I'm sorry, I don't understand what you mean. Can you show an example of how you think the blog post should be changed? Thanks.

I think It's good to have

func AddOneToEachElement(slice []byte) {
    for i := range slice {
        slice[i]++
    }
}

in runnable snippet just like other functions in the blog.
for example:

func AddOneToEachElement(slice []byte) {
    for i := range slice {
        slice[i]++
    }
}
func main() {
    slice := buffer[10:20]
    for i := 0; i < len(slice); i++ {
        slice[i] = byte(i)
    }
    fmt.Println("before", slice)
    AddOneToEachElement(slice)
    fmt.Println("after", slice)
}

Hi afrouzMashaykhi , if u want to run example code with custom slice manipulater function just write your custom function with different name in code area then change 'AddOneToEachElement' function name to your new function name.(u can click the code are and write some code)

I hope it will help u,

yeah thanks @Quaqmre . But I think it will be good to have that option too, just like other functions in the blog. hom?

Maybe u right it will be much helpfull for developers,but this issue releated with https://github.com/golang/blog project , u can reopen this issue on blog project ı think.

And I checked source code of gddo and snippets can doable more flexible with small changes,
If u want to make changes and send pull request look at
https://github.com/golang/blog/blob/master/content/slices.article
line of 185

.code slices/prog010.go /^func/,/^}/
to
.code -edit slices/prog010.go /^func/,/^}/
...

@Quaqmre thanks for your help