ios - Swift Array(string) not working -

i'm trying make hangman game. i'm going paste code in because feel problem somewhere in here i'm not seeing. down , find part wrote error occurs. here error message get: missing argument label 'arrayliteral' in call. when add arrayliteral code not work. i'm new swift appreciated! thank you! (sorry there's lot of code that's unrelated issue)

import uikit  class viewcontroller: uiviewcontroller, uitextfielddelegate {      @iboutlet weak var secret_word_label: uilabel!     @iboutlet weak var guess_field: uitextfield!     @iboutlet weak var submit_button: uibutton!      //only bug testing     @iboutlet weak var arb_print: uilabel!     @iboutlet weak var print_secret: uilabel!      var user_guesses = [string]()      var secret_word = "asdf"      var wrong_guesses = 0      var guess_letter = ""      var correct_guesses = 0      let limit_wrongs = 3      var secret_word_loc = [string]()       func return_len(text: string) -> int {          var final = [string]()          var loc = array(text)          letter in loc {              if !contains(final, string(letter)) {                  final.append(string(letter))                  }          }          return final.count      }       func gen_secret_word() -> string {          var random_num = arc4random_uniform(4)          var words = ["hello","world","iphone","apple"]          return words[int(random_num)]      }       func start_game(action: uialertaction! = nil) {          secret_word = gen_secret_word()          print_secret.text = secret_word          secret_word_label.text = dashes_except(secret_word,except: "1")          error occurs <           secret_word_loc = array(secret_word)           >         user_guesses = [string]()          correct_guesses = 0          wrong_guesses = 0        }       func dashes_except(word: string,except: string) -> string {          var loc = [string]()          (index, character) in enumerate(word) {              loc.append(string(character))          }          var loc_except = [string]()          (index, character) in enumerate(except) {              loc_except.append(string(character))          }          x in 0..<loc.count {              if !contains(loc_except, loc[x]) {                  loc[x] = "-"              }          }          return "".join(loc)      }       func textfieldshouldreturn(textfield: uitextfield!) -> bool {          textfield.resignfirstresponder()          return true      }       @ibaction func submit_engaged(sender: uibutton) {          guess_letter = guess_field.text          if contains(user_guesses, guess_letter) {              var nuttin = "well nuttin"          }          else if contains(secret_word_loc, guess_letter) {              correct_guesses += 1              user_guesses.append(guess_letter)          } else {              wrong_guesses += 1              user_guesses.append(guess_letter)          }            arb_print.text = "".join(user_guesses)          secret_word_label.text = dashes_except(secret_word,except: "".join(user_guesses))          if correct_guesses == return_len(secret_word) {              //give alert won , ask continue play again , put how many guesses took them               let ac = uialertcontroller(title: "you won", message: "congrats. took \(wrong_guesses + correct_guesses) tries", preferredstyle: .alert)              ac.addaction(uialertaction(title: "play again", style: uialertactionstyle.default, handler: start_game))              presentviewcontroller(ac, animated: true, completion: nil)           }          else if wrong_guesses == limit_wrongs {              //give alert lost , ask continue play again , give word              let ac = uialertcontroller(title: "you lost", message: "the word \(secret_word)", preferredstyle: .alert)              ac.addaction(uialertaction(title: "play again", style: uialertactionstyle.default, handler: start_game))              presentviewcontroller(ac, animated: true, completion: nil)          }              }       override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.          guess_field.delegate = self          start_game()      }       override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }   } 

because declared secret_word_loc type of array<string>, , array<secret_word> type of array<character>. either declare var secret_word_loc = [character]() or secret_word_loc = map("secret_word") {string($0)} convert each character in secret_word string , put them in array.