perlquestion roho I have a Moose class with an attribute that is not required. When I try to access this attribute in an object where it is not present, the warning message <i>"Use of uninitialized value in concatenation (.) or string"</i> is generated. How can I check for the presence of an optional attribute without generating the warning message? <p> The sample code below is a simple Moose class with 1 required attribute (name) and 1 optional attribute (age). The 'show_person' method generates the warning message because $self->age() is not present in the current object. </p> <p> Just referencing $self->age() in 'show_person' to test it generates the warning, as in: <br> <code>if ($self->age() ne '') {...};</code> </p> <p> <code> #!/usr/bin/perl package Person; use Moose; has 'name' => ( is => 'ro', isa => 'Str', required => 1); has 'age' => ( is => 'ro', isa => 'Str'); sub show_person { my $self = shift; return $self->name() . " " . $self->age(); } __PACKAGE__->meta->make_immutable; no Moose; 1; my $person = Person->new(name => "Bob"); print "\n", $person->show_person(), "\n"; </code> <div class="pmsig"><div class="pmsig-140424"> <p> "Its not how hard you work, its how much you get done." </div></div>