Scala Queue dropWhile() 方法与示例

dropWhile()方法用于从前面删除满足队列中给定谓词的最长前缀。

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.

示例 #1：

// 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)
    } 
} 

输出：

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

示例 #2：

// 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)
    } 
} 

输出：

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