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map $_ // '[undef]'

map defined($_) ? $_ : '[undef]'

for my $nic (networkInfo()) {
    print "Device: $nic->{device} has IP Address $nic->{ip}\n" .
...
    print "Device: $nic->{device} also IPv6 address $nic->{ip6}\n"
        if defined($nic->{device});
}