Names, Source Files, Conventions, Operators, and So On
Elixir identifiers consist of upper- and lowercase ASCII characters, digits, and underscores. They may end with a question or an exclamation mark.
Module, record, protocol, and behavior names start with an uppercase letter and are BumpyCase. All other identifiers start with a lowercase letter or an underscore, and by convention use underscores between words. If the first character is an underscore, Elixir doesn’t report a warning if the variable is unused in a pattern match or function parameter list.
Source files are written in UTF-8, but identifiers may use only ASCII.
By convention, source files use two-character indentation for nesting—and they use spaces, not tabs, to achieve this. ...
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