What is the modulus operator (%) in swift 3?

Question

I have this line:

randomIndex = Int(drand48() % Double(alphabetColors.count))

And Xcode 8 (Swift 3) tells me:

'%' is unavailable: Use truncatingRemainder instead

Is there no operator anymore? How should I convert my code?

Answer 1

You can simply follow the diagnostic message:

let randomIndex = Int(drand48().truncatingRemainder(dividingBy: Double(alphabetColors.count)))

Or using arc4random_uniform(_:) would be a better alternative.

let randomIndex = Int(arc4random_uniform(UInt32(alphabetColors.count)))