Scala检查List是否包含其他List的元素片

Question

A : List[String] 
B : List[String]

我想知道List B的任何元素是否是列表A的任何元素的片段.

什么是最快的检查方式？

Answer 1

谁最快？对于你或CPU？

scala> val a = List("abc","def","ghi") ; val b = List("xy", "yz", "ef")
a: List[String] = List(abc, def, ghi)
b: List[String] = List(xy, yz, ef)

scala> b exists (s => a exists (_ contains s))
res0: Boolean = true

scala> val a = List("abc","def","ghi") ; val b = List("xy", "yz")
a: List[String] = List(abc, def, ghi)
b: List[String] = List(xy, yz)

scala> b exists (s => a exists (_ contains s))
res1: Boolean = false

Answer 2

我认为最简单的方法是：ListA.exists {ListB.contains}