Chapter 8 Modules
Modules are similar to classes. Both of them groups a collection of constants, variables, and so forth. Modules, however, do not have an instance and a subclass. Unlike classes, modules are defined using module ... end.
Modules provide two benefits:
- Namespace – Modules define a namespace in which your methods and constants will not clash with other methods and constants defined elsewhere.
- Mixin – Modules implement mixins. A mixin is a partially defined class. Through mixins, you can share the functionality between classes.