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array-rank
array => rank
array—an array.
rank—a non-negative integer.
Returns the number of dimensions of array.
(array-rank (make-array '())) => 0 (array-rank (make-array 4)) => 1 (array-rank (make-array '(4))) => 1 (array-rank (make-array '(2 3))) => 2
Should signal an error of type type-error if its argument is not an array.