计算任何项目在Scala列表中显示的次数

Question

我有以下列表:

val list = List("this", "this", "that", "there", "here", "their", "where")

我想计算"这个"或"那个"出现多少次.我可以这样做:

 list.count(_ == "this") + list.count(_ == "that")

有最简洁的方法吗？

Answer 1

您一次可以count多次出现.无需拨打count两次电话.

scala> list.count(x => x == "this" || x == "that")
res4: Int = 3