Using either AngularJS's simple .then method or the $q service to handle asynchronous requests

Question

Using either AngularJS's simple .then method or the $q service to handle asynchronous requests

I'm trying to understand the distinction between AngularJS $q service and simply using .then() after an asynchronous request.

For example, using .then():

function InboxService($http) {
  this.getEmails = function getEmails() {
    return $http.get('/emails');
  };
}

And then when utilizing the service (snippet of code):

InboxService.getEmails()
.then(function (response) {
  // handle response data
});

How does the $q service differ, particularly with its ability to resolve and reject promises?

javascript angularjs promise angular-promise q

Answer 1

Answer №1

What sets apart $q service from resolve and reject methods?

It seems like you're inquiring about the necessity of using var deferred = $q.defer() followed by deferred.resolve() or deferred.reject(). The answer to this is that it's not required because the $http service already returns a promise object for you. Creating another promise manually with $q is discouraged and seen as an anti-pattern.

If you are working with asynchronous functions (such as timeouts or ajax requests) that are not inherently wrapped in a promise, then using $q to create and return a promise would be appropriate. However, in your scenario, utilizing $http service is sufficient and creating an additional promise is unnecessary.

Answer 2

What sets apart $q service from resolve and reject methods?

It seems like you're inquiring about the necessity of using var deferred = $q.defer() followed by deferred.resolve() or deferred.reject(). The answer to this is that it's not required because the $http service already returns a promise object for you. Creating another promise manually with $q is discouraged and seen as an anti-pattern.

If you are working with asynchronous functions (such as timeouts or ajax requests) that are not inherently wrapped in a promise, then using $q to create and return a promise would be appropriate. However, in your scenario, utilizing $http service is sufficient and creating an additional promise is unnecessary.

Answer 3

Answer №2

It is often unnecessary to include the $q element, as it is not needed in most cases. For more information, you can visit:

Answer 4

It is often unnecessary to include the $q element, as it is not needed in most cases. For more information, you can visit:

Using either AngularJS's simple .then method or the $q service to handle asynchronous requests

Answer №1

Answer №2

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