Devine Lu Linvegan on Nostr: Yeah, it looks funny because it's a concatenative language, but function application ...

Yeah, it looks funny because it's a concatenative language, but function application happens on an unordered bag, so [a b] and [b a] means the same, application happens in parallel, and is applied at once. Before application, the register values are frozen in time, so x takes the value of y, y the value of x, before the fraction is applied.