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.
