when I played the Onboarding puzzle with Dart, this provided code did not work.
String enemy1 = stdin.readLineSync();
int dist1 = int.parse(stdin.readLineSync());
String enemy2 = stdin.readLineSync();
int dist2 = int.parse(stdin.readLineSync());
error output:
Answer.dart:7:27: Error: A value of type ‘String?’ can’t be assigned to a variable of type ‘String’ because ‘String?’ is nullable and ‘String’ isn’t.
String enemy1 = stdin.readLineSync();
adding a ! (null check) after the readLineSync() solved the issue:
String enemy1 = stdin.readLineSync()!;
int dist1 = int.parse(stdin.readLineSync()!);
String enemy2 = stdin.readLineSync()!;
int dist2 = int.parse(stdin.readLineSync()!);
or, pressing the “Reset” button and then replacing the output would work, too.
could you fix it? I think it’s hard for the beginners to find out…