How to xor three variables in javascript?

Question

Related to my original question, how would you xor three boolean variables in javascript. One variable can be true the rest must be false.

This is my solution, but I feel there is a better one:

function isValid(a, b, c) {
  return (a !== b ! == c) && [a, b, c].includes(false);
}

I've gotten some feed back from the comments, let me define what I'm asking (sorry for all the confusion).

1. I'm actually doing this in a typescript class. I figured I'd just remove the method and make it a classless function. I realize now that this does affect the solution. Sorry about that.

2. I suppose I must have missused the term XOR. What I'm trying to say is, only a OR b OR c can be true, and one of them must be true. I hope that is more clear.

Answer 1

If these are boolean values, just filter and test that only one is true:

function isValid(...args) {
  return args.filter(v => v).length == 1;
}