It's quite a common pattern in object-oriented programming to have an attribute which takes a string as its value, but which only has a small number of valid values. For example:

 package Shirt;
 use Moose;
 
 # "S", "M", "L", or "XL"
 has size => (is => 'ro', isa => 'Str', required => 1);

This offers no protection against invalid string values.

 # No exception is thrown
 my $shirt = Shirt->new(size => "LX");

Welcome to Planet Moose, a brief write up on what's been happening in the world of Moose in the past month, for the benefit of those of you who don't have their eyes permanently glued to the #moose IRC channel, or the MetaCPAN recent uploads page.

Apologies for being a little late delivering the news this month. If you'd like to contribute some news for next month's issue, you can do so on the wiki.

Moose

Version 2.1205 is a minor update containing a small bug fix and an improved test case. One interesting new addition is the is_role function in Moose::Util.