Scala Stack dropWhile() method with example

In Scala Stack class, the dropWhile() method is utilized to drop the longest prefix from the top which satisfies a given predicate in a stack.

Method Definition: def dropWhile(p: (A) => Boolean): Stack[A]

Return Type: It returns a new stack that consists of elements after dropping the longest prefix satisfying the given predicate.

Example #1:

// Scala program of dropWhile()
// method

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

// Creating object
object GfG
{

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

        // Creating stack
        val s1 = Stack(6, 2, 3, 4, 5)

        // Print the stack
        println(s1)

        // Applying dropWhile method
        val result = s1.dropWhile(x => {x % 2 == 0})

        // Displays output
        print("Stack after using dropWhile() method: " + result)
    }
}

Output:

Stack(6, 2, 3, 4, 5)
Stack after using dropWhile() method: Stack(3, 4, 5)

Example #2:

// Scala program of dropWhile()
// method

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

// Creating object
object GfG
{

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

        // Creating stack
        val s1 = Stack(1, 7, 2, 3, 4, 5)

        // Print the stack
        println(s1)

        // Applying dropWhile method
        val result = s1.dropWhile(x => {x % 2 != 0})

        // Displays output
        print("Stack after using dropWhile() method: " + result)
    }
}

Output:

Stack(1, 7, 2, 3, 4, 5)
Stack after using dropWhile() method: Stack(2, 3, 4, 5)