From: Kyle Schmitt <kyleaschmitt@...>
Date: 2007-05-08T04:49:04+09:00
Subject: Re: Live Coding in Ruby?

You mean like using IRB?
Seriously, I think you're looking for irb.  It comes with ruby standard.
Just type irb, you'll get a window.  Type code, it'll run immediately.
Mutate your classes, muck with them, run their methods, push and pop
and print them out, etc etc, all live.

I'm almost positive that's what you're looking for

--Kyle