[Proposal] Add `Map.replace_key/3` and `Map.replace_key_in/3`

[hua qiu]

I've found myself repeatedly need to replace some key name in the map.

For example, to change the key name from "_id" to "id":

data = fetch_some_data_from_db()

{id, data} = Map.pop(data, "_id")

data |> Map.put(data, "id", id)

It gets messy when the target is deeply nested. 

To help deal with it, I wrote two util functions:

defp replace_key_in(data, [old_name], new_name),
  do: replace_key(data, old_name, new_name)

defp replace_key_in(data, [_ | _] = path, new_name) do
  {path, [old_name]} = Enum.split(path, -1)

  update_in(
    data,
    path,
    &replace_key(&1, old_name, new_name)
  )
end

defp replace_key(data, old_name, new_name) do
  {value, rest} = Map.pop(data, old_name)
  Map.put(rest, new_name, value)
end

Do you think we can add it to the Map module?

[Marcus Anthony Seth]

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Thanks.


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