Scala Set foreach() 方法与示例

foreach()方法用于将给定函数应用于集合的所有元素。

Method Definition: def foreach(f: (A) => Unit): Unit

Return Type: It returns all the elements of the set after applying the given function to each of them.

示例 #1：

// Scala program of foreach() 
// method 
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
        // Creating a set 
        val s1 = Set(3, 7, 12, 9, 21) 
          
        // Applying foreach method 
        s1.foreach(x => println(x)) 
      
    } 
} 

输出：

21
9
12
7
3

示例 #2：

// Scala program of foreach() 
// method 
  
// Creating object 
object GfG 
{ 
  
    // Main method 
    def main(args:Array[String]) 
    { 
        // Creating a set 
        val s1 = Set(1, 2, 3, 4, 5) 
          
        // Applying foreach method 
        s1.foreach(x => println(x + " times " + x + " = " + x*x)) 
      
    } 
} 

输出：

5 times 5 = 25
1 times 1 = 1
2 times 2 = 4
3 times 3 = 9
4 times 4 = 16