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Ruby Programming
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Object-Oriented Design Libraries

One of the interesting things about Ruby is the way it blurs the distinction between design and implementation. Ideas that have to be expressed at the design level in other languages can be implemented directly in Ruby.

To help in this process, Ruby has support for some design-level strategies.

  • The Visitor pattern (Design Patterns, ) is a way of traversing a collection without having to know the internal organization of that collection.
  • Delegation is a way of composing classes more flexibly and dynamically than can be done using standard inheritance.
  • The Singleton pattern is a way of ensuring that only one instantiation of a particular class exists at a time.
  • The Observer pattern implements a protocol allowing one object to notify a set of interested objects when certain changes have occurred.

Normally, all four of these strategies require explicit code each time they're implemented. With Ruby, they can be abstracted into a library and reused freely and transparently.

Before we get into the proper library descriptions, let's get the simplest strategy out of the way.

Ruby Programming
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