Ouzo\Utilities\Functions::notNull PHP Method

    public static function notNull()
    {
        return function ($value) {
            return !is_null($value);
        };
    }

 /**
  * Returns model object as a nicely formatted string.
  */
 public function inspect()
 {
     return get_called_class() . Objects::toString(Arrays::filter($this->_attributes, Functions::notNull()));
 }