Colección inmutable - Queue
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object Main extends App {
val empty = scala.collection.immutable.Queue[Int]()
println(empty)
val has1 = empty.enqueue(1)
println(has1)
val has123 = has1.enqueue(List(2, 3))
val (element, has23) = has123.dequeue
println(has23)
println(has123)
}
Scala
INFO