技術標籤：scala系列scala

transform()方法用於將SortedMap的元素轉換為可變的SortedMap

函式定義:def transform(f: (K, V) => V): SortedMap.this.type

返回型別:It transforms all the elements of the SortedMap and returns them into a mutable SortedMap.

範例1：

// Scala program of transform() 
// method 
import scala.collection.immutable.SortedMap 

// Creating object 
object baoneng 
{ 

// Main method 
def main(args:Array[String]) 
{ 

// Creating a SortedMap 
val m1 = SortedMap(3 -> "bn", 4 -> "bmw", 2 -> "benz") 

// Applying transform method 
val result = m1.transform((key, value) => value.toUpperCase) 

// Displays output 
println(result) 

} 
}
 

輸出：

Map(2 -> BENZ, 3 -> BN, 4 -> BMW)

範例2：

// Scala program of transform() 
// method 
import scala.collection.immutable.SortedMap 

// Creating object 
object baoneng 
{ 

// Main method 
def main(args:Array[String]) 
{ 

 val m1 = SortedMap(3 -> "bn", 4 -> "bmw", 4 -> "benz") 
        val result = m1.transform((key, value) => value.toUpperCase)
        println(result)

} 
}
 

輸出：

Map(3 -> BN, 4 -> BENZ)