You could do something like the following:
my %users;
my %rank_order = (
Leader => 1,
Chairman => 2,
Lieutenant => 3,
Veteran => 4,
Rookie => 5,
);
sub by_hi_rank {
$rank_order{$users{$a}{title}} <=> $rank_order{$users{$b}{title}
+}
|| $a cmp $b
}
sub by_lo_rank {
$rank_order{$users{$b}{title}} <=> $rank_order{$users{$a}{title}
+}
|| $a cmp $b
}
my %sorters = (
by_rank => {
ascending => \&by_hi_rank,
descending => \&by_lo_rank,
},
by_user => {
ascending => sub { $a cmp $b },
descending => sub { $b cmp $a },
},
);
my $sorter = $sorters{$criteria}{$order}
or die;
my @sorted_users = sort { $sorter->() } keys %users;
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