Create empty promise in angularjs?

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Like Bixi wrote, you could use $q.when() which wraps a promise or a value into a promise. If what you pass to when() is a promise, that will get returned, otherwise a new promise is created which is resolved directly with the value you passed in. Something like this:

var promise;
if(!$scope.user){
  promise = UserService.create(params);
} else {
  promise = $q.when($scope.user);
}

promise.then(function(user){
  //either user was created or the user already exists.
});

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