AngularJS - promises and error handling

Question

I'm trying to find out an answer to my question - does

myFunction()
        .then(function (response) { })
         .catch(function(error) { });

is the same as

myFunction()
        .then(function (response) { },
        function(error) {});

to handle errors from the promise? If so which one should be used as best practice?

The default promise type for angular is $q and per the documentation docs.angularjs.org/api/ng/service/$q the two are the same. However, this is only for promises generated from angular. There are other promise libraries out there. — imaCoden
– imaCoden, Commented Sep 22, 2017 at 18:44
The industry is the process of changing out promisses. It's actually been added to the spec in es6. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… is a basic intro, developers.google.com/web/fundamentals/getting-started/primers/… talks about poly-fills because not all browsers support native promise yet. — imaCoden
– imaCoden, Commented Sep 22, 2017 at 18:49
For additional libraries out there I suggest doing a search on npmjs.com — imaCoden
– imaCoden, Commented Sep 22, 2017 at 18:52

lealceldeiro · Accepted Answer · 2017-09-22 18:54:59Z

1

Yes, with they both you will get the same result.

From $q service

catch(errorCallback) – shorthand for promise.then(null, errorCallback)

About to which one to use as a best practice... It's a matter of perspective: IMHO, you can use them both indistinctly.

answered Sep 22, 2017 at 18:48

lealceldeiro

15.1k7 gold badges54 silver badges85 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1