如何在GO中操纵字符串以反转它们? [英] How to manipulate strings in GO to reverse them?

问题描述

我正在尝试反转一个字符串，但是在处理字符时遇到了麻烦.与C不同，GO将字符串视为字节的向量，而不是字符，在这里称为符文.我尝试进行一些类型转换来完成分配，但到目前为止我还做不到.

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.

这里的想法是生成5个具有100、200、300、400和500大小的随机字符的字符串，然后反转它们的字符.我可以轻松地使用C，但是在GO语言中，该语言返回了一个错误，指出无法执行分配.

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
       }
   }
}

推荐答案

正确识别后，转到字符串是不可变的，因此您无法在给定的索引处分配符文/字符值.

As you correctly identified, go strings are immutable, so you cannot assign to rune/character values at given indices.

与其代替就地反转字符串，还必须在字符串中创建一个符文副本，然后反转它们，然后返回结果字符串.

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.

例如(进入操场):

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
}

由于Unicode的复杂性，这种方法存在一些问题(例如组合变音符号)，但这会让您入门.

There are problems with this approach due to the intricacies of Unicode (e.g. combining diacritical marks) but this will get you started.

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