main.dart

void main() {
 final List<String> flutterMasters = ['@dushesatwork', '@BleylDev', '@tadaspetra', '@JohannesMilke', '@sachaarbonel', '@BleylDev'];
 print(flutterMasters);
  print('Length of collection: ${flutterMasters.length}');
 final Set <String> uniqueMasters = {...flutterMasters};
  print(uniqueMasters);
  print('Length of collection: ${uniqueMasters.length}');
}