Promise is not resolved to a value?

Question

I can't find my mistake in the following code. All I want is save() to return true or false but its always undefined

function mypromise() {
  return new Promise((resolve, reject) => {
    resolve("it worked")
  })
}

function save() {
  mypromise().then(success => {
    return true
  }, error => {
    return false
  });
}

var saveSuccessful = save();
console.log('success', saveSuccessful) // undefined ?

Your function `save()` does not return anything - what did you expect? — Benjamin Gruenbaum, Jan 09 '16 at 21:05
@BenjaminGruenbaum When I do `save mypromise().then()` I get the pending Promise back. Is there a way to return the value directly? — Hedge, Jan 09 '16 at 21:07
Possible duplicate of [How do I return the response from an asynchronous call?](http://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call) — Amit, Jan 09 '16 at 21:44
Your `save` function returns nothing. Please make sure, don't missed to return promise out of here. Then you should use `.then` to check whether save was success or not — just-boris, Jan 10 '16 at 12:14

score 0 · Accepted Answer · answered Jan 09 '16 at 21:35

You'll know if the save is successful only when the promise has finished executing, like so:

function mypromise() {
  return new Promise((resolve, reject) => {
    resolve("it worked")
  })
}

function save() {
  mypromise().then(success => {
    console.log('success');
    return true;
  }, error => {
    return false
  });
}

save();

If you could write var saveSuccessful = save(); that would mean that save() is synchronous, by definition of synchronous, but you explicitely want it to be asynchronous.

And see http://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call for more details. — Ilya, Jan 09 '16 at 23:17

Promise is not resolved to a value?

1 Answers1