Perl 6 Deep Dive

Hashes

In the array, indexes are integer numbers starting from zero. Hashes are another structural type of data in Perl 6 that can be treated as arrays whose indices are strings.

Hashes use the % sigil. Other names for hashes from various programming languages are associative arrays, dictionaries or dicts, and maps. Hashes are very useful when you need to keep a few values together. For example, take a look at the following code snippet:

my %city =     name => 'London',    country => 'gb',    latitude => 51.52,    longitude => 0,    area => 1577,    inhabitants => 8_700_000;

Elements of the hash are pairs, which are in turn two things—the key and the value. In this example, keys of the %city hash are name, country, and so on, and their values are London