Perl 5.19.4 and above. With hashes it seems fairly useful...
sub new {
my ($class, %args) = @_;
my $self = { %args{"foo", "bar", "baz"} };
bless $self, $class;
}
Used on arrays, a la %arr[1,2,3] it seems less so.
See also
use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name
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