Scala Map dropWhile()用法及代码示例

使用dropWhile()方法删除元素，直到满足指定条件为止。

函数定义: def dropWhile(p: ((A, B)) => Boolean): Map[A, B]

返回类型: It returns the longest suffix of elements of the stated map whose first element does not satisfies the predicate p.

范例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)

范例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()

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注：本文由纯净天空筛选整理自nidhi1352singh大神的英文原创作品 Scala Map dropWhile() method with example。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。