beware that mail.([]interface{}) will *panic* if what is in there is not a
[]interface{}. You should almost always use ", ok" form of type casting,
i.e.
list, ok := mail.([]interface{})
if !ok {
// return an error or something sane
}
// use list
On Friday, August 12, 2016 at 2:41:26 PM UTC-4, Vasily Korytov wrote:
>
> Hi,
>
> I have an interface{} variable that can be either string or a list of
> string (yes, that's bad design, I know).
>
> I need a []string to feed it to strings.Join (I need one string for
> output).
>
> This way works, that is explicitly creating []string and copying each
> element to it:
>
> var list []string
> for _, v := range mail.([]interface{}) {
> list = append(list, v.(string))
> }
> rcpt = strings.Join(list, ", ")
>
> Have I overlooked something and there is a way to do it in a more graceful
> and effective way?
>
> Thanks.
>
> --
> Vasily Korytov
> https://chillum.github.io
>
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