I'm trying to invert a string in go but I'm having trouble handling the characters. Unlike C, GO treats strings as vectors of bytes, rather than characters, which are called runes here. I tried to do some type conversions to do the assignments, but so far I could not.
The idea here is to generate 5 strings with random characters of sizes 100, 200, 300, 400 and 500 and then invert their characters. I was able to make C work with ease, but in GO, the language returns an error saying that it is not possible to perform the assignment.
func inverte() {
var c = "A"
var strs, aux string
rand.Seed(time.Now().UnixNano())
// Gera 5 vetores de 100, 200, 300, 400, e 500 caracteres
for i := 1; i < 6; i++ {
strs = randomString(i * 100)
fmt.Print(strs)
for i2, j := 0, len(strs); i2 < j; i2, j = i+1, j-1 {
aux = strs[i2]
strs[i2] = strs[j]
strs[j] = aux
}
}
}
As you correctly identified, go strings are immutable, so you cannot assign to rune/character values at given indices.
Instead of reversing the string in-place one must create a copy of the runes in the string and reverse those instead, and then return the resulting string.
For example (Go Playground):
func reverse(s string) string {
rs := []rune(s)
for i, j := 0, len(rs)-1; i < j; i, j = i+1, j-1 {
rs[i], rs[j] = rs[j], rs[i]
}
return string(rs)
}
func main() {
fmt.Println(reverse("Hello, World!"))
// !dlroW ,olleH
fmt.Println(reverse("Hello, 世界!"))
// !界世 ,olleH
}
There are problems with this approach due to the intricacies of Unicode (e.g. combining diacritical marks) but this will get you started.