Can not pick random number from Array in swift

Question

I have this code and I want to pick a random element from Array1 and a random element from Array2 but Xcode is only giving me the number of the element.

let firstNrVar = [0, 2, 4, 6, 8, 10]
let secondNrVar = [0, 2, 4, 6, 8, 10]
func numberRandomizer() {
    let shuffledFirstNr = Int(arc4random_uniform(UInt32(firstNrVar.count)))
    firstNrLbl.text = "\(shuffledFirstNr)"
    print(shuffledFirstNr)
    let shuffledSecondNr = Int(arc4random_uniform(UInt32(secondNrVar.count)))
    secondNrLbl.text = "\(shuffledSecondNr)"
    print(shuffledSecondNr)
}

Am I understanding you correctly, you're trying to access the array's value? This would be as easy as let firstValue = firstNrVar[shuffledFirstNr] Your label would then be set via firstNrLbl.text = "\(firstValue)" Currently, you're only getting a random index, not the array's value at that index. — Jonas W
– Jonas W, Commented Feb 26, 2018 at 19:16
No, I want it to pick up randomly an element from the Array {firstNrVar}, and another random element from the Array {secondNrVar}. That's mean the number must be 0, 2, 4, 6, 8 or 10, but xCode is counting where the number is and printing it out. — Mk Berou
– Mk Berou, Commented Feb 26, 2018 at 19:20
Yup, that's what I thought. With your current code, you are generating a random index, which you can use to access an array's value at that index. That you could do as mentioned above. — Jonas W
– Jonas W, Commented Feb 26, 2018 at 19:23
Xcode is only giving... Xcode has nothing to do with it -- it's your code. — Caleb
– Caleb, Commented Feb 26, 2018 at 19:37

Iraniya Naynesh · Accepted Answer · 2018-02-26 19:22:55Z

1

you have to get the random index between 0 and array count and then get the value at that random index and then set that value to the text

func numberRandomizer() {
  let shuffledFirstIndex = Int(arc4random_uniform(UInt32(firstNrVar.count)))
  firstNrLbl.text = "\(firstNrVar[shuffledFirstIndex])"
  print("\(firstNrVar[shuffledFirstIndex])")
  let shuffledSecondIndex = Int(arc4random_uniform(UInt32(secondNrVar.count)))
  secondNrLbl.text = "\(secondNrVar[shuffledSecondIndex])"
  print("\(secondNrVar[shuffledSecondIndex])")
}

answered Feb 26, 2018 at 19:22

Iraniya Naynesh

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Arturo Lee · Accepted Answer · 2018-02-26 19:25:29Z

1

Just get the values using the number of the element.

let value = firstNrVar[shuffledFirstNr]
firstNrLbl.text = "\(value)"

let secondValue = secondNrVar[shuffledSecondNr]
secondNrLbl.text = "\(secondValue)"

answered Feb 26, 2018 at 19:25

Arturo Lee

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