public function reject(\Closure $closure): self
    {
        // init
        $filtered = [];

        foreach ($this->getGenerator() as $key => $value) {
            if (!$closure($value, $key)) {
                $filtered[$key] = $value;
            }
        }

        return static::create(
            $filtered,
            $this->iteratorClass,
            false
        );
    }