Input and output parameters

var currentSeason = "Winter"
func season(month: Int, name: inout String) {
  switch month {
    case 1...2:
      name = "Winter ⛄️"
    case 3...6:
      name = "Spring 🌱"
    case 7...9:
      name = "Summer ⛱"
    case 10...11:
      name = "Autumn 🍂"
    default:
      name = "Unknown"
  }
}
season(month: 4, name: &currentSeason)
print(currentSeason) // Spring 🌱