Challenge 261

sub element-digit-sum(@array) {
    @array.sum - @array.map(*.comb.sum).sum
}

say element-digit-sum [1, 2, 3, 45];
say element-digit-sum [1, 12, 3];
say element-digit-sum [1, 2, 3, 4];
say element-digit-sum [236, 416, 336, 350];

multi multiply-by-two(Set() $array, Int $start where $array{$start}) {
    multiply-by-two $array, $start * 2
}

multi multiply-by-two($, Int $start) {
    $start
}

say multiply-by-two [5, 3, 6, 1, 12], 3;
say multiply-by-two [1, 2, 4, 3], 1;
say multiply-by-two [5, 6, 7], 2;