I’m confused… it is A that doesn’t work, and B works… everyone keeps stating that B doesn’t work and A works….
> On Oct 24, 2018, at 10:55 AM, jake6...@gmail.com wrote: > > That is correct. The relevant part of > https://golang.org/ref/spec#Passing_arguments_to_..._parameters > <https://golang.org/ref/spec#Passing_arguments_to_..._parameters> is where it > says: " respective parameter passing rules > <https://golang.org/ref/spec#Passing_arguments_to_..._parameters>apply". This > links to https://golang.org/ref/spec#Passing_arguments_to_..._parameters > <https://golang.org/ref/spec#Passing_arguments_to_..._parameters> which says: > > "Otherwise, the value passed is a new slice of type []T with a new underlying > array whose successive elements are the actual arguments, which all must be > assignable <https://golang.org/ref/spec#Assignability> to T." > > So in the OP's example https://play.golang.org/p/59bpr8TCIge > <https://play.golang.org/p/59bpr8TCIge>, the function A() is assigning a > []string to the variadic ...[]interface{}. Since string is assignable to > interface{}. this is fine. The function B() is assigning a []interface{} to > the variadic of ...[]string. Since interface{} is not assignable to string, > this is not allowed. > > Hope that clarifies. > > > On Wednesday, October 24, 2018 at 9:11:50 AM UTC-4, Robert Engels wrote: > But it is the varadic one that works according to OP. > > On Oct 24, 2018, at 4:19 AM, Jan Mercl <0xj...@ <>gmail.com > <http://gmail.com/>> wrote: > >> On Wed, Oct 24, 2018 at 7:34 AM Mayank Jha <mayank2...@ <>gmail.com >> <http://gmail.com/>> wrote: >> >> > why does A() not work while B works here, >> > https://play.golang.org/p/59bpr8TCIge >> > <https://play.golang.org/p/59bpr8TCIge> >> >> Type mismatch. The compiler is clear about it: >> >> prog.go:8:12: cannot use s (type []string) as type []interface {} in >> append >> >> From https://golang.org/ref/spec#Appending_and_copying_slices >> <https://golang.org/ref/spec#Appending_and_copying_slices> >> >> ---- >> The variadic function append appends zero or more values x to s of type S, >> which must be a slice type, >> and returns the resulting slice, also of type S. The values x are passed to >> a parameter of type ...T >> where T is the element typeof S and the respective parameter passing rules >> apply. As a special case, >> append also accepts a first argument assignable to type []byte with a second >> argument of string type >> followed by .... This form appends the bytes of the string. >> --- >> >> In the OP code, type T is `interface{}`, but the appended elements have type >> `string`. That violates the above quoted specs. >> >> >> -- >> -j >> >> >> -- >> 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...@ <>googlegroups.com <http://googlegroups.com/>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > 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 > <mailto:golang-nuts+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- 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. For more options, visit https://groups.google.com/d/optout.
