like the ecosystem and both languages.

I'm just pointing out that no matter how cool the language is if it doesn't serve business needs(hiring, onboarding ,ease of replacing staff, target market) it won't be picked.

Last I knew, Rider was pretty much the only IDE available for a large codebase when you weren't on Windows. Much love for Ionide, but it was a serious struggle.

Is this any better now?

No still the same.

VS Code with Ionide is okay but has many limitations for example in debugging or lack of support for F# fsi scripts.

If you’re serious about F#, investing in Rider or Visual Studio makes a lot of sense.

Having said that I wrote a Neo4J data extraction tool a few months ago and chose to write it in F#. At one point I observed how funny it was that I was developing in a Microsoft language and yet my dev workstation runs Fedora and my IDE comes from JetBrains and my code is running in kubernetes on a Linux cluster and there is not a sight of a windows machine in this whole pipeline.

I remember the days when the language, linker, compiler, IDE, the GUI components, everything was tied together. If you wanted the next version of VB you had to buy the new version of Visual Studio!

I've worked with a lot of junior devs/graduates on a large F# project, in that context hiring/onboarding for F# hasn't at all been a limiting factor. Ultimately F# is not a particularly difficult language to learn.