How can I check which of several booleans is true?

const isHappy = true
const isGrumpy = false
const isSad = false

switch(true) {
    case isHappy: {
        console.log('isHappy'); 
        break;
    }
    case isGrumpy: {
        console.log('isGrumpy'); 
        break;
    }
    case isSad: {
        console.log('isSad'); 
        break;
    }
    default: {
        console.log('Unknown'); 
        break;
    }
}