Rafael rambling : Weblog

« Previous day (Nov 7, 2007) | Main | Next day (Nov 8, 2007) »

Thursday November 08, 2007

links for 2007-11-09

Really simple anamorphisms in Ruby

The categorical dual of catamorphisms. Huh? Know fold (or reduce, or inject) from functional programming languages? It takes a collection of things and successively transforms those into one result. Unfold does the exact opposite.

(tags: blog post FP functional programming CategoryTheory category Raganwald RegBraithwaite ReginaldBraithwaite ruby closure HOF anamorphism catamorphisms morphism function unfold)
Active Record vs Objects

Robert Martin criticizes the application of Rails Active Record to the model, as it implies too tight a coupling with the underlying database.

(tags: blog post Ruby rails RoR robertmartin RobertCMartin ActiveRecord pattern ORM mapping OO persistence RowDataGateway)
Elegant Byte Counting - Beautiful Code

Michael Feathers discussing an elegant example of the Special Case pattern [Folwer, PoEAA]

(tags: blog post pattern MichaelFeathers OO design SpecialCase NullObject example casestudy tip DesignPattern PoEAA)

Posted by rafaeldff [Sun] ( November 08, 2007 10:37 PM ) Permalink | Comments[0]