Your way is more than adequate.

You can also create enums with Moose::Util::TypeConstraints, if you happen to be using Moose. (Which you should be.)

Your way is more than adequate.

You can also create enums with Moose::Util::TypeConstraints, if you happen to be using Moose. (Which you should be.)

use Moose::Util::TypeConstraints;

has 'phone_number' => (
    is  => 'ro',
    isa => enum([qw/ Home Work Mobile /]),
);