Question

Like a person asked here (but his solutions as to call a nother function) https://stackoverflow.com/a/10796326/315200 …I would like to know if its possible to have a function which doesn’t call a second function on response of an async request, but simply return when the async request responses.

Something like this maybe:

function callToFacebook() {
    var fbResponse;

    FB.api('/me', function (response) {
        fbResponse = response;
    });

    return fbResponse; //Will return undefined because CallToFacebook is async
}

Isn’t that possible some way, without calling another function??

What I’m trying to achieve is to have one function I can call with some parameters, which will return the response object from a async webservice, like FB.

Answer 1

In short, no. You cannot have an asynchronous function return a meaningful value synchronously, because that value does not exist at that time (as it is built asynchronously in the background).

You can, however, return a Promise object, representing the “potential return value” of the asynchronous operation, and bind a function to that object using done() or similar. That way, your function gets return semantics (instead of having to chain the control flow into a callback), and remains asynchronous.