Short answer
The code used for the first TryFSharp cut with F # 2, which includes Intellisense support, is available as a code drop . As an example, Rob Pickering created an online editor for Undertone . I suspect that the code used on the current TryFSharp site that uses F # 3 will pop up on time.
TryFSharp uses Silverlight to host the F # compiler in the client browser (F # is written to F #). You can also call an instance of the F # compiler, which runs on the server from the browser on demand, which is the approach adopted by TryFs.Net and Pit .
Longer answer
There are two sides to scripting:
F # already supports editing and executing (.fsx) script files through F # Interactive .
Editing F # Code
There is no shortage of external editors for F # code:
Support for Xamarin Studio, Emacs, and Vim is based on the F # Bindings project, which provides code completion. SharpDevelop uses the open source AvalonEdit and turns on syntax highlighting for F #. You can use AvalonEdit in your own projects, for example, the open source Refunctor project uses it to provide F # editing inside the Reflector.
There are also several new editors for F # on the horizon:
AvalonEdit is a good place to launch the built-in desktop editor. After you have chosen the editor environment, you need to choose between simple syntax highlighting or more complex integration using F # bindings. If you suspect that people will use an external editor, syntax highlighting may be sufficient.
Bring your own editor, probably the easiest place to start, which just stops running.
F # code execution
Parameters for executing F # code:
Compiling a snippet with F # CodeDOM:
open Microsoft.FSharp.Compiler.CodeDom open System.CodeDom.Compiler let compile snippet = use provider = new FSharpCodeProvider() let options = CompilerParameters(GenerateInMemory=true) provider.CompileAssemblyFromSource(options, [|snippet|]) let snippet = """ module Snippet let x = 1 """ let results = compile snippet