Question

I believe this is how you would normally sort a hash by value:

foreach my $key (sort { $hash{$a} <=> $hash{$b} } (keys %hash) ) {
    print "$key=>$hash{$key}";
}

This would print out the values smallest to largest.

Now, what if I have a hash like this:

$hash{$somekey}{$somekey2}{$thirdkey}

How could I sort by values and get all the keys as well?

Answer 1

I would just create a new hash:

my %new;
for my $k1 (keys %hash) {
  for my $k2 (keys %{$hash{$k1}}) {
    for my $k3 (keys %{$hash{$k1}{$k2}}) {
      $new{$k1,$k2,$k3} = $hash{$k1}{$k2}{$k3};
    }
  }
}

my @ordered = sort { $new{$a} <=> $new{$b} } keys %new;
for my $k (@ordered) {
  my @keys = split($;, $k);
  print "key: @k      - value: $new{$k}\n";
}