I like it. It would be to `Access.filter` what `Enum.find` is to
`Enum.filter`.
I think it would be a nice addition as it can express operations that would
be quite verbose otherwise.
Le mer. 20 mars 2024 à 02:30, 'oliver....@googlemail.com' via
elixir-lang-core <elixir-lang-core@googlegroups.com> a écrit :
> Hi.
>
> I already made a PR but was redirected here. ;-)
>
> This new function Access.find/1 would basically work like Enum.find/2 but
> for get_in/2 and similar functions.
>
> It can be used for scenarios like:
> - Popping the first found element.
> - Updating only the first found match in a list.
> - To get_in/2 an element directly instead of piping from get_in/2 into
> Enum.find/2.
>
> The implementation is very similar to Access.filter/1 and Access.at/1.
>
> We added this functions as utility function in our own project because we
> couldn't really find an elegant way to do such pointed updates with the
> existing functions.
>
> These are the examples I would have included in the doc string:
>
> iex> list = [%{name: "john", salary: 10}, %{name: "francine",
> salary: 30}]
> iex> get_in(list, [Access.find(&(&1.salary > 20)), :name])
> "francine"
>
> iex> get_and_update_in(list, [Access.find(&(&1.salary <= 40)),
> :name], fn prev ->
> ...> {prev, String.upcase(prev)}
> ...> end)
> {"john", [%{name: "JOHN", salary: 10}, %{name: "francine", salary:
> 30}]}
>
> iex> list = [%{name: "john", salary: 10}, %{name: "francine",
> salary: 30}]
> iex> pop_in(list, [Access.find(&(&1.salary <= 40))])
> {%{name: "john", salary: 10}, [%{name: "francine", salary: 30}]}
>
> iex> list = [%{name: "john", salary: 10}, %{name: "francine",
> salary: 30}]
> iex> get_in(list, [Access.find(&(&1.salary >= 50)), :name])
> nil
>
> iex> get_and_update_in(list, [Access.find(&(&1.salary >= 50)),
> :name], fn prev ->
> ...> {prev, String.upcase(prev)}
> ...> end)
> {nil, [%{name: "john", salary: 10}, %{name: "francine", salary: 30}]}
>
> Thanks,
> Oliver
>
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