Scala 不可变 TreeSet dropWhile() 方法

在 Scala 不可变TreeSet class中，使用dropWhile()方法从前面删除满足 TreeSet 中给定谓词的最长前缀。

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

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

示例 #1：

// Scala program of dropWhile() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet(2, 4, 6, 7, 8, 9) 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying dropWhile() method  
        val result = t1.dropWhile(x => {x % 2 == 0})
          
        // Displays output 
        println("TreeSet after using dropWhile() method: " + result)
          
    } 
} 

输出：

TreeSet(2, 4, 6, 7, 8, 9)
TreeSet after using dropWhile() method: TreeSet(7, 8, 9)

示例 #2：

// Scala program of dropWhile() 
// method 
  
// Import TreeSet
import scala.collection.immutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating TreeSet
        val t1 = TreeSet(3, 5, 6, 7, 8, 9) 
          
        // Print the TreeSet
        println(t1) 
          
        // Applying dropWhile() method  
        val result = t1.dropWhile(x => {x % 2 != 0})
          
        // Displays output 
        println("TreeSet after using dropWhile() method: " + result)
          
    } 
} 

输出：

TreeSet(3, 5, 6, 7, 8, 9)
TreeSet after using dropWhile() method: TreeSet(6, 7, 8, 9)