On Thu, Feb 27, 2020 at 1:52 PM roger peppe <rogpe...@gmail.com> wrote:
> If you really just want to reverse rune-by-rune, it's pretty
> straightforward:
>
> func Reverse(s string) string {
> r := make([]byte, 0, len(s))
> for len(s) > 0 {
> _, n := utf8.DecodeLastRuneInString(s)
> i := len(s) - n
> r = append(r, s[i:]...)
> s = s[:i]
> }
> return string(r)
> }
>
> That will also deal correctly with invalid utf8 encoding - all the bytes
> of the original string will be present in the result.
>
Another option with slightly less bookkeeping (but slightly more magic
indices):
https://play.golang.org/p/sfMLimbcHSj
func reverse(str string) string {
if len(str) == 0 {
return ""
}
out := make([]byte, len(str))
lastoffset := len(str)
for offset, r := range str {
rl := utf8.RuneLen(r)
copy(out[lastoffset-rl:lastoffset], str[offset:offset+rl])
lastoffset -= rl
}
return string(out)
}
>
>
> On Wed, 26 Feb 2020 at 14:20, <ffm2...@web.de> wrote:
>
>> Maybe the implementation in Java is something you could steal to save
>> time. Have a look into class StringBuilder where there is a reverse()
>> method. It does the reversion differently depending on whether dealing with
>> UTF16 or not.
>>
>> Am Samstag, 15. Februar 2020 17:37:15 UTC+1 schrieb Amarjeet Anand:
>>>
>>> Hi
>>>
>>> I was wondering why isn't there built-in string reverse function. Is it
>>> left intentionally because of some reason?
>>>
>>> Although strings are immutable in go, there are multiple ways to achieve
>>> this pretty easily. But having this function inbuilt will save our time
>>> because we need it quite often.
>>>
>>>
>>> --
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