Ruby's IRB has always been nice to work with: https://github.com/ruby/irb#commands https://github.com/ruby/irb#commands Of course LISP is the example to look a

Ruby's IRB has always been nice to work with: https://github.com/ruby/irb#commands https://github.com/ruby/irb#commands Of course LISP is the example to look at with REPL: https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop#Lisp_specifics https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93prin... ...esp with Emacs: https://slime.common-lisp.dev/ https://slime.common-lisp.dev/