[gfody]

I think the compiled language analog of a REPL is something like LINQPad for C# where you code in the top pane, highlight a snippet to execute, and get the results in the bottom pane. Combined with the more functional-style language features it's very conducive to layering on complexity and analyzing code where you can execute inner layers to see what they do.

[abhirag]

Although LINQpad is awesome, the newer versions of Visual Studio have a C# REPL built in -- (https://github.com/dotnet/roslyn/wiki/C%23-Interactive-Walkt...)