public BmiRange ReadBmi(double height, double weight)
        {
            var result = default(BmiRange);
            Func <string, double> read  = s => s == "height" ? height : weight;
            Action <BmiRange>     write = r => result = r;

            Bmi.Run(read, write);
            return(result);
        }
 public double CalculateBmi(double height, double weight)
 => Bmi.CalculateBmi(height, weight);