Working with promises inside an if/else

Question

I have a conditional statement in which I need to perform one of two operations, then continue after whichever operation has resolved. So my code currently looks as follows:

Answer 1

If you can use async/await

async function someFunc() {
    var more_code = function () { 
        // more code
    }

    if (shoud_do_thing_a) {
        await do_thing_a()
    } else {
        await do_thing_b()
    }

    more_code()
}

Or if you can't, use then():

var more_code = function () { 
    // more code
}

var do_thing;
if (shoud_do_thing_a) {
  do_thing = do_thing_a()
} else {
  do_thing = do_thing_b()
}

do_thing.then(more_code)