Elixir's pipeline operator makes FP joyous. Here it is transforming an email address for Gravatar'ing

gravatar_url.ex

def gravatar_url(email, size) do
  hash = email
    |> String.strip
    |> String.downcase
    |> :erlang.md5
    |> Base.encode16(case: :lower)

  "https://secure.gravatar.com/avatar/#{hash}.jpg?s=#{size}&d=mm"
end