Monday, February 16, 2009

Design Patterns in Ruby

Previously I wrote a post about Design Patterns in Beanshell. Now I have converted them in ruby scripts. Some of DP implementations in Ruby does not make sense because of highly dynamic nature of this language.

Creational Patterns

Abstract Factory
Factory Method
Singleton (corrected)
Lazy Initialization

Structural Patterns


Behavioral Patterns

Chain of Responsibility
Domain Function
Observer with Observer library
Template Method
Template Method (corrected)

Enterprise Patterns

Data Access Object

My main sources:

1. Design Patterns in Beanshell
2. Design Patterns in Ruby : web site and the book


jadarkwah said...

Hi Alex,
We met in Marquand park last year.
Great posts. I read the DP in ruby book as well.

Anonymous said...

Hi Alex,

This is a great effort. I own the design patterns book and would love to see it updated. What you're doing here makes design patterns even more accessible to ruby developers. I hope we can further develop what you have as a community resource, with more background descriptions, and possibly even a guide for when to use or not use a particular pattern.

It's particularly important to know the Ruby versions of these patterns so that we're not implementing the generic patterns when Ruby offers an even shorter more intuitive alternative.

Something to note. Looking at your "lazy initialization" pattern, I think I'd call that "virtual proxy". Wikipedia does a nice job of describing four patterns that fall under an umbrella of closely related patterns:

Lazy Loading
- Lazy Initialization
- Virtual Proxy
- Ghost
- Value Holder

Joe Chesak

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