| | | Queues | Contents |
Scala provides mutable queues in addition to immutable ones. You use a mQueue similarly to how you use an immutable one, but instead of enqueue, you use the += and ++= operators to append. Also, on a mutable queue, the dequeue method will just remove the head element from the queue and return it. Here's an example:
scala> val queue = new scala.collection.mutable.Queue[String]
queue: scala.collection.mutable.Queue[String] = Queue()
scala> queue += "a"
res10: queue.type = Queue(a)
scala> queue ++= List("b", "c")
res11: queue.type = Queue(a, b, c)
scala> queue
res12: scala.collection.mutable.Queue[String]
= Queue(a, b, c)
scala> queue.dequeue
res13: String = a
scala> queue
res14: scala.collection.mutable.Queue[String] = Queue(b, c)
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