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Think about Loose Coupling
 
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I'm no Ruby expert, but I think you're misinterpreting the example in the book. @@population is a "class attribute", not an object attribute. In other words, it's a property of the "Person" class; not a property of each Person.

Using Moose you could model it along these lines:

package Person { use Moose; use MooseX::ClassAttribute; has name => (is => 'ro', isa => 'Str'); class_has population => (is => 'ro', isa => 'ArrayRef'); } my $bob = Person->new(name => "Robert"); push @{ Person->population }, $bob;

Though there are many reasons to avoid class attributes. (Basically think of all the good reasons to avoid global variables, and then s/global variables/class attributes/gi.)

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re^3: How to remove the certain element of an object by tobyink
in thread How to remove the certain element of an object by vagabonding electron

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