https://thestrangeloop.com/sessions/this-is-your-workflow-on-catnip

"Once you get used to working with a REPL, it hurts to go back to the
old write-compile-restart cycle of less fortunate languages. But the
REPL can only take you so far; even if you add tools like Firebug to
inspect and manipulate your application's state, for all practical
purposes the REPL is really just a glorified debugger.

"But suppose you could go further? Suppose that instead of just that
command prompt, you could have your whole IDE embedded in your runtime
environment?"

HMMM. That sounds a bit familiar.

frank