Editing programs “while they are running”? How?

Question

This question is a corollary to: Editing programs “while they are running”? Why?

I\'m only recently being exposed to the world of Clojure and am fascinated by a few exam

Answer 1

All that is required is:

• the language must have the ability to load new code (eval)
• an abstraction to redirect function/method calls (vars or mutable-namespaces)