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Scala Queue +:() method with example
  • Last Updated : 18 Oct, 2019

The +:() method is utilized to return a new queue with an element added at the front of the given queue.

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

Return Type: It returns a new queue with an element added at the front of the given queue.

Example #1:

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// 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"
          
        // Applying +:() method 
        val result = q1.+:("geeks")
          
        // Display output
        print(result)   
          
    

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Output:

Queue(geeks, for, geeks)

Example #2:

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// 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(2, 3, 4, 5, 6
          
        // Applying +:() method 
        val result = q1.+:(1)
          
        // Display output
        print(result)   
          
    

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Output:

Queue(1, 2, 3, 4, 5, 6)



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