I’ve been reading the Designing for Scalability with Erlang/OTP book and because of that I’ve been getting interested in writing some erlang code. I got curious if I could call my elixir code from erlang.

This is very simple. Since module and function names are just atoms in erlang you can call them like this:

'Elixir.IO':'puts'("Hello, world!").

Elixir puts all of it’s modules “under” the Elixir atom. So to call an Elixir function named Api.User.changeset() you would use 'Elixir.Api.User':'changeset'().