Anders Hejlsberg's C# 4.0 REPL

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+11 Q:

Anders Hejlsberg's C# 4.0 REPL

During the last 10 minutes of Ander's talk The Future of C# he demonstrates a really cool C# Read-Eval-Print loop which would be a tremendous help in learning the language.

Several .NET4 related downloads are already available: Visual Studio 2010 and .NET Framework 4.0 CTP, Visual Studio 2010 and .NET Framework 4 Training Kit. Do you know what happened to this REPL? Is it somewhere hidden among examples?

I know about mono repl. Please, no alternative solutions.

+9 A:

The REPL demo was part of "what might happen next", i.e. after 4.0; in .NET 5.0 or something similar.

This is not 4.0 functionality, and never has been.

Marc Gravell 2009-07-27 10:29:36

I assumed that he demonstration was in response to this post to a similar technology in Mono: http://tirania.org/blog/archive/2008/Sep-10.html

plinth 2009-07-27 12:56:30

I'm sure that was a contributing factor...

Marc Gravell 2009-07-27 13:07:59

Yes, Mono's repl is quite good (for those who doesn't know it, get mono, then monodir/bin/gsharp or /bin/gsharp). But I miss the ability of adding functions the same way Anders does.

Richard J. Terrell 2009-07-27 18:59:58

As an alternative I am using http://www.sliver.com/dotnet/SnippetCompiler and Mono's REPL currently, but it would be really nice to have a decent C# Repl.

Richard J. Terrell 2009-07-27 19:05:08

+2 A:

Marc's answer is entirely correct, the possibility of a repl or script like c# has been discussed by Eric Lippert in two blog posts:

I would add that, the 2010 CTP does contain an f# repl (not much use for c# but if you were interested in some aspect of the BCL or CLR then it might be sufficient for your needs)

I find that LINQPad makes up for the lack of a REPL in many cases. It would be nice to get it integrated into Visual studio so you could interact with your existing code base more easily though.

ShuggyCoUk 2009-07-27 12:25:56

The hint about F# Interactive is very helpful. I use this often to quickly test out stuff like the Regex classes, networking classes, etc.

Armentage 2010-10-24 17:08:48

+2 A:

It's probably worth mentioning that the Mono project already does have a C# REPL which i tend to use for those small checks you do now and then. Take a look. Also, if I'm testing an idea which I'm uncomfortable Mono is going to handle to well and it's not worth starting a new test project then Snippet Compiler always comes in handy.

Stimul8d 2009-11-26 10:04:25

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Anders Hejlsberg's C# 4.0 REPL

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