You just need to change your logic, so you make a copy when you find something you like, rather than delete everything that you don't like.

replace:

foreach my $k ( keys %{HoH} ) 
{
    unless ( $HoH{$k} and values %{$HoH{$k}} ) 
    {
       delete $HoH{$k};
    }
}

[download]

with :

my %HoHCopy;
foreach my $k ( keys %HoH ) 
{
    if ( $HoH{$k} and values %{$HoH{$k}} ) 
    {
       $HoHCopy{$k} = $HoH{$k};
    }
}

[download]

and then replace the calls to %HoH to %HoHCopy below that.

You could also change that same block out with:

my %HoHCopy = map
  { $_ => $HoH{$k} }
  grep {
    $HoH{$_} and values %{$HoH{$_}}
  } ( keys %HoH );

# or 

my %HoHCopy = map
  {
    ($HoH{$_} and values %{$HoH{$_}})
    ? ($_ => $HoH{$k})
    : ()
  } ( keys %HoH );

[download]

In reply to Re: How not to destroy a Hash in HoH by jhourcle
in thread How not to destroy a Hash in HoH by Anonymous Monk

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