closure.dart

void main() {
  
  // Methods
  int result = calculator(1,2, multiply);
  print(result);
 
  
  // Class
  Car lumbargini = Car(drive: driveFast);
  
  lumbargini.drive = driveSlow;
  lumbargini.drive();
}

final Function calculator = (int n1, int n2, Function calculation) {
    return calculation(n1, n2);
  };

int add(int n1, int n2) {
  return n1 + n2;
}

int multiply(int n1, int n2) {
  return n1 * n2;
}

class Car {
  Car({this.drive});
    
    Function drive;
}

void driveSlow() {
  print('drive slow');
}

void driveFast() {
  print('drive fast');
}