I'm very into tight cadence and have a lot of options to choose from, doing most of my "pets" in Racket, Elixir, Picolisp and p5js, but I still sometimes generate a Maven project and start hacking in a unit test because libraries and performance are excellent and sometimes it requires less effort to brute a problem with imperative mutations.

Pharo is an alternative but documentation and libraries just aren't as good, and maybe never will be.