Examples on how Option is handled neatly

Scala Option handling

// Map and flatMap for Options/Lists

scala> val myList : List[Option[Int]] = List(Some(1), None, Some(2))
myList: List[Option[Int]] = List(Some(1), None, Some(2))

scala> myList.flatten.map(x=>x*2)
res15: List[Int] = List(2, 4)

scala> myList.flatMap((x) => x.map(_*2))
res16: List[Int] = List(2, 4)

// For comprehension

scala> val listWithOptions: List[Option[Int]] = List(Some(1), None, Some(2))
listWithOptions: List[Option[Int]] = List(Some(1), None, Some(2))

scala> for (theOpt <- listWithOptions; theInt <- theOpt) yield theInt
res29: List[Int] = List(1, 2)

// Now, let's add more nesting!

scala> val deeplyNested: List[List[Option[Int]]] = List(List(None, None, Some(1)), List(), List(Some(2), Some(3)))
deeplyNested: List[List[Option[Int]]] = List(List(None, None, Some(1)), List(), List(Some(2), Some(3)))

scala> for (nestedList <- deeplyNested; theOption <- nestedList; theInt <- theOption) yield theInt
res31: List[Int] = List(1, 2, 3)