[Perl 6] Manipulating an array.

my @arr = (1, 2, 3, 4, 5);

# Pop from the rear.
my $popped = @arr.pop;
@arr.elems == 4 or die "Wrong length";
$popped == 5 or die "Wrong value";

# Push into the rear.
@arr.push(99);
@arr.elems == 5 or die "Wrong length";
@arr[4] == 99 or die "Wrong value";

# Shift from the front.
my $shifted = @arr.shift;
@arr.elems == 4 or die "Wrong length";
$shifted == 1 or die "Wrong value";

# Unshift into the front.
@arr.unshift(100);
@arr.elems == 5 or die "Wrong length";
@arr[0] == 100 or die "Wrong value";

# Splice out from arbitrary location.
my @spliced = @arr.splice(1, 3, (20, 30, 40));
@spliced ~~ (2, 3, 4) or die "Wrong array";
@arr ~~ (100, 20, 30, 40, 99) or die "Wrong array";