Hi Julian. It think it is a good addition. It is also analog to String.contains?/2
On Fri, 15 Jul 2022 04:58:59 -0700 (PDT) Julian Somoza <julian.som...@gmail.com> wrote: > Hi everyone, I was working on a suggestion to add a new function on > the List module in order to find out if a given sublist is inside > another list. > > We currently have *List.starts_with?/2* but this only match the > beginning: > > iex(1)> List.starts_with?([1, 2, 3], [1, 2]) > true > > Besides, we have *MapSet.subset*, but it ignores the elements order: > > iex(1)> MapSet.subset?(MapSet.new([1, 2]), MapSet.new([1, 2, 3])) > true > > iex(1)> MapSet.subset?(MapSet.new([2, 1]), MapSet.new([1, 2, 3])) > true > > I suggest a new function that works like *List.starts_with?/2* but > matches the entire list, either at the beginning, middle, or end of > the list. > > iex(1)> List.includes_sublist?([1,2,3,4,5], [2,3]) > true > > iex(1)> List.includes_sublist?([1,2,3,4,5], [1,2]) > true > > iex(1)> List.includes_sublist?([1,2,3,4,5], [3,4,5]) > true > > iex(1)> List2.includes_sublist?([1,2,3,4,5], [1,5]) > false > > I'm sharing with you also the function code: > > https://github.com/elixir-lang/elixir/pull/11987/commits/2b7eba5f6419f906f565e7d4bfe3d687f3b8b052 > > I aim to complement the List.starts_with?/2. This function could be > the same or even more useful because it finds the ordered sublist > also in the middle or in the end. > > Looking forward for your comments, > BR, > Julian Somoza. > > -- 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/62d1588e.1c69fb81.3332c.1d2dSMTPIN_ADDED_MISSING%40gmr-mx.google.com.
