indexOfKey method

int indexOfKey(
  1. Key? key
)

Implementation

int indexOfKey(Key? key) {
  if (key == null) {
    throw ArgumentError('Key cannot be null');
  }
  final idx = indexWhere((m) => m.key == key);
  if (idx < 0) {
    throw StateError('Marker not found for key : $key');
  }
  return idx;
}