Programming Perl, 4th Edition

Composition of a Hash of Arrays

You can create a hash of anonymous arrays as follows:

# We customarily omit quotes when the keys are identifiers.
%HoA = (
    flintstones    => [ "fred", "barney" ],
    jetsons        => [ "george", "jane", "elroy" ],
    simpsons       => [ "homer", "marge", "bart" ],
);

To add another array to the hash, you can simply say:

$HoA{teletubbies} = [ "tinky winky", "dipsy", "laa–laa", "po" ];