Null object pattern: Difference between revisions

Revision as of 07:12, 14 November 2021

Revision as of 07:17, 14 November 2021

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{{Short description|Object with no referenced value or with defined neutral ("null") behavior}}

{{Redirect|Null object|the concept in category theory|Initial object}}

In [[object-oriented]] [[computer programming]], a '''null object''' is an [[Object (computer science)|object]] with no referenced value or with defined neutral ("''null"'') behavior. The null object [[design pattern]], which describes the uses of such objects and their behavior (or lack thereof). It, was first published in the [[Pattern Languages of Programs#Publications|''Pattern Languages of Program Design'' book series]].<ref>{{Cite book

| first = Bobby

| last = Woolf

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| year = 1998

| publisher = Addison-Wesley

}}</ref>{{Year needed|date=November 2021}}

==Motivation==