swift - Saving Alamofire request data into a variable -

i'm having troubles getting password salt vm server via alamofire. i'm making request server , should return me salt, can salt password, hash , send server.

the problem not understand how save salt, alamofire receives, variable, can add password , hash that:

let salted_password = user_password + salt let hash = salted_password.sha1() 

where user_password user entered password field , salt got alamofire salt request.

here code:

func getsalt(completionhandler: @escaping (dataresponse<string>, error?) -> void) {          alamofire.request("http://192.168.0.201/salt", method: .post, parameters: salt_parameters).responsestring { response in          switch response.result {         case .success(let value):             completionhandler(response dataresponse<string>, nil)         case .failure(let error):             completionhandler("failure", error)             }         }     }      let salt = getsalt { response, responseerror in          return response.result.value!     } 

it gives me following error:

binary operator '+' cannot applied operands of type 'string' , '()'. 

so possible save request value variable? should do?

thank attention.

the problem here because of how implemented completion block

for example:

func someasynchronouscall(a: int, b: int, @escaping block: (_ result: int) -> void) {     ... code here     ... {          // let's async call done , code called after call done         block(a + b)     } } 

to use code this:

var answer: int = 0 someasynchronouscall(100, b: 200) { result in // `result` you're returning user since api calls need called asynchronously rather creating function has default return type.     answer = result     print(answer) } print(answer) 

the print this

0 300 

since declared answer 0 printed first since async call wasn't done yet, after async call done (usually few milliseconds after) printed 300

so in code should this

var salt: string? getsalt { response, responseerror in      salt = response.result.value  }