The REPL experience in Clojure is powerful. Calva includes a functional debugger as well and I have to say it all leads to a frictionless experience.

The powers that be have done a great job convincing the layperson that copyright is about protecting artists and not publishers. It’s historically inaccurate and you can discover that copyright law was pushed by publishers who did not want authors keeping second hand manuscripts of works they sold to publishing companies.

Additional reading: https://en.m.wikipedia.org/wiki/Statute_of_Anne