Oops. Please ignore my entire post. Misunderstood completely. On Wednesday, October 24, 2018 at 11:55:18 AM UTC-4, Jake Montgomery wrote: > > That is correct. The relevant part of > 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 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, 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> wrote: >> >> On Wed, Oct 24, 2018 at 7:34 AM Mayank Jha <mayank2...@gmail.com> wrote: >> >> > why does A() not work while B works here, >> 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 >> >> ---- >> 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. >> For more options, visit https://groups.google.com/d/optout. >> >>
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