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val list1 = List(1,2)
val list2 = List(3,4)
then
list1::list2 returns:
List[Any] = List(List(1, 2), 3, 4)
list1:::list2 returns:
List[Int] = List(1, 2, 3, 4)
I saw the book writes that when use :: it also results List[Int] = List(1, 2, 3, 4). My Scala version is 2.9.
::prepends a single item whereas:::prepends a complete list. So, if you put aListin front of::it is taken as one item, which results in a nested structure.