Scala Stack :+() method with example

In Scala, scala.collection.mutable implements Stack data structure. The :+ method is used to create a copy of this stack with an element appended.

Method Definition – def :+(elem: A)

Returns – a new stack consisting of all elements of this stack followed by elem.

Example #1:

// 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 q2 = List(11, 12, 13, 14, 15)

        // Applying :+() method
        val result = q2 :+ 100

        // Display output
        print(result)

    }
}

Output:

List(11, 12, 13, 14, 15, 100)

Example #2:

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

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

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {


        val st1 = Stack(1, 2, 3)
        val st2 = Stack("Geeks", "For")


        // Applying :+() method
        val result1 = st2 :+ st1


        // Display output
        print(result1)

    }
}

Output:

Stack(Geeks, For, Stack(1, 2, 3))