I solved a simple: print 1 - 100 without using a loop. I simply used recursion!

no_loop.dart

void main() {
  // instantiation
  final noLoop = NoLoop(max: 100);
  
  // method call:- prints 1 - 100
  noLoop.withoutLoop();
}

class NoLoop {
  static int i = 0;
  int max;
  
  NoLoop({ required this.max });
  
  void withoutLoop() {
  i += 1;
  print(i);
  
  if (i < max) {
  // func call again:- recursion
  withoutLoop();
  }
  }
}