How Functional Programming will (Finally) do Away With the GoF Patterns

A recent article about various ways to implement structural pattern matching in Java has triggered my interest: http://blog.higher-order.com/blog/2009/08/21/structural-pattern-matching-in-java The article mentions a Scala example where a tree data structure can be traversed very easily and neatly using Scala's match keyword, along with using algebraic data types (more specifically, a sum type): def depth(t: Tree): Int … Continue reading How Functional Programming will (Finally) do Away With the GoF Patterns

The Visitor Pattern Re-visited

The visitor pattern is one of the most overrated and yet underestimated patterns in object-oriented design. Overrated, because it is often chosen too quickly (possibly by an architecture astronaut), and then bloats an otherwise very simple design, when added in the wrong way. Underestimated, because it can be very powerful, if you don't follow the … Continue reading The Visitor Pattern Re-visited