Scala Iterator forall() 方法与示例

forall()方法属于 Class AbstractIterator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所有元素。对于无限大小的集合，它可能不会终止。

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

Return Type : It returns true if the stated collection is empty or if the given predicate p holds for all elements of this collection, else it returns false.

示例 #1：

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

输出：

true

示例 #2：

// Scala program of forall()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(3, 6, 15, 19, 21)
          
        // Applying forall method
        val result= iter.forall(x => {x % 3 == 0})
          
        // Displays output
        println(result)
      
    }
}

输出：

false