You cannot mutate strings. Your code is also missing a final close-brace
and possibly has other problems. That your example includes commented out
code is also problematic. As Nikhilesh Susarla pointed out you should post
a link to the Go playground to avoid any ambiguity.
I added the missing close-brace to your code and observed the following
behavior (I entered "1" at the prompt):
> go run x.go
144.6 ms
State where the hash counter should begin:>> 1
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x28 pc=0x102536674]
This tells me there is a fundamental bug in your code having nothing to do
with "Problems with array slicing reliability"
On Wed, Nov 23, 2022 at 1:56 PM Mucas Schlack <lojik...@gmail.com> wrote:
> Hello Golangers!
> Is there anyone who can test the reliability of the following Golang slice
> feature? I am using an AMG64 computer with Windows 10, and Go version
> 0.36.0. When I use the following code, to detect and then replace a
> character at any given length *n* (9) in a string with an Uppercase
> Character. Strangely and somehow, the slice pointer will move to another
> position even though the code is not dynamic and has not changed. Is there
> anyone who can trouble shoot this code for me?
>
> Please remember that this is "*test*" code only, so some of it will not
> make any sense or work. It is only "proof of concept" code.
>
> The code to pay attention to is the following - from lines: 80 - 92!
>
> Many thanks for any help you can give!
>
> Mucas
>
> Example code:
>
> package main
>
> import(
> //"unicode/utf8"
> "math/rand"
> "strconv"
> "strings"
> "fmt"
> "time"
> "os"
> )
>
> var alphanumerics = [62] string {
>
> "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z",
> "0","1","2","3","4","5","6","7","8","9",
>
> "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",
> }
>
> func main(){
>
> var (
> txtflpth string = "C:\\Workspace\\Transaction Hash.txt"
> flNm string = "Transaction Hash.txt"
> CRLF string = "\n"
> cntstrt string
> AuthKey string
> NwStr string
> cstart int
> cntr int
> flEx *os.FileInfo
> flEx2 *os.File
> trfl *os.File
> err error
> )
>
> fmt.Print("State where the hash counter should begin:>> ")
> fmt.Scanln(&cntstrt)
>
> if cntstrt == "" || cntstrt == " " {
> trfl, err = os.Create(flNm)
>
> if err != nil { panic(err); os.Exit(-1) }
> defer trfl.Close()
>
> } else {
> var flEx, err = os.Stat(txtflpth)
>
> fmt.Println(flEx.Mode().String)
> //fmt.Println(flEx.IsRegular())
> fmt.Println(flEx.IsDir())
> fmt.Println(flEx.Name())
> fmt.Println(flEx.Size())
> fmt.Println(flEx.Sys())
>
> if err != nil { if os.IsNotExist(err) { panic(err) } }
>
> cstart, err = strconv.Atoi(cntstrt)
> flEx2, err := os.Open(txtflpth)
> defer flEx2.Close()
> }
>
> /*defer func(
> if err == trfl.Close() || err == os.IsNotExist(err)!= err {
> panic(err) }
> if err == flEx.Close() || err == os.IsNotExist(err)!= err {
> panic(err) }
> )*/
>
> if cntstrt != "" && cntstrt != " " { cntr = cstart }
>
> for cntr = cstart; cntr < cstart + 1000; cntr++ {
> NwStr = ""
> AuthKey = NwStr
>
> for i := 0; i <= 65; i++ {
> time.Sleep(10 * time.Nanosecond)
> rand.Seed(time.Now().UnixNano())
> AuthKey = AuthKey + alphanumerics[rand.Intn(62)] //, [A - Z],
> [0-9])
> }
>
> var hashRemap = [...] string {"A","U","G","D","E","X"}
>
> AuthKey = "0x" + AuthKey
> fmt.Println("Transaction Hash: " + strconv.Itoa(cntr) + ") " +
> AuthKey)
> //AuthKey2 := []rune(AuthKey)
>
> StrPos := strings.Index(AuthKey, AuthKey[9:10])
> fmt.Printf("The old character %s is at string position: (%d) " +
> CRLF,AuthKey[9:10], StrPos)
> //os.Exit(1)
>
> for i := 0; i < 6; i++ {
> switch i {
> case 0: AuthKey = strings.Replace(AuthKey,AuthKey[9:10],
> hashRemap[0], 1); fmt.Println("Replaced! The New Transaction Hash: " + "("
> + strconv.Itoa(i) + ") " + AuthKey); os.Exit(1);
> case 1: AuthKey = strings.Replace(AuthKey,"",
> hashRemap[1], 1)
> case 2: AuthKey = strings.Replace(AuthKey,"",
> hashRemap[3], 1)
> case 3: AuthKey = strings.Replace(AuthKey,"",
> hashRemap[4], 1)
> case 4: AuthKey = strings.Replace(AuthKey,"",
> hashRemap[5], 1)
> case 5: AuthKey = strings.Replace(AuthKey,"",
> hashRemap[5], 1)
> }
>
> }
>
> fmt.Println("Transaction Hash: " + strconv.Itoa(cntr) + ") " +
> AuthKey)
> if trfl != nil { trfl.WriteString("Transaction Hash: " +
> strconv.Itoa(cntr) + ") " + AuthKey + CRLF) }
> if flEx != nil { flEx2.WriteString("Transaction Hash: " +
> strconv.Itoa(cntr) + ") " + AuthKey + CRLF) }
>
> --
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> .
>
--
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank
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