errors while trying to compare a string to element in array

Question

    let verbList: [String] = ["hacer", "ser", "estar"]
let POVList: [String] = ["él / usted","ella / usted","ellas / ustedes","ellos / ustedes","tú","yo","nosotros",]
let correctConjugation: [[String]] = [["hace","hace","hacen","hacen","haces","hago","hacemos"], ["es","es","son","son","eres","soy","somos"], ["está","está","estan","estan","estas","estoy","estamos"]]


func randomVerb() -> Int {                          //creates and returns a random number for the prefix arrray
    var randomVerb = Int(arc4random_uniform(3))
    return randomVerb
}

func randomPrefix() -> Int {                        //creates and returns a random number for the verb array
    var randomPrefix = Int(arc4random_uniform(7))
    return randomPrefix
}


@IBAction func changeVerb(sender: AnyObject) {

    Verb.text = verbList[randomVerb()]
    POV.text = POVList[randomPrefix()]

    userResponse.backgroundColor = UIColor.whiteColor()
    userResponse.text = ""


}


@IBAction func checkResponse(sender: AnyObject) {

    var userResponseA: String
    userResponseA = userResponse.text
    if (userResponseA == correctConjugation[randomVerb()[randomPrefix()]]){
        userResponse.backgroundColor = UIColor.greenColor()
    } else {
        userResponse.backgroundColor = UIColor.redColor()
    }

}

So I get two errors here (in the if statement in checkResponse): first, "int does not have a member named 'subscript'" and if I just take out the call for the function in the if statement I get: "'String' is not convertible to 'Mirror Disposition'"

I really have no idea why this is not working. Bear with me, as I am an Xcode noob just trying to get a better grade in spanish.

This isn't about the problem you're having, but the way you have that set up you're showing a random pair, then testing against a newly generated random pair in checkResponse(). — Nate Cook
– Nate Cook, Commented Nov 13, 2014 at 2:20
Oh darn so in other words this won't work... could I create a variable in the random # generator functions to store the random number and return that variable to check the response? — elise
– elise, Commented Nov 13, 2014 at 2:33
Just add two vars up by your lists, and set them from changeVerb(). I'll add to my answer below... — Nate Cook
– Nate Cook, Commented Nov 13, 2014 at 2:34
Having variable at the instance level lets them be accessible from all your different functions - see my update below. — Nate Cook
– Nate Cook, Commented Nov 13, 2014 at 2:38

Nate Cook · Accepted Answer · 2014-11-13 02:37:20Z

1

Very close - just need to have your subscripts separated:

if (userResponseA == correctConjugation[randomVerb()][randomPrefix()]) {
    // ...
}

When working with an array of arrays (in this case correctConjugation), each subscript takes you one level down.

For the other issue, you want a couple variables to hold the current verb and prefix indexes:

class VC: UIViewController {
    // list declarations here
    var verbIndex = 0
    var povIndex = 0

    @IBAction func changeVerb(sender: AnyObject) {
        verbIndex = randomVerb()
        povIndex = randomPrefix()

        Verb.text = verbList[verbIndex]
        POV.text = POVList[povIndex]

        userResponse.backgroundColor = UIColor.whiteColor()
        userResponse.text = ""
    }

    @IBAction func checkResponse(sender: AnyObject) {
        var userResponseA = userResponse.text

        if (userResponseA == correctConjugation[verbIndex][povIndex]){
            userResponse.backgroundColor = UIColor.greenColor()
        } else {
            userResponse.backgroundColor = UIColor.redColor()
        }
    }
}

edited Nov 13, 2014 at 2:37

answered Nov 13, 2014 at 2:15

Nate Cook

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3 Comments

elise Over a year ago

That fixed that - I didn't know each subscript took you into the next dream. thanks

elise Over a year ago

hmm so I think I'm following you and we are storing the random values to use them to check the user response (which makes total sense) but the program still is not recognizing when the userResponseA = correctConjugation. Could I be referencing the wrong parts of the array? So for example if "el" and "ser" is generated, the correctConjugation should reference "es"

elise Over a year ago

Wait never mind I typed it in wrong :0... Thank you!

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