Functions exactly like Map.get_and_update/3, but also takes a default value to use if the value at key is nil.

The function argument fun will be run on the default argument.

Rename the keys of map according to the rules given by names.

Examples

iex> Effusion.Map.rename_keys(%{a: 1, b: 2}, %{a: :x, b: :y})
%{x: 1, y: 2}