Re: The feature to find the value inside the nested map.

Agree.  Haskellers call them lenses.

There was a discussion about them here a few years ago:

http://erlang.org/pipermail/erlang-questions/2015-November/086879.html

And there have been a few implementation attempts:

   2020 https://github.com/slepher/lenses
   2015 https://www.cs.otago.ac.nz/staffpriv/ok/lens.erl
   2012 https://github.com/jlouis/erl-lenses

Best wishes

Ivan


On 16/06/2021 03:04, 瀬川昂弘 wrote:
> Assuming,
> Map = #{a => b,c => #{1 => 2,3 => 4,5 => #{x => y}}}.
>
> Expected:
> maps:new_find_fun(Key = 5, Map) = {ok,#{x => y}}.
>
> It's useful there is the above feature, in my guess.
>
> -- 
> Takahiro Segawa.
> E-mail：[email protected] 
> <mailto:[email protected]>

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