[mchaver]

Great work. I've put it on my to read list for this year. I currently use Haskell and OCaml/ReScript (with Emacs!), but I always enjoy reading Lisp books and imagine my self building systems in Lisp and exploring code in the REPL. Could you talk about some of your experiences of building software in Lisp?

[cdegroot]

It's... "different". I think there are two big things going on: one is the fact that "refactoring" never ends, as you can mold the language around your problem. Ultimately that level of expressiveness makes the hard parts of your code more concise, more readable (as the code ends up being closer to the domain at hand), and therefore more maintainable.

The other thing, which it shares with Smalltalk and which I've seen pretty much nowhere else (Erlang comes very close) is the interactivity. You code inside a running system. Yes, other languages have things they call "the REPL", but they can't deal with classes changing shape, reloading code, etc. It makes the coding cycle much shorter, quicker feedback is better feedback, so you end up going faster (and iterating through complex stuff like that macro that will really nail how clean your top level code is will be much more doable)

When I mentor coders, I often talk about malleable code, like the clay on a potter's table. As soon as you stop working it, things start solidifying and your code turns into something unchangeable and brittle. I think Lisp's traits (which I otherwise only found in Smalltalk) help you push back that point, maybe indefinitely.