scala Option

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scala> val a = "a"
a: String = a

scala> Option(a)
res13: Option[String] = Some(a)

scala> 

scala> Option(a).exists(_ == "a")
res14: Boolean = true

scala> Option(a).exists(_ == "b")
res15: Boolean = false

ifをいれてみる

scala> if (Option(a).exists(_ == "a"))
     | println("ok")
ok

scala> if (Option(a).exists(_ == "b"))
     | println("ok")

scala>