带有示例的 Scala 迭代器 dropWhile() 方法

dropWhile()方法属于Abstract Iterator类的具体值成员。它在Iterator和IterableOnceOps类中定义。它丢弃满足所述谓词的最长元素前缀。

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

Where, p is the predicate to be used.

Return Type : It returns the longest suffix of the stated iterator whose first element does not satisfies the used predicate.

示例 #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：

6

示例 #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：

4