...が可変パラメータを表すというサンプルコード

dot3_syntax.go

package main
 
import "fmt"
 
func main() {
    fmt.Println("\nExample I")
    testArgs([]int{1,2,3}...)
     
    fmt.Println("\nExample II")
    testArgs(1,2,3,4,5)
     
    fmt.Println("\nExample III")
    testArgs()
     
    fmt.Println("\nDynamic Array")
    intArray := [...] int {1,2,3,4,5,6,7}
    fmt.Println("Length: ",len(intArray))
    fmt.Println("Capacity: ",cap(intArray))
    fmt.Println(intArray)
     
    fmt.Println("\nInterface")
    interfaces := []interface{}{"A", "B", "C"}    
    fmt.Println(interfaces)
}

func testArgs(arg ...int) {
    fmt.Println("Length of Arguments: ",len(arg))
    fmt.Printf("Arguments: %+v\n",arg)
}