Raku Books / Perl 6 at a Glance / Perl 6 Essentials / Built-in types

Hash

Hashes provide a few methods with clear semantics, for instance:

my %hash = Language => 'Perl', Version => 6;

say %hash.elems;  # number of pairs in the hash
say %hash.keys;   # the list of the keys
say %hash.values; # the list of the values

Here’s the output:

2
(Version Language)
(6 Perl)

It is possible to iterate not only over the hash keys or values but also over whole pairs:

for %hash.pairs {
    say $_.key;
    say $_.value;
}

The .kv method returns a list containing the alternating keys and values of the hash:

say %hash.kv # (Version 6 Language Perl)

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