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

You mentioned in your comment that this is coming from a commander options object.

You can do this more elegantly using Lodash:

if (_(options).values().compact().size() === 1)

If you only want to count a subset of the options, you can insert

.pick('a', 'b', 'c')