Scala Map drop() 方法与示例

drop()方法用于删除前“n”个元素。

Method Definition: def drop(n: Int): Map[A, B]

Return Type: It returns all the elements of the map except the first ‘n’ elements.

示例 #1：

// Scala program of drop()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map("geeks" -> 5, "for" -> 3, "cs" -> 5)
          
        // Applying drop method
        val result = m1.drop(1)
          
        // Displays output
        println(result)
      
    }
}

输出：

Map(for -> 3, cs -> 5)

示例 #2：

// Scala program of drop()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map("geeks" -> 5, "for" -> 3, "geeks" -> 5)
          
        // Applying drop method
        val result = m1.drop(1)
          
        // Displays output
        println(result)
      
    }
}

输出：

Map(for -> 3)

因此，两个相同的键都从地图中删除。