/**
* Returns the values from a single column of the array, identified by the column_key.
* Optionally, you may provide an index_key to index the values in the returned array by the values from the
* index_key column in the input array.
* @param string $columnKey
* @param string|null $indexKey
* @return Variables
*/
public function column($columnKey, $indexKey = null)
{
$value = array_column($this->value(), $columnKey, $indexKey);
return Variables::from($value);
}
