I've written about the template method pattern before. For my money it's still a very useful pattern for building super lightweight frameworks and enabling the open-closed principle which states: Software entities (classes, modules, functions, etc.) should be open for extension, but closed for...

In Domain-Driven Design we turn to the specification pattern when we want to check whether an object matches some criteria. I think specification is the oft-forgotten bastard child pattern of the domain model pattern language. I know I frequently turn to queries -- sometimes query objects -- when I want...