in reply to (Mis)Understanding grep...eq $_
I thought I understood grep $person_has eq $_, $item {...} to mean:
That's not valid Perl.
search $person_has for
grep $person_has eq $_, $item searches through the list after the comma ($item), not through $person_has. The first expression tells us what is being sought: elements equal to $person_has.
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Seekers of Perl Wisdom