Swift - Expected expression in list of expressions - ios

Question

I'm new to Swift been reading but have no clue what this means. On the line of code below, I have "Expected expression in list of expressions" after parameters[String]. AS well at the same point it is looking for "Expected ',' separator. I believe these are related.
AppDelegate.submitLacunaRequest(module: "empire", method: "login", parameters[String]:["myuserid", "mypassword", "mykey"]) {
responseObject, error in
// some network error or programming error
if error != nil {
println("error = \(error)")
println("responseObject = \(responseObject)")
return
}
// network request ok, now see if login was successful
if let responseDictionary = responseObject as? NSDictionary {
if let errorDictionary = responseDictionary["error"] as? NSDictionary {
println("error logging in (bad userid/password?): \(errorDictionary)")
} else if let resultDictionary = responseDictionary["result"] as? NSDictionary {
println("successfully logged in, refer to resultDictionary for details: \(resultDictionary)")
} else {
println("we should never get here")
println("responseObject = \(responseObject)")
}
}
}
Here is the related code from AppDelegate
public func submitLacunaRequest (#module: String, method: String, parameters: AnyObject, completion: (responseObject: AnyObject!, error: NSError!) -> (Void)) -> NSURLSessionTask? {
let session = NSURLSession.sharedSession()
let url = NSURL(string: "https://us1.lacunaexpanse.com")?.URLByAppendingPathComponent(module)
let request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "POST"
request.setValue("application/json-rpc", forHTTPHeaderField: "Content-Type")
let requestDictionary = [
"jsonrpc" : "2.0",
"id" : 1,
"method" : "login",
"params" : ["myuserid", "mypassword", "mykey"]
]
var error: NSError?
let requestBody = NSJSONSerialization.dataWithJSONObject(requestDictionary, options: nil, error: &error)
if requestBody == nil {
completion(responseObject: nil, error: error)
return nil
}
request.HTTPBody = requestBody
let task = session.dataTaskWithRequest(request) {
data, response, error in
// handle fundamental network errors (e.g. no connectivity)
if error != nil {
completion(responseObject: data, error: error)
return
}
// parse the JSON response
var parseError: NSError?
let responseObject = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: &parseError) as? NSDictionary
if responseObject == nil {
// because it's not JSON, let's convert it to a string when we report completion (likely HTML or text)
let responseString = NSString(data: data, encoding: NSUTF8StringEncoding) as String
completion(responseObject: responseString, error: parseError)
return
}
completion(responseObject: responseObject, error: nil)
}
task.resume()
return task
}

Answer 1

You are using external parameter name for a parameter when calling the function, but the external parameter is not defined in your function declaration. Simply use it this way.
submitLacunaRequest(module: "empire", "login", ["myuserid", "mypassword", "mykey"]) {

Answer 2

You're calling the function incorrectly. You don't need the [String] in the parameters param...
AppDelegate.submitLacunaRequest(module: "empire", method: "login", parameters: ["myuserid", "mypassword", "mykey"]) {
...
}

Answer 3

I called my function parameter protocol.
If I was to try using this property as usual, I would notice it to be written in pink being a keyword and I would rename it.
Instead, I used this property in a string like this and I didn't get any clues from the compiler:
func configure(_ protocol: Protocol, host:String, port:String) {
urlString = "\(protocol)://\(host):\(port)"
}
I spend good 5 minutes confused out of my mind by this error, but then I figured it out. The problem was in the name of the parameter.
I didn't want to rename the parameter, so I ended up writing it like this:
urlString = "\(`protocol`)://\(host):\(port)"