I am trying to understand golang's syntax in doc but some things are hard to understand even they explain it.

For example:

func Reverse(s string) string {
   r := []rune(s)
   for i, j := 0, len(r)-1; i < len(r)/2; i, j = i 1, j-1 {
    r[i], r[j] = r[j], r[i]
   }
   return string(r)
}

I translated it to raw code:

func reverseString2(str string) string {
    var array = []rune(str)
    for i := 0; i < len(str)/2; i   {
        for j := len(str) - 1; ???? ; j-- {
          // ---
        }
    }
    return string(array)
}

my problem is that in the first one for i, j := 0, len(r)-1; i < len(r)/2; i, j = i 1, j-1, j does not seems to have a condition so in my code I dont know how to solve it.

CodePudding user response：

This is another method that is easier to read and leads to the same result. The only difference is that the scope of variable j has become different.

func Reverse(s string) string {
      r := []rune(s)
      j := len(r) - 1
      for i := 0; i < len(r)/2; i   {
          r[i], r[j] = r[j], r[i]
          j--
      }
      return string(r)
}