إف شارب

Key facts

Paradigms

Multi-paradigm : functional , imperative , object-oriented , agent-oriented , metaprogramming , reflective , concurrent

Family

ML : Caml : OCaml

Designed by

Don Syme , Microsoft Research

Developer

Microsoft , The F# Software Foundation

First appeared

2005 ; 21 years ago ( 2005 ) , version 1.0

Stable release

10.0 / 11 November 2025 ; 6 months ago ( 11 November 2025 )

Typing discipline

Static , strong , inferred

Os

Cross-platform : .NET framework, Mono

License

MIT

Filename extensions

.fs, .fsi, .fsx, .fsscript

Website

fsharp .org , learn .microsoft .com /en-us /dotnet /fsharp

via Wikipedia infobox

Source code

Link to the source-code README · 7,809 chars · not written by Vinony