None of the conditions specified in that clause applies for updating key in-place. The way I read it, a new entry is not added, so the iteration should visit every entry only once. Thus, the program always prints "1 1".
On Tue, Aug 2, 2022 at 9:20 PM Kevin Chowski <ke...@chowski.com> wrote: > Hello Go gurus, > > I think there is some ambiguity in the language spec about what happens > when a map entry is updated during iteration. Quoting the spec ( > https://go.dev/ref/spec#For_range): > > 3. The iteration order over maps is not specified and is not guaranteed to > be the same from one iteration to the next. If a map entry that has not yet > been reached is removed during iteration, the corresponding iteration value > will not be produced. If a map entry is created during iteration, that > entry may be produced during the iteration or may be skipped. The choice > may vary for each entry created and from one iteration to the next. If the > map is nil, the number of iterations is 0. > > As per my read of the spec, there is no guarantee about what happens when > you update a map key in-place. > > For example, is this program guaranteed to print "1 1"? > https://go.dev/play/p/PeBEXKp1deH > > Apologies if I just missed some other part of the spec that ensures this. > > Thanks in advance for your time, > Kevin > > -- > 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/c4f1d37c-84bb-49c9-a935-7b1f560688e4n%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/c4f1d37c-84bb-49c9-a935-7b1f560688e4n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CAMV2RqqBL1rxQ9PQitVn3KnkWtoM6SYLCpVn8FPatU4-FiL21Q%40mail.gmail.com.
