How about this?
#!/usr/bin/perl -w
use strict;
my %data = (
1 => 'foo',
3 => 'bar',
7 => 'baz',
12 => 'fumble'
);
print &find_nearest (10, \%data);
sub find_nearest($\%) {
my $target = shift;
my %data = %{shift()};
while (!defined $data{$target}) {
$target--;
}
return $target;
}
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