带有示例的 Scala Map dropWhile() 方法

dropWhile()方法用于删除元素，直到满足所述条件。

Method Definition: def dropWhile(p: ((A, B)) => Boolean): Map[A, B]

Return Type: It returns the longest suffix of elements of the stated map whose first element does not satisfies the predicate p.

示例 #1：

// Scala program of dropWhile()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map("geeks" -> 5, "for" -> 3, "cs" -> 2)
          
        // Applying dropWhile method
        val result = m1.dropWhile(z=>false) 
          
        // Displays output
        println(result)
      
    }
}

输出：

Map(geeks -> 5, for -> 3, cs -> 2)

示例 #2：

// Scala program of dropWhile()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map("geeks" -> 5, "for" -> 3, "cs" -> 2)
          
        // Applying dropWhile method
        val result = m1.dropWhile(z=>true) 
          
        // Displays output
        println(result)
          
    }
}

输出：

Map()