scala> val examplelist = List(1, 2, 3, 4, 5)
examplelist: List[Int] = List(1, 2, 3, 4, 5)


scala> examplelist.map(x => List(x*x))
res1: List[List[Int]] = List(List(1), List(4), List(9), List(16), List(25))


scala> examplelist.flatMap(x => List(x*x))
res4: List[Int] = List(1, 4, 9, 16, 25)