Scala Map find() 方法与示例

find()方法用于查找满足给定谓词的映射的第一个元素。

Method Definition: def find(p: ((A, B)) => Boolean): Option[(A, B)]

Return Type: It returns the first element of the map which satisfies the given predicate.

示例 #1：

// Scala program of find()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating map
        val m1 = Map(3 -> "geeks", 1 -> "for", 2 -> "cs")
          
        // Applying find method
        val result = m1.find(_._2 == "for")
          
        // Displays output
        println(result)
      
    }
}

输出：

Some((1, for))

因此，这里第二对是满足给定谓词的第一对，因此返回第二对。
示例 #2：

// Scala program of find()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating map
        val m1 = Map(3 -> "geeks", 1 -> "for", 2 -> "cs", 6 -> "geeks")
          
        // Applying find method
        val result = m1.find(_._2 == "geeks")
          
        // Displays output
        println(result)
      
    }
}

输出：

Some((3, geeks))