Try & Catch sounds great!
在2022年5月19日星期四 UTC+8 00:15:09<har...@gmail.com> 写道：
> Hi all,
>
> I thought now was the time to go public. The automatic error propagation
> is possible with the help of a simple Go package, and it has been about
> three years now:
>
> func CopyFile(src, dst string) (err error) {
> defer err2.Returnf(&err, "copy %s %s", src, dst)
>
> r := try.To1(os.Open(src))
> defer r.Close()
>
> w := try.To1(os.Create(dst))
> defer err2.Handle(&err, func() {
> _ = os.Remove(dst)
> })
> defer w.Close()
>
> try.To1(io.Copy(w, r))
> return nil
> }
>
> The playground <https://go.dev/play/p/bUGX8yDAeoL>.
>
> A couple of blog posts about the subject:
>
> - Error Propagation
>
> <https://hackernoon.com/golang-more-error-handling-with-less-checking-eeh31go>
> - Errors as Discriminated Unions
> <https://hackernoon.com/billion-dollar-mistake-in-go-ll1s3tkc>
>
> I'm the author of those posts and the err2 package
> <https://github.com/lainio/err2>. Additional sources for original ideas
> are mentioned in the blogs and the package documentation. And, of course,
> pure error values are needed when transporting errors through channels.
>
> I hope that any gopher who tries the err2 package finds it as valuable and
> productive
> as we have. Indeed, Go is one of the most pragmatic and refactor-friendly
> native languages.
>
> Best regards,
> -Harri
>
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