I have a Scala List, how can I get a TraversableOnce?

Question

Starting with a Scala list.

val list = List(1,2,3,4)

How can I convert it to a TraversableOnce?

Answer 1

You already have one, since List[A] is a subtype of TraversableOnce[A]. You should not need to do anything to convert it.

To verify this:

scala> implicitly[List[Int] <:< TraversableOnce[Int]]
res0: <:<[List[Int],TraversableOnce[Int]] = <function1>