Perl 6 Data Types: hashes

my Int %roman = ('I' => 1, 'II' => 2, 'III' => 3, 'IV' => 4);

say %roman{'III'};

say %roman.keys.join(", ");

for %roman.kv -> $key, $value {
  say "$key = $value";
}

%roman.delete<IV>;

say %roman<I II III>.join(', ');