javascript: pass return value in callback function

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Please help me understand
this:

I have an object
self.domainSettings() which has a save
method. The save returns the result which I want to use in
callback function to populate success or error message. I am using following
code:

self.domainSettings().save(function(data){

            console.log('in here');
 console.log(data);
 console.log('outta
            here');
 }());

function save(){


            return
            'success';
};

When
I do console.log(data) is it guaranteed that the save has
finished executing ? Also it says data is undefined because the return value of save is
not getting passed to callback function I guess. How do I get that
?

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Answer

You have to pass callback in
save() in order to access the result from a
callback.

function
            save(fn){
 return
            fn('success');

};