如何漂亮地打印scala中Option返回的值？

Question

I have a function which returns an "Option[myDataStructure]. When I call this from Zeppelin notebook, it says that it cannot call "show()" on the value as it of type "option". Is there any other way using which I can pretty print my returned value as a dataset? Printing using println is really clumsy.

val returnValue: Option[myDataStructure] = myFunction(a,b)
returnValue.show(10,false)

Answer 1

You can use foreach to perform side-effecting action on Option :

returnValue.foreach(_.show(10,false))

It will only run if the Option is Some and therefore it's safer than calling get which may throw java.util.NoSuchElementException in the case when Option is None .

Answer 2

您可以通过使用get获得Option中的值

returnValue.get.show(10,false)