Fold and Other Functional Conjunctions
The Array Cast
00:00
Fold in a J Application
Fold is a conjunction in which in J means it takes two verbs as its arguments so you say you fold V and that combination defines a verb. It's just the latest in a long line of things that APL is added to do useful stuff. If there's no bugs, Fold will eventually be migrated into native C code but it should be part of the standard installed now.
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