Multi-application Umbrella Projects

It’s unfortunate that Erlang chose to call self-contained bundles of code applications. In many ways, they’re closer to being shared libraries. And as our projects grow, we may find ourselves wanting to split our code into multiple libraries, or applications.

Fortunately, mix makes this painless. To illustrate the process, we’ll create a simple Elixir evaluator. Given a set of input lines, it’ll return the result of evaluating each. This’ll be one ...