in reply to Re^2: Why programming is so much more than writing code
in thread Why programming is so much more than writing code

Better would be: 
sub SUB_NAME {
   # sort by the specified columns 
   $_ = $a->[$_] <=> $b->[$_] and return $_ for 3, 2, 1, 0, 4;
   return 0;
 }

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Modification of a read-only value attempted at 614055.pl line 3.

In Section Meditations