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> - There are no booleans in the language! Conditionals can still succeed or fail, but failure is defined as returning zero values and success is defined as returning one or more values.

This is similar to how Icon works: https://en.m.wikipedia.org/wiki/Icon_(programming_language)

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Yes, I noticed that, too. I used Icon to process a big pile of code at Apple in the late 80s and found it pleasant to work with.

I wish I could upvote comments more than once on HN :-)

This article seems like a nice overview of the pros and cons of the Icon expression evaluation system:

https://tratt.net/laurie/research/pubs/html/tratt__experienc...

Sounds like it's not a million miles away from how Clojure treats `nil` values, either

Or the List monad.

Or Common Lisp.

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