Go Returning Multiple Values

package main

import "fmt"

func swap(x, y string) (string, string) {
   return y, x
}
func main() {
    
// call by reference
   a, b := swap("Ali", "Mohammad")
   fmt.Println(a, b)
 
 
// call by value
   var a2 = "Ali2"
   var b2 = "Mohammad2" 
   swap(a,b)
   fmt.Println(a2, b2)


// call by value   
   a3, b3 := "Ali3", "Mohammad3"
   swap(a,b)
   fmt.Println(a3,b3)

}