Re: hash keys compare

[Zaxo]

in reply to hash keys compare

Do the parent keys have to match?

Otherwise,

my @unseen = do {
     delete %{$hash1->{$a}{$b}}, keys %{$hash2->{$d}{$e}};
     keys %{$hash1->{$a}{$b}};
}

That leaves it up to you to set up the parent keys you want in the match. That's destructive of $hash1.

$a and $b are poor choices for variable names. They are sacred to sort and can have side effects.

[Anonymous Monk]

hi Zaxo, What you have done makes sense, except that I dont want to delete but I want to print the variables. I just want to be able to print it . I am also getting this error when I use the code. html delete argument is not a HASH or ARRAY element or slice at db2cfg-report line 394. /html

[Anonymous Monk]

if you do not want to alter the original hashes, then you must make copies of them before deleting. e.g.:

> perl -wMstrict -e
"my $hashrefA = {};  my $hashrefB = {};
 my ($p, $q, $r, $s) = qw(fee fie foe fum);
 $hashrefA->{$p}{$q} = { qw(a 1 b 2  x 8 y 9) };
 $hashrefB->{$r}{$s} = { qw(c 3 d 4  x 6 y 7) };
 my %Apq_not_in_Brs = %{ $hashrefA->{$p}{$q} };
 delete @Apq_not_in_Brs{ keys %{ $hashrefB->{$r}{fum} } };
 my %Brs_not_in_Apq = %{ $hashrefB->{$r}{$s} };
 delete @Brs_not_in_Apq{ keys %{ $hashrefA->{fee}{$q} } };
 print qq(Apq not in Brs: @{[ keys %Apq_not_in_Brs ]} \n);
 print qq(Brs not in Apq: @{[ keys %Brs_not_in_Apq ]} \n);
"
Apq not in Brs: a b
Brs not in Apq: c d

also: please give the monks a break and read and follow the Writeup Formatting Tips; the markup you're using is not doing what you seem to expect.