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The null object pattern provides intelligent do nothing behavior, hiding the details from its collaborators null objects are intended to provide first-class citizens as a replacement for the primitive value none using them you can avoid conditional statements in your code a new feature for the application that i am working on has been requested by our applications users the feature is to allow the value of a set of dates entered
Null object design pattern the following is a description of the null object design pattern in the style set forth by gamma et al in their book design patterns null object design pattern sometimes i make the joke that design patterns are all about getting rid of if-else statements from your code the null object pattern is hi, today i'd like to write a little about specifying null objects and a simple booby trap pattern that can be used for this purpose a case for a null object?
Covers a simple design pattern implemented in c# there's a better quality version available at http://chocolatefordogscom/2008/02/04/null-object-pattern donвђ™t bother using null object pattern the first option is to just not bother using null object pattern, this is the easiest solution however has the dmitri nesterukвђ™s recent post chained null checks and the maybe monad struck a chord with me as i had messed about with something similar for performing a visitor
A special case of the specialcase pattern categorypattern: a null object can be useful in recursive structures, typical of compositepattern вђif you have a hammer, everything looks like a nailвђ™ my favorite pattern today is the null object pattern, so iвђ™m applying it everywhere but what this is where nullable types and the null object pattern come into play the following example shows how nullable types solve the problem of inconsistent state: