Scala Queue ++:() method with example

The ++:() method is utilized to return a new queue with all the elements of the queue appended at the front of another queue.

Method Definition: def ++:[B >: A](prefix: IterableOnce[B]): Queue[B]

Return Type: It returns a new queue with all the elements of the queue appended at the front of another queue.

Example #1:

// Scala program of ++:()
// method

// Import Queue
import scala.collection.mutable._

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {
        // Creating a queue
        val q1 = Queue(1, 2, 3, 4, 5)

        val q2 = Queue(11, 12, 13, 14, 15)

        // Applying ++:() method
        val result = q1.++:(q2)

        // Display output
        print(result)

    }
}

Output:

Queue(11, 12, 13, 14, 15, 1, 2, 3, 4, 5)

Example #2:

// Scala program of ++:()
// method

// Import Queue
import scala.collection.mutable._

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {
        // Creating a queue
        val q1 = Queue("for", "geeks")

        val q2 = Queue("geeks")

        // Applying ++:() method
        val result = q1.++:(q2)

        // Display output
        print(result)

    }
}

Output:

Queue(geeks, for, geeks)