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Re: how to sort HoH according to value

by sgifford (Prior)
on Jun 19, 2008 at 02:28 UTC ( #692835=note: print w/replies, xml ) Need Help??

in reply to how to sort HoH according to value


The key thing to realize here is that a hash doesn't have any notion of order. The most straightforward solution is to copy the information you want from the hash into a list, which is ordered, then sort the list. For example:

# Convert HoH into a list of arrayrefs: [value, key1, key2, ...] my @list; while (my($k1,$v1) = each(%HoH)) { while (my($k2,$v2) = each(%$v1)) { push @list, [$v2, $k1, $k2]; } } # Sort the list by its first element @list = sort { $a->[0] <=> $b->[0] } @list; # Now print the list foreach my $elt (@list) { print "@$elt\n"; }

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