Completing sandboxed's comments, this code:

my $sort_by_numeric_value = sub {
    my $hash = shift;
    [ sort {$hash->{$b} <=> $hash->{$a}} keys %$hash ];
};

tie my %sorted_ages, 'Tie::Hash::Sorted',
                     'Hash' => \ %ages,
                     'Sort_Routine' => $sort_by_numeric_value;

for my $name ( keys %sorted_ages ) {
   print "$name is $sorted_ages{$name} years old.\n";
}

[download]

Could've been replaced by:

sub by_numeric_value {
    $ages{$b} <=> $ages{$a}
}

for my $name (sort by_numeric_value keys %ages) {
    print "$name is $ages{$name} years old.\n";
}

[download]
Which is much more concise and easier to understand, IMO.

In reply to Re: meaning for the hash code by alexm
in thread meaning for the hash code by Tony1

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