extractKeys method Null safety

KeyChild extractKeys(
  1. String key
)

Implementation

KeyChild extractKeys(String key) {
  if (key != null && key.contains('.')) {
    List<String> keys = key.split('.');
    String _key = keys.removeAt(0);
    String _subKey = keys.join('.');

    return KeyChild(_key, _subKey);
  }

  return KeyChild(key, null);
}