sort Indices
Constructs an array that holds the indices of the items in the data in their sort order. Example: If the array is 2,3,1,4,5, then 2,0,1,3,4 is returned. Recall that indices are zero-based.
Return
the indices of the original items indicating the sort order
Parameters
data
the data to sort
descending
if true, the sort will be descending rather than ascending. The default is false (ascending).