#!/usr/bin/env perl
# Core Modules
use strict;
use warnings;
use utf8;
use 5.010;
use open ':encoding(UTF-8)';
use open ':std';
use MooseX::Declare;

class Person {
    has 'name' => ( is => 'ro', isa => 'Str' );
    has 'private_phone_numbers' => (
        traits  => ['Array'],
        is      => 'ro',
        isa     => 'ArrayRef[Str]',
        default => sub { [] },
        handles => {
            all_private_numbers   => 'elements',
            add_private_number    => 'push',
            count_private_numbers => 'count',
            get_private_number    => 'get',
        },
    );
}

my $person = Person->new( name => 'David Raab' );
say "Numbers: ", $person->count_private_numbers;

$person->add_private_number('0171123456');
say "Numbers: ", $person->count_private_numbers;

$person->add_private_number('1234567890');
say "Numbers: ", $person->count_private_numbers;

say for $person->all_private_numbers;

Numbers: 0
Numbers: 1
Numbers: 2
0171123456
1234567890