# ARRAYS

my @a = <94 13 97 95>;

for @a -> $e {
    say $e;
}

# HASHES

my %hash = (
    'one'   => 'un',
    'two'   => 'deux',
    'three' => 'trois'
);

for %hash.keys -> $key {
    say "$key => %hash{$key}";
}

for %hash.kv -> $key, $value {
    say "The word '$key' is '$value' in French.";
}

# SUBROUTINES

sub perl5 {
    my ($x) = @_;
    say $x;
}

perl5('old-fashioned');

sub parameters ($foo) { say $foo }
parameters('some parameter');
parameters 'some parameter';
parameters foo => 'some parameter';
parameters :foo('some parameter');

sub whole (@names, %flags) {
    for @names -> $name { 
        say $name;
    }

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

my @stuff = ('array', 'elements');
my %flags = (hash => 'elements', are => 'pairs');

whole(@stuff, %flags);

sub optional ($required, $optional?) {
    my $second_arg = $optional // 'Told you it was optional!';
    say $required;
    say $second_arg;
}

optional('this');
optional('this', 'that');

sub named_params ($first, :$second, :$third) {
    say $first, $second, $third;
}

named_params(1, second => 2, third => 3);

sub transport ($planet, *@names) {
    say "Transporting to $planet:";
    for @names -> $name {
        say "\t$name";
    }
}

transport('Magrathea', 'Arthur', 'Ford', 'Ovid');

sub typed (Int $val) {
    say $val + 3;
}

typed(3);

# LOOP OVER STDIN

while $_ = =<> {
    .print;
}

# OPEN A FILE FOR READING

my $input = open("myfile.txt", :r) err die $!;

my $line = $input.readline;

$input.close;

# OPEN A FILE FOR WRITING

my $output = open("out.txt", :w) err die $!;

$output.say("blah");

$output.close;
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