How to find out if letter is Alphanumeric or Digit in Swift

Question

I want to count the number of letters, digits and special characters in the following string:

let phrase = \"The final score was 32-31!\"

I

Answer 1

I've created a short extension for letter and digits count for a String

extension String {
  var letterCount : Int {
    return self.unicodeScalars.filter({ CharacterSet.letters.contains($0) }).count
  }

  var digitCount : Int {
   return self.unicodeScalars.filter({ CharacterSet.decimalDigits.contains($0) }).count
  }
}

or a function to get a count for any CharacterSet you put in

extension String {    
  func characterCount(for set: CharacterSet) -> Int {
    return self.unicodeScalars.filter({ set.contains($0) }).count
  }
}

usage:

let phrase = "the final score is 23-13!"
let letterCount = phrase.characterCount(for: .letters)