In a deferred function you can alter the returned parameters, but you can’t return a new set. So a simple change to what you have will make it work. There is another problem with what you wrote, namely that the you’ve paniced with a string but are expecting an error in your type assertion. Here … Read more
This depends more on how you’re going to use them, doesn’t it? If your code looks like: var imageLoading = loadImage(url); // returns promise imageLoading.done(showImage); // imageLoading.done // imageLoading.error // imageLoading.then // imageLoading.success // imageLoading.fail // … whatever your library supports Then, I might suggest naming the promise something like a present-tense verb… BUT if … Read more
What you need to use is $q.all which combines a number of promises into one which is only resolved when all the promises are resolved. In your case you could do something like: function outerFunction() { var defer = $q.defer(); var promises = []; function lastTask(){ writeSome(‘finish’).then( function(){ defer.resolve(); }); } angular.forEach( $scope.testArray, function(value){ promises.push(writeSome(value)); … Read more
In each case, return the jqXHR object returned by $.ajax(). These objects are Promise-compatible so can be chained with .then()/.done()/.fail()/.always(). .then() is the one you want in this case, exactly as in the question. function first() { return $.ajax(…); } function second(data, textStatus, jqXHR) { return $.ajax(…); } function third(data, textStatus, jqXHR) { return $.ajax(…); … Read more
The feature has been implemented in this pull request and is now part of AngularJS. It was initially called “always” and then later renamed to finally, so the code should be as follow: LoadingOverlay.start(); Auth.initialize().then(function() { // Success handler }, function() { // Error handler }).finally(function() { // Always execute this on both error and … Read more
Just move your program down a level and return your exit code: package main import “fmt” import “os” func doTheStuff() int { defer fmt.Println(“!”) return 3 } func main() { os.Exit(doTheStuff()) }
Calling $q.when takes a promise or any other type, if it is not a promise then it will wrap it in a promise and call resolve. If you pass a value to it then it is never going to be rejected. From the docs: Wraps an object that might be a value or a (3rd … Read more
This is not going to be a complete answer to your question, but hopefully this will help you and others when you try to read the documentation on the $q service. It took me a while to understand it. Let’s set aside AngularJS for a moment and just consider the Facebook API calls. Both the … Read more
These answers, including the selected answer, are good for introducing promises conceptually, but lacking in specifics of what exactly the differences are in the terminology that arises when using libraries implementing them (and there are important differences). Since it is still an evolving spec, the answer currently comes from attempting to survey both references (like … Read more