title: Cannot subscript a value of type [String] with an index of type "UInt32"
body: <p>i've been trying to create a code to generate random names. Here it is</p>
  
  <pre><code>import UIKit
  
   let arrayOfNames: [String] = ["Giovanni", "Simone", "Francesco", "Ahmet",       "Valerio", "Federico"]
  
   let arrayOfsNames: [String] = [" İl Genio", " Lo scemo", " Verga", " Fermi", " Medici", " L'assasino"]
  
   var casual1 = arc4random_uniform(7)
   var casual2 = arc4random_uniform(7)
  
   let name = "\(arrayOfNames[casual1]) + \(arrayOfsNames[casual2])"
  
    name
  </code></pre>
  
  <p>however on the "let name" line it gives me the mistake on the title. Does anyone know why and how to solve it?</p>