Function for swap casing

[Константин Трегубов]

I read how works functions upcase and downcase and try to think how to realize function swapcase.

in elixir/lib/elixir/unicode/unicode.ex  line308

  # Swapcase

  def swapcase(string), do: swapcase(string, "")

  for {codepoint, upper, lower, _title} <- codes do

    cond do

      lower && codepoint != lower ->

        defp swapcase(unquote(codepoint) <> rest, acc) do

          swapcase(rest, acc <> unquote(lower))

        end

      upper && codepoint != upper ->

        defp swapcase(unquote(codepoint) <> rest, acc) do

          swapcase(rest, acc <> unquote(upper))

        end

      true -> nil

    end

  end

  defp swapcase(<<char, rest::binary>>, acc) do

    swapcase(rest, <<acc::binary, char>>)

  end

  defp swapcase("", acc), do: acc

Result:

iex(17)> r(String.Casing)                                      

warning: redefining module String.Unicode (current version defined in memory)

  unicode.ex:1

warning: redefining module String.Casing (current version defined in memory)

  unicode.ex:294

warning: redefining module String.Break (current version defined in memory)

  unicode.ex:379

warning: redefining module String.Normalizer (current version defined in memory)

  unicode.ex:489

{:reloaded, String.Casing,

 [String.Unicode, String.Casing, String.Break, String.Normalizer]}

iex(18)> String.Casing.swapcase("ПриВЕ!!ббю..WEr5%oe902kj elk")

"пРИве!!ББЮ..weR5%OE902KJ ELK"

iex(19)> 

 If this code fine, can i do PR?))

In ruby this function names "swapcase". In elixir we may use different name like "reversecase", "togglecase".

[Ben Wilson]

Please don't post the exact same thing on both the elixir forum and this mailing list. Split discussions are very hard to follow.