subset Longitude of Rat where -180 <= * <= 180; subset Latitude of Rat where -90 <= * <= 90; class GeoPoint { has Latitude $.lat is rw is required; has Longitude $.lon is rw is required; method gist { ($!lat >= 0 ?? "N$!lat" !! "S{-$!lat}") ~ " " ~ ($!lon >= 0 ?? "E$!lon" !! "W{-$!lon}") } } my $geo = GeoPoint.new(lat => 39.1915045, lon => -96.6070506); say $geo.lat; # 39.1915045 say $geo.lon; # -96.6070506 say $geo; # N39.1915045 W96.6070506