Javascript - if with asynchronous case

Question

My question is a bit regards concept.

A lot of times there is this such situation:

if(something){
    someAsyncAction();
}else{
    someSyncAction();         


        

Answer 1

With promises, you would have a similar pattern as with the callback, only you would store the result first and not have to call/pass the callback twice:

function after(result) {
    // Continue with the rest of code..
    var a = 5;
}
var promise;
if (something){
    promise = someAsyncAction();
} else {
    promise = Promise.resolve(someSyncAction());
}
promise.then(after);

Or in short, you'd use the conditional operator and structure it much more straightforward:

(something
  ? someAsyncAction()
  : Promise.resolve(someSyncAction())
).then(function(result) {
    // Continue with the rest of code..
    var a = 5;
});