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Mishka developer tools provides some macros and modules to make creating your elixir application as easy as possible

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mishka_developer_tools lib helper extra.ex
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lib/helper/extra.ex 

defmodule Helper.Extra do

  @alphabet Enum.concat([?0..?9, ?A..?Z, ?a..?z])



  @spec randstring(integer) :: binary

  def randstring(count) do

    :rand.seed(:exsplus, :os.timestamp())



    Stream.repeatedly(&random_char_from_alphabet/0)

    |> Enum.take(count)

    |> List.to_string()

    |> String.upcase()

  end



  defp random_char_from_alphabet() do

    Enum.random(@alphabet)

  end

end