Scala Iterator filter() 方法与示例

filter()方法属于AbstractIterator类的具体值成员。它在Iterator和IterableOnceOps类中定义。它选择满足所用谓词的所述迭代器的所有元素。

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

Return Type : It returns a new iterator containing all the elements of the stated iterator which satisfies the given predicate.

示例 #1：

// Scala program of filter()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(7, 8, 5, 4, 13)
          
        // Applying filter method
        val x = iter.filter(x => {x % 2 == 0})
          
        // Applying next method
        val result = x.next()
          
        // Displays output
        println(result)
      
    }
}

输出：

8

示例 #2：

// Scala program of filter()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(3, 9, 5, 1, 13)
          
        // Applying filter method
        val x = iter.filter(x => {x % 3 != 0})
          
        // Applying next method
        val result = x.next()
          
        // Displays output
        println(result)
      
    }
}

输出：

5