I'll always appreciate Lisp for the most powerful REPL in existence of programming languages by a long shot. Name me one programming language that empowers developers to troubleshoot and fix runtime errors with high availability like Lisp does:

• Meh, who cares. Let's continue to run.
• Here's a REPL with the app state at the time of the runtime error. Happy debugging!
• Fix the bug in production inside of the REPL while everything continues to chug along.
• Save the changes to disk and check it into version control.

The REPL in Lisp is so powerful that there's an entirely different approach to developing apps in Lisp. You can, and some do, code everything inside of the REPL. When they're done, they save the file to disk.