Something like this?
use 5.010;
use strict;
use warnings;
use List::Util 'sum';
my %messages;
$messages{one} = {
from => "Alice",
to => "Bob",
size => 1000,
};
$messages{two} = {
from => "Bob",
to => "Carol",
size => 200,
};
$messages{three} = {
from => "Carol",
to => "Dave",
size => 30,
};
$messages{four} = {
from => "Dave",
to => "Eve",
size => 4,
};
say sum map $_->{size}, values %messages;
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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