"Design Patterns" in Dynamic Languages
The Gang of Four book was actually 2 books: a nomenclature describing common software problems and a recipe book for solutions. The vocabulary they defined is still useful. The recipes are a disaster! Dynamic languages (like Groovy and Ruby) have powerful meta-programming facilities far beyond statically typed languages. It turns out that many of the structural design patterns in the Gang of Four book and beyond are much easier to solve with meta-programming. This session compares and contrasts the “traditional” approach of design patterns with a more nuanced meta-programming approach. Using language features creates cleaner abstractions with fewer lines of code and little or no additional structure. This session shows one of the many reasons that dynamic languages are such a hot topic.
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Neal Ford
ThoughtWorks
Neal Ford is Software Architect and Meme Wrangler at ThoughtWorks, a global IT consultancy with an exclusive focus on end-to-end software development and delivery. He is also the designer and developer of applications, instructional materials, magazine articles, courseware, video/DVD presentations, and author and/or editor of 6 books spanning a variety of technologies, including the most recent The Productive Programmer. He focuses on designing and building of large-scale enterprise applications. He is also an internationally acclaimed speaker, speaking at over 100 developer conferences worldwide, delivering more than 600 talks. Check out his web site at http://www.nealford.com. He welcomes feedback and can be reached at nford@thoughtworks.com.
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Comments
@Howard a PDF of the slides is linked above, and here.
Just a quibble. Your first example (Iterator) needs an update.
Java now has a native implementation of Iteratable that allows any collection or array (List, Set, Employee[]) to be iterated with a simple for (Employee: myEmployees) statement.So Groovy and Ruby have nothing obviously better than Java for iterating these containers.
Neal does such a great job showing killer features from both Groovy and Ruby.
Can you post your slides? Quite enjoyed the talk, and would love to point people to it.