Question

I’m looking at the following code snippet:

my @ret = <someMethod> return (undef) if( $DB_ERROR ); return (undef) unless ($#ret >= 0); 

Does $# just give you a count of elements in a array?

Answer 1

$#arrayname gives you the index of the last element, so if array @ret has 2 elements then $#ret is 1.

And, as noted by Barry Brown, an empty array gives -1.

To get the length you can use the array in scalar context:

print scalar @ret;