>From what I know, J verbs all have positive rank, in other words, none of
them are able to take a noun item-by-item as a function of the noun rank.
Of course, a verb with rank-1 will process a rank-2 noun item by item. But
that same verb will process rank-3 noun list by list, not item by item.
So, unless a verb's rank is _1 (I dont think that is possible), then no J
primitive handles nouns item by item.
The reason I am bringing this up is this:
http://www.jsoftware.com/help/jforc/declarations.htm
In the Lists section it says
So many of J's primitives operate on items of their operands that we will
find ourselves usually thinking of an array as a list of its items.
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