Right now I’m a bit drowning in work but IIRC there already was a proposal for
this, has anyone searched the mailing list?
On Wed, Mar 20, 2024, at 12:17 AM, Jean Klingler wrote:
> 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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