Thank you Michael. I honestly never looked at it from a human-language prospective! Maybe because 25+ years of interacting with programming languages made me a bit deaf to the sound of it, and my head is kind of translating it back and forth transparently. To think of it, it might explain why I find sometimes it is easier to express ideas in code than a just plain old English... *sigh*
Andrey On Saturday, June 29, 2019 at 5:05:44 PM UTC-6, Michael Jones wrote: > > My personal thought, though it may seem strange, is that the best argument > for it lies in the single word sentence at the bottom of your email. You > write "Thoughts?" -- and that is very expressive in English in just the way > that you mean above in your examples. I don't know enough other languages > to really know if the parallels are universal, but it's pretty clear to me > what it means why "file?.close()" and "os.Open(filename)?" are "punctuated" > as they are -- where the question is. I feel like you're asking this > compiler, "is there anything about this value that you need to tell me?" I > like that. > > The long (crazy long!) discussion of error handling has among its many > branches an analysis from the Go team about '?' and this kind of postfix > interrogation. I'm watching it all with a bit of wonder, but I wanted to > speak up and say how your human-language phrasing matches your idea of > computer-language phrasing. That seems a powerful kind of naturalness to > take advantage of in this issue and future ones. > > On Sat, Jun 29, 2019 at 2:56 PM Andrey Tcherepanov < > xnow4f...@sneakemail.com <javascript:>> wrote: > >> Hello mighty fighters of errors! >> >> Here comes my half-thought idea of another way to express error handling: >> >> *Add a postfix '?' that checks value for **emptiness (nil, 0, "") **AND >> an error for nil. * >> >> (Denis have shred it to pieces already in >> https://github.com/golang/go/issues/32852. Thank you Denis.) >> >> I am not good with expressing my inner talk, so there are couple examples >> >> original , Go 1 function >> >> func stat(filename string) (os.FileInfo, error) { >> >> var info os.FileInfo >> { >> var a1 *os.File >> if a1, err := os.Open(filename); err != nil || a1 == nil { >> return _, err >> } >> var a2 os.FileInfo >> if a2, err := a1.Stat(); err != nil || a2 == nil { >> return _, err >> } >> info = a2 >> } >> return info, nil >> } >> >> >> And with "?", trying to avoid original try() proposal handle leak >> >> // would return _, err, but since there is no err in signature, will return >> default value in case of error >> // uses ? on func call that returns (value, error) >> func stat2(filename string) (os.FileInfo) { >> file := os.Open(filename)? >> defer file.Close() >> return file.Stat()? >> } >> // would return error too, uses ? as "not nil" on a variable too >> func stat3(filename string) (_ os.FileInfo, err error) { >> var file *os.File >> defer file?.Close() >> file := os.Open(filename)? >> return file.Stat() >> } >> >> >> Thoughts? >> >> -- >> You received this message because you are subscribed to the Google Groups >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to golan...@googlegroups.com <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/golang-nuts/b7520ffe-ec38-4157-8f95-92844dcb0d0f%40googlegroups.com >> >> <https://groups.google.com/d/msgid/golang-nuts/b7520ffe-ec38-4157-8f95-92844dcb0d0f%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > > -- > > *Michael T. jonesmichae...@gmail.com <javascript:>* > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/12572785-f0aa-4f84-a0c4-1096364a1f94%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
