Hello so I have two functions, the first gets tweets and the second gets ads and inserts them into the first array, for some reason calling the getAd function makes all the tweets.user var equal to nil. So when I run the app I briefly see all the tweets, then they disappear because the getAd function is called and their user values become nil. And after this only the ad is displayed. How can I fix this so that the user values do not become nill, I think this is an asynchronous issue and that's why I tried to do it inside the closer when i == count -1, but this did not work. class FeedViewModel: ObservableObject{ @Published var new = [Tweet]() var ads = [Tweet]() let service = TweetService() let userService = UserService() init(){ fetchNew() } func fetchNew() { service.fetchNew { tweets in self.new = tweets self.lastNew = tweets.last?.timestamp ?? Timestamp(seconds: 2, nanoseconds: 2) for i in 0 ..< tweets.count { let uid = tweets[i].uid self.userService.fetchUser(withUid: uid) { user in self.new[i].user = user if i == (tweets.count - 1){ self.new.sort { $0.promoted < $1.promoted } self.getAd(myArray: tweets, direction: 1) } } } } } func getAd(myArray: [Tweet], direction: Int) { var localArray = myArray service.fetchAd { ads in self.ads = ads self.lastAd = ads.last?.timestamp ?? Timestamp(seconds: 2, nanoseconds: 2) self.ads.sort { $0.plus ?? true && !($1.plus ?? false) } for i in 0 ..< ads.count { let uid = ads[i].uid self.userService.fetchUser(withUid: uid) { user in self.ads[i].user = user if i == (ads.count - 1){ let a = self.ads[0] localArray.append(a) self.new = localArray } } } } }