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Re: Converting HoA into AoH

by robin (Chaplain)
on Oct 31, 2005 at 18:10 UTC ( #504383=note: print w/replies, xml ) Need Help??

in reply to Converting HoA into AoH

Here is a confusing but concise recursive function that does what I think you want.

sub hoa2aoh { my ($h, @r) = shift; keys %$h; my ($k,$v) = each %$h or return [{}]; delete $h->{$k}, return hoa2aoh($h) if !@$v; my $hd = shift @$v; my $r = hoa2aoh($h); (exists $_->{$k} ? push(@r, {%$_, $k=>$hd}) : ($_->{$k} = $hd)) foreach @$r; push @$r, @r; return $r; }
It destroys the input, so you might need to make a deep copy of it first.

I would explain how it works, but itís quite a fun puzzle like this. :-)

Update: Roy Johnson (above) has just posted a nicer implementation of the same idea.

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