Scala Queue +=:() method with example

Scala Queue ++:() method with example

Last Updated : 24 Oct, 2019

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)

Scala Queue +=:() method with example

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