Scala 设置 dropWhile() 方法与示例

dropWhile()方法用于从满足规定条件的集合中删除最长的元素前缀。

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

Return Type: It returns a set containing all the elements after dropping the longest prefix of elements from the set that satisfies the stated condition.

示例 #1：

// Scala program of dropWhile() 
// method 
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating a list 
        var s1 = Set(1, 3, 5, 4, 2) 
          
        // Print the set
        println(s1)
          
        // Applying dropWhile method 
        var res = s1.dropWhile(x => {x % 2 != 0}) 
          
        // Displays output 
        println(res) 
      
    } 
} 

输出：

Set(5, 1, 2, 3, 4)
Set(2, 3, 4)

示例 #2：

// Scala program of dropWhile() 
// method 
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating a list 
        var s1 = Set(1, 3, 5, 4, 2) 
          
        // Print the set
        println(s1)
          
        // Applying dropWhile method 
        var res = s1.dropWhile(x => true) 
          
        // Displays output 
        println(res) 
      
    } 
} 

输出：

Set(5, 1, 2, 3, 4)
Set()