public function findLastIndex(callable $condition)
    {
        $index = -1;

        for ($i = count($this->items) - 1; $i >= 0; $i--) {
            if ($condition($this->items[$i])) {
                $index = $i;
                break;
            }
        }

        return $index;
    }
public function findLastIndex(callable $condition)
    {
        $index = -1;

        for ($i = count($this->items) - 1; $i >= 0; $i--) {
            if ($condition($this->items[$i])) {
                $index = $i;
                break;
            }
        }

        return $index;
    }
{@inheritdoc}