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

// 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

// 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)

Scala Queue ++:() method with example

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