1. package main
    3. import (
    4.     "fmt"
    5. )
    7. func change(s ...string) {
    8.     fmt.Printf("#1 address of s[0] is %p and it's content is %s and it's len is %d \n", &s[0], s, len(s))
    9.     s[0] = "Go"
    10.     s = append(s, "playground")
    11.     fmt.Printf("#2 address of s[0] is %p and it's content is %s and it's len is %d \n", &s[0], s, len(s))
    12. }
    14. func main() {
    15.     enough := make([]string, 10, 10)
    16.     enough[0] = "The"
    17.     enough[1] = "First"
    18.     change(enough[0:2]...)
    19.     fmt.Printf("111111address of enough[0] id %p and it's content is %s and it's len is %d \n", &enough[0],
    20.         enough, len(enough))
    22.     notEnough := make([]string, 2, 2)
    23.     notEnough[0] = "The"
    24.     notEnough[1] = "Second"
    25.     change(notEnough[0:2]...)
    26.     fmt.Printf("2222222address of notEnough[0] id %p and it's content is %s and it's len is %d \n", &notEnough[0],
    27.         notEnough, len(notEnough))
    29.     /*
    30.         In the second case, the "append" function of change() creates a new array of double size and returns
    31.         the pointer to it. s now points to this new array. But in the main function nowEnough still points to the
    32.         old array of size 2.
    33.     */
    34. }