Ahh k. So like Rebol and Red have worked for decades: >> F: func [A][print type? :A print join "Arg: " A] >> F "Foo"

Ahh k. So like Rebol and Red have worked for decades: >> F: func [A][print type? :A print join "Arg: " A] >> F "Foo" string Arg: Foo >> F func [][return "Bar"] function Arg: Bar I really got spoiled learning Rebol as my first language, I'd already internalized a ton of concepts long before they were introduced during school and college. Higher-order functions were the first time I really realized it, I guess here's another to add to the pile. Even knowing this though, that post really is really obtuse. Definitely could have been better written. Basically in these languages, functions don't have a special syntax to be called, like F(), they just get called when used. So usage of a no-argument function is identical to a variable, and what happens depends on its datatype (function, string, whatever). The special :A syntax is to get the value without evaluating it if it is a function.