Go string ranging behavior

range.go

package main

import "fmt"

func main() {
	s := "样本"
	fmt.Println(len(s))

	fmt.Println("")
	fmt.Println("range index only:")
	for i := range s {
		fmt.Print(i, " ")
	}

	fmt.Println("")
	fmt.Println("range index/unused value:")
	for i, _ := range s {
		fmt.Print(i, " ")
	}

	fmt.Println("")
	fmt.Println("range index/value:")
	for i, v := range s {
		fmt.Print(i, "=", v, " ")
	}

	fmt.Println("")
	fmt.Println("byte cast - range index only:")
	for i := range []byte(s) {
		fmt.Print(i, " ")
	}

	fmt.Println("")
	fmt.Println("byte cast - range index/unused value:")
	for i, _ := range []byte(s) {
		fmt.Print(i, " ")
	}

	fmt.Println("")
	fmt.Println("byte cast - range index/value:")
	for i, v := range []byte(s) {
		fmt.Print(i, "=", v, " ")
	}

}