[racket] racket repl?

I'm a total beginner, but I've read extensively about Scheme and Lisp. I
was wondering, does the racket repl behave like the CL repl, i.e., can you
do those amazing on-the-fly adding new code tricks I've read about with
Lisp? I read the "Lisp at JPL" article with the amazing feats of repl
daring he describes. As a beginner I can't say why I find this amazing or
even necessary, but I wondered if racket is similar.

Olwe
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