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In [[software engineering]], a '''software design pattern''' or '''design pattern''' is a general, [[reusability|reusable]] solution to a commonly occurring problem in many contexts in [[software design]].<ref>{{cite book |last=Alexandrescu |first=Andrei |date=2001 |title=Modern C++ Design: Generic Programming and Design Patterns Applied |publisher=Addison-Wesley |page=xviii |isbn=978-0-201-70431-0}}</ref> A design pattern is not a rigid structure to be transplanted directly into [[source code]]. Rather, it is a description or a template for solving a particular type of problem that can be deployed in many different situations.<ref>{{cite book |last=Horner |first=Mark |date=2005 |title=Pro .NET 2.0 Code and Design Standards in C# |publisher=Apress |chapter=9 |page=171|isbn=978-1-59059-560-2 }}</ref> Design patterns can be viewed as formalized [[best practice]]s that the programmer may use to solve common problems when designing a software application or system.
[[Object-oriented programming|Object-oriented]] design patterns typically show relationships and interactions between [[class (computer science)|class]]es or [[object (computer science)|object]]s, without specifying the final application classes or objects that are involved.{{Citation needed|date=January 2025}} Patterns that imply mutable state may be unsuited for [[functional programming]] languages. Some patterns can be rendered unnecessary in languages that have built-in support for solving the problem they are trying to solve, and object-oriented patterns are not necessarily suitable for non-object-oriented languages.{{Citation needed|date=January 2025}}
Design patterns may be viewed as a structured approach to [[computer programming]] intermediate between the levels of a [[programming paradigm]] and a concrete [[algorithm]].{{Citation needed|date=January 2025}}
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== Object-oriented programming ==
[[Object-oriented programming|Object-oriented]] design patterns typically show relationships and interactions between [[class (computer science)|class]]es or [[object (computer science)|object]]s, without specifying the final application classes or objects that are involved. Patterns that imply mutable state may be unsuited for [[functional programming]] languages. Some patterns can be rendered unnecessary in languages that have built-in support for solving the problem they are trying to solve, and object-oriented patterns are not necessarily suitable for non-object-oriented languages.
==Examples==
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