This is trivial using List::Pairwise, even if the values aren't unique.
use List::Pairwise 'mapp';
my %hash = (
foo => 1,
bar => 2,
baz => 1,
bux => 0,
);
my $val = $hash{foo};
my @keys = mapp { $b eq $val ? $a : () } %hash;
print "@keys";
__END__
baz foo
Even if you think that your values are unique it's sometimes a good idea to assert this:
my ($key, @too_many) = mapp { $b eq $val ? $a : () } %hash;
! @too_many
or die 'Too many ...';
lodin
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