本文介绍了将字符串拆分为组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试将一个字符串分组"成段,我想这个例子会更简洁地解释它
I'm trying to 'group' a string into segments, I guess this example would explain it more succintly
scala> val str: String = "aaaabbcddeeeeeeffg" ... (do something) res0: List("aaaa","bb","c","dd","eeeee","ff","g")我可以想到几种以命令式风格执行此操作的方法(使用 vars 并逐步遍历字符串以查找组),但我想知道是否有更好的功能解决方案可以能达到吗?我一直在浏览 Scala API,但似乎没有适合我需要的东西.
I can thnk of a few ways to do this in an imperative style (with vars and stepping through the string to find groups) but I was wondering if any better functional solution could be attained? I've been looking through the Scala API but there doesn't seem to be something that fits my needs.
任何帮助将不胜感激
推荐答案可以用span递归拆分字符串:
You can split the string recursively with span:
def s(x : String) : List[String] = if(x.size == 0) Nil else { val (l,r) = x.span(_ == x(0)) l :: s(r) }尾递归:
@annotation.tailrec def s(x : String, y : List[String] = Nil) : List[String] = { if(x.size == 0) y.reverse else { val (l,r) = x.span(_ == x(0)) s(r, l :: y) } }更多推荐
将字符串拆分为组
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