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Convert a List into an Option if it is populated

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I have a method that should convert a list to an Option of an object, or None if the list is empty.

def listToOption(myList: List[Foo]): Option[Bar] = {   if(myList.nonEmpty) Some(Bar(myList))   else None }  case class Bar(fooList: List[Foo]) {} 

For some reason, my solution feels rather inelegant, and not the Scala way. It seems I should be able to use a method on List to do this sort of thing, but I can't wrap my head around it.

Is there a more Scala-like way to do this?

like image 455
Cory Klein Avatar asked Jan 30 '15 20:01

Cory Klein


1 Answers

Lee's answer is good, but I think this corresponds to the intention a bit more clearly:

Option(myList).filter(_.nonEmpty).map(Bar) 
like image 191
Alexey Romanov Avatar answered Oct 21 '22 00:10

Alexey Romanov