"Breaking out" of a promises chain

.js

/* Short answer: don't. Use conditional branches instead. See below. */

Promise.try(function(){
    return someAsyncThing();
}).then( (value) => {
    if (value === 3) {
        return "final value";
    } else {
        return Promise.try( () => {
            return someOtherAsyncThing();
        }).then( (secondValue) => {
            return getFinalValue(secondValue);
        });
    }
});