DevShed is wrapping up their look at the Strategy pattern with the last part of their series posted today - a look at validating a user's input via the pattern.

In the next few lines I'm going to demonstrate how to use the strategy pattern in a useful case, that is validating user-supplied input. Sound like an interesting experience, right?

They start by show how to build a "validation strategy selector" that uses a switch to hand off the request to the correct validation function. Naturally, this is followed by the creation of those validation classes and an example of their use. They wrap it all up with the complete code listing to make cut and paste coding easy.