F# (pronounced F sharp) is a strongly typed, multi-paradigm programming language that encompasses functional, imperative, and object-oriented programming techniques. F# is most often used as a cross-platform CLI language, but can also be used to generate JavaScript and GPU code.

F# is developed by the F# Software Foundation, Microsoft and open contributors. An open source, cross-platform compiler for F# is available from the F# Software Foundation. F# is also a fully supported language in Visual Studio and Xamarin Studio. Other tools supporting F# development include Mono, MonoDevelop, SharpDevelop, MBrace and WebSharper. Plugins supporting F# exist for a number of widely used editors, most notably the Ionide extension for Atom and Visual Studio Code, as well as integrations for other editors such as Vim, Emacs or Sublime Text.


Representing graphs in F#

An introduction to graphs in F#.
Heavenly Spheres

A kaleidoscope from F# and monads

How categories pervades our thinking and programming.