交换两个字符串（Golang）

Question

I am currently learning Golang, and i decided to write few simple algorithm for learning the syntax. i hope it's not already answers but i didn't found it ..

I have a problem for swapping string

func swap(str1, str2 string) {
    /*
     * Also possible :
     * str1, str2 = str2, str1
     */
    // str1, str2 = str2, str1
    tmp := str1
    str1 = str2
    str2 = tmp
}

func main() {
    a := "World !"
    b := "Hello"
    swap(a, b)
    fmt.Printf("a=%s
b=%s
", a, b)
}

Why this code didn't work ?

Answer 1

Swapping str1 and str2 doesn't change a and b, because they are copies of a and b. Use pointers:

func swap(str1, str2 *string) {
    *str1, *str2 = *str2, *str1
}

func main() {
    a := "salut"
    b := "les gens"
    swap(&a, &b)
    fmt.Printf("a=%s
b=%s
", a, b)
}

http://play.golang.org/p/Qw0t5I-XGT