Scala Iterator dropWhile()用法及代码示例

dropWhile()方法属于类Abstract Iterator的具体值成员。它在类Iterator和IterableOnceOps中定义。它删除满足指定谓词的元素的最长前缀。

函数定义： def dropWhile(p:(A) => Boolean):Iterator[A]

Where, p is the predicate to be used.

返回类型： It returns the longest suffix of the stated iterator whose first element does not satisfies the used predicate.

范例1：

// Scala program of dropWhile() 
// method 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating an Iterator  
        val iter = Iterator(2, 3, 4, 6, 7) 
          
        // Applying dropWhile method 
        val x = iter.dropWhile(x => {x < 5}) 
          
        // Applying next method 
        val result = x.next() 
          
        // Displays output 
        println(result) 
    } 
}

输出：

范例2：

// Scala program of dropWhile() 
// method 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating an Iterator  
        val iter = Iterator(7, 3, 4, 6, 7) 
          
        // Applying dropWhile method 
        val x = iter.dropWhile(x => {x % 2 != 0}) 
          
        // Applying next method 
        val result = x.next() 
          
        // Displays output 
        println(result) 
      
    } 
}

输出：

相关用法

注：本文由纯净天空筛选整理自nidhi1352singh大神的英文原创作品 Scala Iterator dropWhile() method with example。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。