sequence(attr) → sequence singleSelection(attr) → value object(attr) → value array(index) → value
Get a single field from an object. If called on a sequence, gets that field from every object in the sequence, skipping objects that lack it.
Example: What was Iron Man’s first appearance in a comic?
() command also accepts integer arguments as array offsets, like the nth command.
Example: Get the fourth element in a sequence. (The first element is position
0, so the fourth element is position
r.expr([10, 20, 30, 40, 50])(3) 40
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