⌷
Index r←x⌷y
If y
is an array, x
is a vector of integers with length less than or equal to the rank of y
, and depth at most two. r
is the selection of cells from axes of y
, where nested entries of x
indicate that multiple cells are selected, and negative x
indicates indexing from the end.
If y
is a dictionary, r
is the item of y
with key r
.
Supports the origin
extra argument, which offsets x
by the origin (if y
is an array); supports the fill
extra argument, which is the default value returned when the index is out of bounds or doesn't appear in the dictionary.