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Scala Queue dropWhile() method with example
  • Last Updated : 18 Oct, 2019

The dropWhile() method is utilized to drop the longest prefix from the front which satisfies a given predicate in a queue.

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

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

Example #1:

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// Scala program of dropWhile() 
// method 
  
// Import Queue 
import scala.collection.mutable._
  
// Creating object 
object GfG 
  
    // Main method 
    def main(args:Array[String]) 
    
      
        // Creating queues 
        val q1 = Queue(2, 4, 6, 1, 8, 3, 5
          
        // Print the queue
        println(q1)
          
        // Applying dropWhile method 
        val result = q1.dropWhile(x => {x % 2 == 0}) 
          
        // Displays output 
        print("Queue after using dropWhile() method: " + result)
    

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Output:

Queue(2, 4, 6, 1, 8, 3, 5)
Queue after using dropWhile() method: Queue(1, 8, 3, 5)

Example #2:

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// Scala program of dropWhile() 
// method 
  
// Import Queue 
import scala.collection.mutable._
  
// Creating object 
object GfG 
  
    // Main method 
    def main(args:Array[String]) 
    
      
        // Creating queues 
        val q1 = Queue(1, 3, 2, 7, 6, 5
          
        // Print the queue
        println(q1)
          
        // Applying dropWhile method 
        val result = q1.dropWhile(x => {x % 2 != 0}) 
          
        // Displays output 
        print("Queue after using dropWhile() method: " + result)
    

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Output:

Queue(1, 3, 2, 7, 6, 5)
Queue after using dropWhile() method: Queue(2, 7, 6, 5)



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