带有示例的 Scala List exists() 方法

exists()方法用于检查给定谓词是否满足列表的元素。

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

Return Type: It returns true if the stated predicate holds true for some elements of the list else it returns false.

示例 #1：

// Scala program of exists()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
        // Creating a list
        val m1 = List(1, 2, 3, 4, 5)
          
        // Applying exists method
        val result = m1.exists(y => {y % 3 == 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 a list
        val m1 = List(1, 2, 3, 4, 5)
          
        // Applying exists method
        val result = m1.exists(y => {y % 9 == 0})
          
        // Displays output
        println(result)
      
    }
} 

输出：

false