Scala Stack filter() method with example

In Scala Stack class, the filter() method is utilized to return a new stack that consists of all the elements that satisfy a given predicate.

Method Definition: def filter(pred: (A) => Boolean): Stack[A]

Return Type: It returns a new stack that consists of all the elements that satisfy a given predicate.

Example #1:

// Scala program of filter()
// method

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

// Creating object
object GfG
{

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

        // Creating stack
        val s1 = Stack(1, 3, 2, 7, 6, 5)

        // Print the stack
        println(s1)

        // Applying filter method
        val result = s1.filter(x => {x % 2 == 1})

        // Display output
        println("Odd elements: " + result)
    }
}

Output:

Stack(1, 3, 2, 7, 6, 5)
Odd elements: Stack(1, 3, 7, 5)

Example #2:

// Scala program of filter()
// method

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

// Creating object
object GfG
{

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

        // Creating stack
        val s1 = Stack(1, 3, 2, 7, 6, 5)

        // Print the stack
        println(s1)

        // Applying filter method
        val result = s1.filter(x => {x % 3 == 0})

        // Display output
        println("Elements divisible by 3: " + result)
    }
}

Output:

Stack(1, 3, 2, 7, 6, 5)
Elements divisible by 3: Stack(3, 6)