Scala Stack :+() method with example

Scala Stack +:() method with example

Last Updated : 02 Nov, 2019

In Scala, scala.collection.mutable implements Stack data structure. The +: method is similar to ++ method in Stack which gives a copy of the stack with an element prepended. Note that the ending operators are right associative.

Method Definition - def +:(elem: A) Returns - A new stack consisting of elem followed by all elements of this stack.

Example #1:

SCALA

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

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

// Creating object 
object GfG 
{ 

    // Main method 
    def main(args:Array[String]) 
    { 
        // Creating a value 
        val q1 = 1
        
        val q2 = Stack("for", "geeks") 
        
        // Applying +:() method 
        val result = q1 +: q2
            
        // Display output 
        print(result) 
        
    } 
}

Output:

Stack(1, for, geeks)

Example #2:

SCALA

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

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

// Creating object 
object GfG 
{ 

    // Main method 
    def main(args:Array[String]) 
    { 
        // Creating a stack 
        val q1 = List(1 )
        
        val q2 = List(11, 12, 13, 14, 15) 
        
        // Applying ++() method 
        val result = q1.+:(q2) 
            
        // Display output 
        print(result) 
        
    } 
}

Output:

List(List(11, 12, 13, 14, 15), 1)

Scala Stack :+() method with example

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