If an array is empty, ($#ARRAY == 0) is false. $#ARRAY is -1 for an empty array, because $#ARRAY returns the index of the last valid element, not the number of elements in the array. An array with one element has a last element of index zero.

You can do your check for an empty argument list with any of the following: (not @ARGV), (0 == @ARGV), or ($#ARGV < 0). I prefer the first, but it's a matter of style.

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