It works a lot better in a proper Lisp, where the REPL and debugger are first-class citizens. In Javascript, you can do it, but it's a dancing bear at best; as

It works a lot better in a proper Lisp, where the REPL and debugger are first-class citizens. In Javascript, you can do it, but it's a dancing bear at best; as you note, the observability is poor to nil without heroic effort, and scalability's a problem too.