Scala Stack /:() method with example

In Scala, scala.collection.mutable implements Stack data structure. The /: method applies a binary operator to a start value and all elements of this traversable or iterator, going left to right.

Method Definition – def /:[B](z: B)(op: (B, A) ? B): B

Returns – the result of inserting op between consecutive elements of this traversable or iterator.

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])
    {


        val st1 = Stack(1, 2, 3)


        // Applying /:() method
        val result1 = (16 /: st1)(_+_)
        val result2 = (16 /: st1)(_-_)

        // Display output
        print(result1)
        print("\n")
        print(result2)

    }
}

Output:

22
10

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])
    {
        // Creating a stack
        val q2 = List(11, 12, 13, 14, 15)

        // Applying /:() method
        val result = (6 /: q2)(_+_)

        // Display output
        print(result)

    }
}

Output:

71