Depending on your situation, you may also find Data::Alias to provide a good alternative.
use Data::Alias;
my @array = (
[1,2],
[3,4],
[5,6],
);
foreach my $list (@array) {
alias my ($first, $second) = @{$list};
print $first, $second;
}
Any performance hit will be trivial, and you'll get a performance boost over an array if you access the values more than once.
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