The discussion basically says you don't follow an edit the full program-compile-run cycle like in other languages with batch compilers. Instead, you interactively create a program by writing individual expressions (e.g. function definitions) in the editor, sending them to the REPL for evaluation and testing, further experimenting at the REPL, and repeating the cycle. If you're already familiar with Lisp environments there's nothing new in the book.
pamoroso|2 years ago