enumerate_enumeration.swift

/*
Convenient way to enumerate an enum, see also:
http://www.swift-studies.com/blog/2014/6/10/enumerating-enums-in-swift
http://www.wooji-juice.com/blog/stupid-swift-tricks-5-enums.html
https://gist.github.com/erica/b849cef7fcd123756373

Sabino Paulicelli
*/

protocol SmartEnum {
  static var allValues: [Self] { get }
}

extension SmartEnum where Self: RawRepresentable, Self.RawValue == Int {
  static var allValues: [Self] {
    var result: [Self] = []
    var value = 1
    while let item = Self(rawValue: value) {
      result.append(item)
      value += 1
    }
    return result
  }
}

enum Rank: Int, CustomStringConvertible, SmartEnum {
  case Ace = 1
  case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten
  case Jack, Queen, King
  var description: String {
    return ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"][rawValue-1]
  }
}

for i in Rank.allValues {
  print(i)
}

for (i, j) in Rank.allValues.enumerate() {
  print(i, j)
}