Yes, it's either an array (if A, B and C are arrays), a function derived via the dyadic operator B, with operands A and C being either arrays or functions, a dyadic function call of the dyadic function B (A and C are arrays), or the sequential monadic application of functions A and B to array C, or a derived function as the tacit fork (A, B and C are functions). Did I miss anything?

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abrudz 2 hours ago | parent | next [-]

Yes, it can also a fork where A is an array while B and C are function and a tacit atop where either B is a monadic operator and A its array or function operand or A is a function and C is a monadic operator with B being its array or function operand. Finally, it can be a single derived function where B and C are monadic operators while A is B's array or function operand.

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boxed 2 hours ago | parent [-]

Do APL programmers think this is a good thing? It sounds a lot like how I feel about currying in language that have it (meaning it's terrible because code can't be reasoned about locally, only with a ton of surrounding context, the entire program in the worst case)

	▲	skruger an hour ago \| parent \| next [-]
		It makes parsing tricky. But for the programmer it’s rarely an issue, as typically definitions are physically close. Some variants like BQN avoids this ambiguity by imposing a naming scheme (function names upper case, array names lower case or similar).
	▲	ofalkaed an hour ago \| parent \| prev \| next [-]
		I am not good enough with APL to be certain but I think you can generally avoid most of these sorts of ambiguities and the terseness of APL helps a great deal because the required context is never far away, generally don't even have to scroll. I have been following this thread to see what the more experienced have to say, decided to force the issue.
	▲	creata 2 hours ago \| parent \| prev [-]
		Huh? Currying doesn't require any nonlocal reasoning. It's just the convention of preferring functions of type a -> (b -> c) to functions of type (a, b) -> c. (Most programming languages use the latter.)

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yvdriess 2 hours ago | parent | prev [-]

And they could be 0- or 1- indexed? :P