具有相同相邻值的Scala列表

Question

我有这个 list :

List("Black","Black","Green","White")

如何检查列表是否有两个相同的相邻值？像这样:

List("Black","Black","Green","White") true

List("Black","Yellow","Green","White") false

List("Black","Yellow","Black","Yellow") false

Answer 1

除了Valy Dia的解决方案，你还可以这样写:

list.sliding(2).exists(_.distinct.size == 1)

REPL session

scala> def check[A](l: Seq[A]): Boolean = l.sliding(2).exists(_.distinct.size == 1)
check: [A](l: Seq[A])Boolean

scala> check("A" :: "B" :: Nil)
res0: Boolean = false

scala> check("A" :: "B" :: "B" ::Nil)
res1: Boolean = true

scala> check("A" :: "B" :: "C":: "B" ::Nil)
res2: Boolean = false