What happens if a promise completes before then is called?

Question

Let\'s say I have a Promise like this:

var promise = new Promise(function(resolve, reject) {
    // Do some async thing
});
promise.then(functio         


        

Answer 1

The then callback will never get called before the promise is resolved, which is what I think you mean by complete. However, if a promise is resolved before it is returned from a function, any additional success callbacks chained after that moment will still be executed. For example,

function getMeAResolvedPromise() {
    var prom = new Promise();
    prom.resolve('some val');
    return prom;
}

...

getMeAResolvedPromise.then(function(result) {
    // this will still be executed
});