Thanks for your replies,
yes, it could be an String.contains? analog:
[1,2,"3",4] |> Enum.join |> String.contains?("34")
[1,:a,"3",4] |> Enum.join |> String.contains?("a3")
About the recursive version, it seems to have best performance:
[image: image.png]
[image: image.png]
El vie, 15 jul 2022 a las 9:38, Aleksei Matiushkin (<
aleksei.matiush...@kantox.com>) escribió:
> I have not benchmarked it, but I believe the recursive approach would be
> better
>
> ```
> defmodule MyList do
> def contains?(list, sublist, strict? \\ false)
>
> def contains?(_, [], _), do: true
> def contains?([], _, _), do: false
> def contains?([h | t], [hh | _] = sub, strict?) when h != hh, do: not
> strict? and contains?(t, sub, strict?)
> def contains?([h | t], [h | tt], strict?), do: contains?(t, tt, true) or
> contains?(t, [h | tt], strict?)
> end
> ```
>
> On Fri, Jul 15, 2022 at 2:07 PM 'eksperimental' via elixir-lang-core <
> elixir-lang-core@googlegroups.com> wrote:
>
>> 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 <
>> https://urldefense.proofpoint.com/v2/url?u=http-3A__julian.somoza-40gmail.com&d=DwICaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=rZfYwgMRyMdd1mpKac91VLHbd0qUJlcEVeNzbceWXvE&s=T8KKoaIf0UYlrJ_VQC1Qv_48Tje2jygIaQysVTXu2c0&e=>
>> 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://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_elixir-2Dlang_elixir_pull_11987_commits_2b7eba5f6419f906f565e7d4bfe3d687f3b8b052&d=DwICaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=rZfYwgMRyMdd1mpKac91VLHbd0qUJlcEVeNzbceWXvE&s=rqpOP9kyNDkOSBV-I2zlHssI6EVLQQ-iBW1F0k3nqFg&e=
>> >
>> > 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.
>> >
>> >
>>
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>> https://urldefense.proofpoint.com/v2/url?u=https-3A__groups.google.com_d_msgid_elixir-2Dlang-2Dcore_62d1588e.1c69fb81.3332c.1d2dSMTPIN-5FADDED-5FMISSING-2540gmr-2Dmx.google.com&d=DwICaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=rZfYwgMRyMdd1mpKac91VLHbd0qUJlcEVeNzbceWXvE&s=Ckh5t8xdml-Vx3UgfKMNxh3CoSb8IBfBORyYgVxcXsg&e=
>> .
>>
>
>
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