Check exactly one boolean option set

Question

Well, this is kind of hacky:

function b2n(boo) {
    return boo ? 1 : 0;
}

if(b2n(opt1) + b2n(opt2) + b2n(opt3) !== 1) {
    throw new Error(\"Exactly one o         


        

Answer 1

Assuming you had an array of options, you could do:

if(opts.filter(Boolean).length !== 1) {}

It seems to me though that you ought to have one variable with three possible states instead...

var opt = 'a'; // (or 'b', or 'c')