scala - StringOps.split(String，Int)中第二个参数的含义

Question

我试图拆分一个字符串并保留空字符串。幸运的是，我找到了一个有前途的解决方案，它给了我预期的结果，如下REPL session 所述:

scala> val test = ";;".split(";",-1)
test: Array[String] = Array("", "", "")

我很好奇第二个参数实际上是做什么的，并深入到 scala documentation中，但除了以下内容外，什么都没有找到:

同样在REPL解释器中，我仅获得以下信息:

scala> "asdf".split

标签

def split(String): Array[String]        
def split(String, Int): Array[String]

问题
有人针对这些记录不良的参数有其他文献来源吗？
还是有人可以解释这个2dn参数对这个特定功能的作用？

Answer 1

这是与split相同的java.lang.String，碰巧它具有更好的documentation:

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter. If n is non-positive then the pattern will be applied as many times as possible and the array can have any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.