Scala Iterator exists() 方法与示例

exists()方法属于Abstract Iterator类的具体值成员。它在类IterableOnceOps中定义。它测试使用的谓词是否适用于所述集合的至少一个元素。它不会因无限大小的集合而终止。

Method Definition : def exists(p: (A) => Boolean): Boolean

Where, p is the predicate.

Return Type : It returns true if the given predicate p is satisfied by at least one element of the stated collection, else it returns false.

示例 #1：

// Scala program of exists()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(7, 3, 4, 11, 13)
          
        // Applying exists method
        val result = iter.exists(x => {x % 2 == 0})
          
        // Displays output
        println(result)
      
    }
}

输出：

true

示例 #2：

// Scala program of exists()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(7, 3, 5, 11, 13)
          
        // Applying exists method
        val result = iter.exists(x => {x % 2 == 0})
          
        // Displays output
        println(result)
          
    }
}

输出：

false