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Ruby is an Object Oriented Programming (OOP) language and custom classes and modules can be defined to improve how code is organized with the aim to make it easier to maintain and add new features.

This is a prototypical implementation of Extension Classes for Ruby. Extension Classes allow classes to define class extensions (i.e., method additions and method refinements) for other classes.

classes = VM.all_classes counts = VM.instance_counts(classes) classes.zip(counts) VirtualMachine.all_classes gives you a list (a java.util.List, but we make those behave mostly like a Ruby Array) of ...