($self->{lib}) = ($lib->get_list("library"));
 # this is a lot like
 my @list = $lib->get_list("library");
 my ($var) = @list;
 
 # only it's storing it in {lib}


 # and
 $self->{lib}->get_value
 # is then rather like
 $var->get_value
 # which is rather like
 $list[0]->get_value