I strongly prefer rolling this all into enum. As you say, José, turtles all the way down!
This is a brainstorm for naming options, not a proposal. I'm not attached to any of these. Pairsort options: - order(..., ordering \\ :asc) - order_asc, order_desc - compare optionally, a variant on sort: sort_elements or, translate elements to other things that can be sorted, like this: rank(dates, ordering \\ :asc) That could take [date1, date2] and return rankings that can be sorted, like this: [2, 1] That could be as easy as converting to unix date. Do any of these ideas help? -bt On Sat, Oct 12, 2019 at 7:58 AM José Valim <jose.va...@plataformatec.com.br> wrote: > Apologies, I think my previous replies on the topic were > confusing/incomplete. > > I proposed Date.earliest/2 meaning that it would return a single date, but > of course, the sort variants are by far more useful. So we would need > Date.sort_earliest/2 or similar but I am bit conflicted because if it is > called sort, it should rather be in Enum as a general purpose function? > > Therefore, here are other ideas: > > 1. We can change Enum.sort/2 and friends so that, besides the sorting > function allowing true/false, it also accepts :gt/:eq/:lt. This means > sorting by earliest is as simple as: Enum.sort(dates, &Date.compare/2). But > we still need a way to do descending sort . > > 2. Add a new sorting function that when given two elements, must return > the first, instead of true/false today. This means that we could do > Enum.pairsort(dates, &Date.earliest/2) and Enum.pairsort(dates, > &Date.latest/2). "pairsort" is obviously a horrible name, suggestions are > welcome. > > Thoughts? > > *José Valim* > www.plataformatec.com.br > Skype: jv.ptec > Founder and Director of R&D > > > On Fri, Oct 11, 2019 at 9:33 AM Fernando Tapia Rico <fertap...@gmail.com> > wrote: > >> Right. >> >> I meant to return a single element, the "earliest" one. Otherwise I would >> find using a superlative for the function name confusing. >> >> The Decimal library could be another example. It provides a >> Decimal.compare/2 and a more semantic Decimal.min/2 and Decimal.max/2. >> >> On Friday, October 11, 2019 at 9:01:32 AM UTC+2, Tyson Buzza wrote: >>> >>> The earliest function as proposed by Jose above is more like the sort_by >>> function than the min function. It returns a sorted list. >>> >>> On Friday, October 11, 2019 at 2:40:47 PM UTC+8, Fernando Tapia Rico >>> wrote: >>>> >>>> I would drop the `mapper` function, and have a similar interface to >>>> `Enum.min/2`: `DateTime.earliest(list_of_dates, empty_fallback // fn -> >>>> raise(...) end)`. >>> >>> -- >> 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/bce11106-9f29-457e-b63f-e6eef0633d74%40googlegroups.com >> <https://groups.google.com/d/msgid/elixir-lang-core/bce11106-9f29-457e-b63f-e6eef0633d74%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/CAGnRm4KUZ2c54nfWi6oeU%3DbXfs2k_pbOz20Fv4%3DdMNfPUBmPcg%40mail.gmail.com > <https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4KUZ2c54nfWi6oeU%3DbXfs2k_pbOz20Fv4%3DdMNfPUBmPcg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- Regards, Bruce Tate CEO <https://bowtie.mailbutler.io/tracking/hit/f8218219-d2a8-4de4-9fef-1cdde6e723f6/c7c97460-016e-45fb-a4ab-0a70318c7b97> Groxio, LLC. 512.799.9366 br...@grox.io grox.io -- 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/CAFXvW-5tHY%3DPRq3vMe%3DBiuYEuPQDDdFBOCNjhc5i1WkHg-RhUA%40mail.gmail.com.
