Just be careful about $description{foo} that evaluate to false:
use strict;
use warnings;
my %description = ( a => 'a vowel',
b => 'a consonant',
0 => '0',
default => 'not in the alphabet' );
for my $char (qw/a b c 0/) {
my $d = $description{$char} || $description{default};
print("$char is $d\n");
}
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