Please do send a PR. Although we should probably call it count_select? Also note that instead of Enum.flat_map you want to use Enum.sum. Make sure to test that scenario too. :)
On Thu, Nov 18, 2021 at 9:44 AM Rudolf Manusadzhian <rud.manusa...@gmail.com> wrote: > Registry provides Registry.select/2 > <https://hexdocs.pm/elixir/1.12/Registry.html#select/2> as an abstraction > on top of `:ets.select/2` to select key, pid, and values using match > specs. > > In one project we have a potential use case where we would like to only > "select_count". > > Registry.count_match/4 > <https://hexdocs.pm/elixir/1.12/Registry.html#count_match/4> doesn't work > for us, as it only matches on values under given key, while in our case we > want to match on values under any key. > > Surely we can first get the list and then count items in it, but that > won't be as nice as directly using :ets.select_count/2 > <https://www.erlang.org/doc/man/ets.html#select_count-2> > > Here > <https://github.com/RudolfMan/elixir/compare/main...RudolfMan:add-registry-select_count> > I put up together a version that does the same as `Registry.select/2` but > uses `:ets.select_count` underneath. > > However, since match spec for "select_count" always assumes the third > element to be `[true]` we could, probably only require the pattern and > optional guards. Similar to the specs of Registry.count_match/4 > <https://hexdocs.pm/elixir/1.12/Registry.html#count_match/4> > > Any thoughts? > > -- > You received this message because you are subscribed to the Google Groups > "elixir-lang-core" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to elixir-lang-core+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elixir-lang-core/512a59bc-d9b2-4e97-85a0-f61033e9424fn%40googlegroups.com > <https://groups.google.com/d/msgid/elixir-lang-core/512a59bc-d9b2-4e97-85a0-f61033e9424fn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. To unsubscribe from this group and stop receiving emails from it, send an email to elixir-lang-core+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4JpObFg4q-sKzQS%3DpAjYpDR0Uk-MYKdpV7r_Y_h%2Bx4asw%40mail.gmail.com.
