Hi !
I propose Map.replace/3.
Map.replace!/3 already exists.
However, it is difficult to use pattern match with Map.replace!/3 because
it raise error when key is not present in map.
So, I think it is a good idea make Map.replace/3 and it return
:error
when key is not present in map, and it return
{:ok, %{hoge: "hoge"}}
when key is present and work correctly.
Example:
iex> ex_map = %{a: 1, b: 2}
%{a: 1, b: 2}
iex>Map.replace(ex_map, :a, 3)
{:ok, %{a: 3, b: 2}}
iex>Map.replace(ex_map, :hoge, 3)
:error
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