public BmiRange ReadBmi(double height, double weight)
{
var result = default(BmiRange);
// defining two pure fake functions to pass into the HOF
// takes a string as input (the field name) and returns a double
// we don't need to double.Parse as we control the test data
Func <string, double> read = s => s == "height" ? height : weight;
// takes a BmiRange and returns void
// uses a local variable (result) to hold the value of BmiRange passed into the function, which the test returns
Action <BmiRange> write = r => result = r;
Bmi.Run(read, write);
return(result);
}
public double CalculateBmi(double height, double weight) => Bmi.CalculateBmi(height, weight);