You're seeing just the function rename_keys, go back to Cldr.Map module for more information.
Link to this function

rename_keys(map, from, to, options \\ [])

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Rename map keys from from to to

  • map is any map/0

  • from is any value map key

  • to is any valid map key

  • options is a keyword list of options passed to deep_map/3


iex> Cldr.Map.rename_keys %{"a" => %{"this_one" => "value"}}, "this_one", "that_one"
%{"a" => %{"that_one" => "value"}}