带有示例的 Scala 迭代器 find() 方法

find()方法属于AbstractIterator类的具体值成员。它在类IterableOnceOps中定义。它找到满足给定谓词的所述集合的第一个元素。对于无限大小的集合，它不会终止。

Method Definition : def find(p: (A) => Boolean): Option[A]

Return Type :It returns an Option value containing the first element of the stated collection that satisfies the used predicate else returns None if none exists.

示例 #1：

// Scala program of find()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(2, 4, 5, 1, 13)
          
        // Applying find method
        val result= iter.find(x => {x % 2 == 0})
          
        // Displays output
        println(result)
  
    }
}

输出：

Some(2)

示例 #2：

// Scala program of find()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(3, 6, 15, 12, 21)
          
        // Applying find method
        val result= iter.find(x => {x % 3 != 0})
          
        // Displays output
        println(result)
      
    }
}

输出：

None