Re^3: Converting array of hash references to hash

in reply to Re^2: Converting array of hash references to hash
in thread Converting array of hash references to hash

I do not understand. If I run:

use strict;
use warnings;
use Data::Dumper;
my $ams_hosts = [ 
        {
                'domainId' => '1',
                'deviceIp' => '172.16.133.56',
                'deviceType' => 3,
                'deviceName' => 'AMS'
        },
        {
                'domainId' => '1',
                'deviceIp' => '172.16.133.57',
                'deviceType' => 3,
                'deviceName' => 'ams_57'
        }
        ];
my %ams_ips_hash = map { $_->{'deviceIp'} => 1 } @{$ams_hosts};
print Dumper( \%ams_ips_hash );
[download]

I get

$VAR1 = {
          '172.16.133.56' => 1,
          '172.16.133.57' => 1
        };
[download]

Can you clarify what you mean please?

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