What is the difference between a class and a module?


Modules are collections of methods and constants. They cannot generate instances. Classes may generate instances (objects), and have per-instance state (instance variables).

Modules may be mixed in to classes and other modules. The mixed-in module’s constants and methods blend into that class’s own, augmenting the class’s functionality. Classes, however, cannot be mixed in to anything.

A class may inherit from another class, but not from a module.

A module may not inherit from anything.

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