Scala Stack map() 方法与示例

在 Scala Stack class中， map()方法用于通过将函数应用于给定堆栈的所有元素来构建新堆栈。

Method Definition: def map[B](f: (A) => B): Stack[B]

Return Type: It returns a new stack containing all the elements after applying the given function.

示例 #1：

// Scala program of map() 
// method 
  
// Import Stack 
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating stack
        val s1 = Stack(5, 3, 2, 7, 6, 1) 
          
        // Print the stack 
        println(s1) 
           
        // Applying map method  
        val result = s1.map(x => x*x)
          
        // Display output 
        print("New stack after squaring all elements: " + result) 
         
    } 
} 

输出：

Stack(5, 3, 2, 7, 6, 1)
New stack after squaring all elements: Stack(25, 9, 4, 49, 36, 1)

示例 #2：

// Scala program of map() 
// method 
  
// Import Stack 
import scala.collection.mutable._
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
      
        // Creating stack
        val s1 = Stack(1, 3, 2, 7, 6, 5) 
          
        // Print the stack 
        println(s1) 
           
        // Applying map method  
        val result = s1.map(x => x/2)
          
        // Display output 
        print("New queue after dividing all elements by 2: " + result) 
         
    } 
} 

输出：

Stack(1, 3, 2, 7, 6, 5)
New queue after dividing all elements by 2: Stack(0, 1, 1, 3, 3, 2)