swift - Alamofire call not working inside loop -

i have loop meant make 10 different calls youtube's api using alamofire, each different videoid function. call however, doesn't seem made because i'm not getting results success nor failure options in alamofire switch.

can point out whats wrong?

func getrecom(completion: (result:string)->()) {     let array = defaults.arrayforkey("recomquery")     in 0..<10  {     let videourl = "https://www.googleapis.com/youtube/v3/videos?part=contentdetails%2c+snippet&id=\(array![i])&maxresults=10&key=\(apikey)"      alamofire.request(.get, videourl).validate().responsejson { response in         switch response.result {         case .success:             print("success") //this not being called             if let value = response.result.value {                 let json = json(value)                 let videotitle = json["items"][0]["snippet"]["title"].stringvalue                 print("title network \(videotitle)")                 let thumbpath = string(json["items"][0]["snippet"]["thumbnails"]["default"]["url"])                 print(i)                 let image = uiimage(data: nsdata(contentsofurl: nsurl(string: thumbpath)!)!)!                 let newimage: nsdata = uiimagepngrepresentation(image)!                 self.recomtitles.append(videotitle)                 self.recomthumbs.append(newimage)             }         case .failure(let error):             print("failure") //this not being called             print(error)             completion(result: "done")             }         }     } print("saving array: \(defaults.arrayforkey("recomtitles"))") defaults.setobject(recomthumbs, forkey: "recomthumbs") defaults.setobject(recomtitles, forkey: "recomtitles") completion(result: "done") } 

thanks in advance!

if run in playground, chances program ends before print called, because call async method. if that's case, call xcpexecutionshouldcontinueindefinitely() @ beginning.