=head1 Junctions
Motivation: Ways to compare arrays via Junctions
=cut
use 5.0.10;
use Perl6::Junction qw(any all one none);
my @rainbow = qw(red orange yellow green blue indigo violet);
if (any(@rainbow) eq 'indigo') {
say "It's a go.";
}
=head1 Slices of Hash
Motivation: Suppose you got a hash and you want a subset
of the hash values. One can access those values via a hash slice.
Mappings:
function hash slice: hashes -> lists
subset of keys |--> list of values.
How:
List the keys of the wanted values,
but since the return is a list use @ instead of $
as the hash sigil.
Example:
Below
=cut
my %hash = qw(
wednesday brown
friday red
saturday black
);
my @weekend_hash = @hash{qw(friday saturday)};
print 'On the weekend she enjoys ';
print join ', and ', @weekend_hash;
print '.';
=pod
Another example to show how one could set the values of a hash to a default value givens an array to act as the keys.
=cut
my @grades = qw/ 0 1 2 3 /;
my %student_count_by_grade;
@student_count_by_grade{@grades} = (0) x 4;