Elixir

Avoid macros
Don't separate multiple declarations of functions of the same name with newlines.
Indent pipes by two spaces when using the match operator (=).
Don't indent pipes when not using the match operator (=).
Prefer pattern matching and guards in function definitions over conditionals in the function body.
Break long lines after 100 characters.
Order the dependencies of a module as: use, import, alias.
Put an empty line between each type of dependency.
Sort the dependencies in each section alphabetically.