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Scala Mutable SortedMap exists()用法及代码示例


exists()方法用于检查给定谓词是否满足SortedMap的元素。

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

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

范例1:

// Scala program of exists() 
// method 
import scala.collection.SortedMap 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating SortedMap 
        val m1 = SortedMap("geeks" -> 5, "for" -> 3) 
          
        // Applying exists method 
        val result = m1.exists(x => x._1 == "for" && x._2 == 3) 
          
        // Displays output 
        println(result) 
      
    } 
}
输出:
true

因此,此处陈述的谓词对于第二个键值对为true,因此返回true。范例2:

// Scala program of exists() 
// method 
import scala.collection.SortedMap 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating SortedMap 
        val m1 = SortedMap("geeks" -> 5, "for" -> 3) 
          
        // Applying exists method 
        val result = m1.exists(x => x._1 == "geeks" && x._2 == 3) 
          
        // Displays output 
        println(result) 
      
    } 
}
输出:
false



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注:本文由纯净天空筛选整理自Shivam_k大神的英文原创作品 Scala Mutable SortedMap exists() 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。