calculate number of true (or false) elements in a bool array?

Question

Suppose I have an array filled with Boolean values and I want to know how many of the elements are true.

private bool[] testArray = new bool[10] { true, false, t         


        

Answer 1

While testArray.Count(c => c) is functionally correct, it's not intuitive and there's a risk that some later developer will strip out the c => c part thinking it doesn't do anything.

This can be derisked by declaring the lambda function separately with a meaningful name:

Func ifTrue = x => x;
return testArray.Count(ifTrue);