swift-snippet-11.swift

extension RawRepresentable where RawValue == Int {
  
  static var itemsCount: Int {
    var index = 0
    while Self(rawValue: index) != nil { index += 1 }
    return index
  }
  
  static var items: [Self] {
    var items: [Self] = []
    var index = 0
    while let item = Self(rawValue: index) {
      items.append(item)
      index += 1
    }
    return items
  }
  
}