createID method

String createID(
  1. String id
)

If id is not already assigned a new identifier, then constructs one with _newId. Then advances the new id set via advanceNextId.

Implementation

String createID(String id) {
  if(_nextId.isEmpty) {
    _nextId.add('a');
  }

  final newid = ids[id] =  _nextId.join();
  advanceNextId();
  return newid;
}