How to find the average of just the user inputs above 0 - ios

Question

so I'm trying to find the average of my results using only user inputed values above 0. I'm not sure how I would check the results in the array to find out which values are above 0 and exclude them from the calculation in swift.
class ViewController: UIViewController {
#IBOutlet weak var game1: UITextField!
#IBOutlet weak var game2: UITextField!
#IBOutlet weak var game3: UITextField!
#IBOutlet weak var series: UILabel!
#IBOutlet weak var average: UILabel!
#IBOutlet weak var high: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func calculate(_ sender: Any) {
self.view.endEditing(true)
guard
let text1 = game1.text,
let text2 = game2.text,
let text3 = game3.text
else { return }
guard
let game1Results = Int(text1),
let game2Results = Int(text2),
let game3Results = Int(text3)
else { return }
let gameResultsArray = [game1Results, game2Results, game3Results]
let sumArray = gameResultsArray.reduce(0, +)
let avgArrayValue = sumArray / gameResultsArray.count
series.text = "\(sumArray)"
average.text = "\(avgArrayValue)"
if let maximumVal = gameResultsArray.max() {
high.text = String(maximumVal)
}
}
}

Answer 1

To filter out all values above 0 in an array, use the filter method. This will return a subset of your original array with all values passing the condition declared inside -
var demoArray = [-1, -8, 0, 1, 5 ,6]
var positiveArray = demoArray.filter { (item: Int) -> Bool in
return item > 0
}
print(positiveArray) // [1, 5, 6]

Answer 2

simply you can use filter
..
let sumArray = gameResultsArray.filter({$0 > 0})
let avgArrayValue = sumArray.reduce(0, +) / sumArray.count