Source code in the dart programming language

main() { 
  moveit(from,to) {
    print("move ${from} ---> ${to}");
  }

  hanoi(height,toPole,fromPole,usePole) {
    if (height>0) {
      hanoi(height-1,usePole,fromPole,toPole);  
      moveit(fromPole,toPole);
      hanoi(height-1,toPole,usePole,fromPole);
    }
  }

  hanoi(3,3,1,2);
}


main() {
  String say(String from, String to) => "$from ---> $to"; 

  hanoi(int height, int toPole, int fromPole, int usePole) {
    if (height > 0) {
      hanoi(height - 1, usePole, fromPole, toPole);  
      print(say(fromPole.toString(), toPole.toString()));
      hanoi(height - 1, toPole, usePole, fromPole);
    }
  }

  hanoi(3, 3, 1, 2);
}