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Scala Stack dropWhile() method with example
  • Last Updated : 03 Nov, 2019

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)



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