/**
* @inheritdoc
*
* @param callable $func - If no callback is supplied, all entries of container equal to FALSE will be removed.
* @param null $flag - Flag determining what arguments are sent to callback
* - USE_KEY
* - pass key as the only argument to callback instead of the value
* - USE_BOTH
* - pass both value and key as arguments to callback instead of the value
*
* @return HArray
*
* @throws \InvalidArgumentException
*/
public function filter(callable $func = null, $flag = null)
{
$answer = new Filter($this);
return new static($answer->filter($func, $flag));
}
/**
* @inheritdoc
*
* @return HString
*
* @throws \InvalidArgumentException
*/
public function filter(callable $func = null, $flag = null)
{
$answer = new Filter($this->toHArray());
return new static((new HArray($answer->filter($func, $flag)))->toHString());
}
