That is a bad habit, which if you are just starting you
would be advised to break right now.
Please see my comments in the thread starting at
$_ haters anonymou for details of why.
For the record, I am still not confident that I
know all places where $_ will be used unexpectedly to
me. You should not stomp over it thoughtlessly. Instead
leave $_ alone before you have to ask how your map
statement wound up eating up the array...
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