/**
* calls $fn for every value,key pair
*
* @param callable $fn($value, $key)
* @return Iterator
*/
public function walk($fn)
{
return IterationTraits::walk($this, $fn);
}
/**
* calls $fn for every value,key pair
*
* @param callable $fn($value, $key)
* @return Iterator
*/
public function walk($fn)
{
return IterationTraits::walk($this, $fn);
}