mixin

main.dart

void main() {
  final person = Person(name: 'Arin', height: 160.0, weight: 55.0);
  print(person.bmi);
}

mixin BMI{
  double calculate(double height, double weight){
    return weight / (height * height);
  }
}

class Person with BMI{
  Person({this.name, this.weight, this.height});
  final String name;
  final double height;
  final double weight;
  
  double get bmi => calculate(height, weight);
  
}