减少Scala中的循环？

发布时间：2020-12-16 09:03:42 所属栏目：安全来源：网络整理

导读：第一天和第一次尝试使用 Scala – 所以对我来说很容易！我正在尝试重写一些旧的 Java代码,它只是一个函数,它接受两个数字并打印出从x到y的数字.例如,我有增量功能： def increment(start: Int,finish: Int) = { for (i - start to finish) { println("Curren

第一天和第一次尝试使用 Scala – 所以对我来说很容易！我正在尝试重写一些旧的 Java代码,它只是一个函数,它接受两个数字并打印出从x到y的数字.例如,我有增量功能：

def increment(start: Int,finish: Int) = {
      for (i <- start to finish) {
         println("Current value (increasing from "+start+" to "+finish+") is "+i)
      }
    }

然而,我正在努力写一个相应的减量函数,从开始到结束将减少？我读过Scala downwards or decreasing for loop?但仍然不确定

谢谢

解决方法

scala>def decrement(start: Int,finish: Int) = {
    |  for (i <- start to finish by -1)
    |   println("Current value (decreasing from "+start+" to "+finish+") is "+i);
    | }
decrement: (start: Int,finish: Int)Unit

scala> decrement(10,1)
Current value (decreasing from 10 to 1) is 10
Current value (decreasing from 10 to 1) is 9
Current value (decreasing from 10 to 1) is 8
Current value (decreasing from 10 to 1) is 7
Current value (decreasing from 10 to 1) is 6
Current value (decreasing from 10 to 1) is 5
Current value (decreasing from 10 to 1) is 4
Current value (decreasing from 10 to 1) is 3
Current value (decreasing from 10 to 1) is 2
Current value (decreasing from 10 to 1) is 1

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!