Esteemed Monks,

I am a big fan of this data structure, but I am ashamed to admit I am not even sure what it is called. I know it is some form of hash (obviously), but I have been pouring over the perldocs, especially perldsc, to try and finally figure out it's name, but I have finally admitted defeat. It appears to be a simple hash, but the key linking it to {$ip} is what is confusing me.

I would also like to know if it is possible to add a new key/value pair to the existing hash without having to create a new one, which is what I did to get the results I was after.

This is my existing data structure: 
$hashIPs{$ip} = {
                totalVulns => $ipTotalVulns,
                vulns => $vulns
};

[download]
and later in my code, I would like to add: 
region => $region

[download]
I was able to accomplish what I wanted with the following, but for curiosity's sake, I would like to know if I could have avoided having to create the 2nd hash. 

my $hashIPs{$ip} = {
                totalVulns => $ipTotalVulns,
                vulns => $vulns
};       

my $hashrefIPs = \%hashIPs;

my $hashIPsNew{$ip} = {
                region => $region,
                totalVulns => ${$hashrefIPs}{$ip}{totalVulns},
                vulns => ${$hashrefIPs}{$ip}{vulns}
};

for my $ip (keys %hashIPsNew){
print "$ip -- $hashIPsNew{$ip}{region} -- $hashIPsNew{$ip}{totalVulns}
+ -- $hashIPsNew{$ip}{vulns}\n";
}

[download]
Thanks,
Dru

Perl, the Leatherman of Programming languages. - qazwart

In reply to Mystery (to me) Data Structure by Dru

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