在开关中使用 where 语句

where 语句可以在 switch case 匹配中使用,以添加正匹配所需的其他条件。以下示例不仅检查范围,还检查数字是奇数还是偶数:

switch (temperature) {
      case 0...49 where temperature % 2 == 0:
        print("Cold and even")

      case 50...79 where temperature % 2 == 0:
        print("Warm and even")

      case 80...110 where temperature % 2 == 0:
        print("Hot and even")

      default:
        print("Temperature out of range or odd")
}