In this library are implemented functions (Char.lower?, Char.digit?, etc) to work with Unicode characters, which are is missing in the stdlib.

Add unicode_char to your list of dependencies in mix.exs:

def deps do
  [{:unicode_char, "~> 0.6"}]
end

• lower?
• upper?
• digit?
• control?
• whitespace?
• and so on.

defmodule MyModule do
  alias Unicode.Char # for convenience
  
  if Char.upper?("È") do
    # do something with upper case letter
  else
    # otherwise
  end
end

Steps to reproduce:

mix deps.get
mix bench --output ""