title: Does elixir Enum or any other module have group_by function similar to ruby's group_by
body: <p>Ruby has this awesome method <a href="http://apidock.com/ruby/Enumerable/group_by" rel="nofollow">group_by</a> for Enumerable. Does Elixir have something similar? I could not find this functionality on the Enum module. Thanks </p>