Software design pattern: Difference between revisions

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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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==History==

Patterns originated as an [[Pattern (architecture)|architectural concept]] by [[Christopher Alexander]] as early as 1977 in [[A Pattern Language]] (c.fcf. his article, "The Pattern of Streets," JOURNAL OF THE AIP, September, 1966, Vol. 32, No. 5, pp.&nbsp;273–278). In 1987, [[Kent Beck]] and [[Ward Cunningham]] began experimenting with the idea of applying patterns to programming – specifically [[pattern language]]s – and presented their results at the [[OOPSLA]] conference that year.<ref name = "Smith1987">{{cite conference

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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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| [[LivinGrimoire]]

| modularly absorbs skills(features/abilities) with one line of code per skill

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| {{yes|{{cite web | url=https://github.com/yotamarker/LivinGrimoire/wiki | title=LivinGrimoire software pattern | website=GitHub}}}}

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[[List of software architecture styles and patterns|Software Architecture Style]] refers to a high-level structural organization that defines the overall system organization, specifying how components are organized, how they interact, and the constraints on those interactions.{{Citation needed|date=January 2025}} Architecture styles typically include a vocabulary of component and connector types, as well as semantic models for interpreting the system's properties. These styles represent the most coarse-grained level of system organization. Examples include [[Multitier architecture|Layered Architecture]], [[Microservices]], and [[Event-driven architecture|Event-Driven Architecture]]. <ref name="O'Reilly Media" /><ref name=":0" /><ref name=":1" />

See [[List of software anti-patterns]] for common patterns that are not useful and/or cause more issues than they solve.

==See also==

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*[[Design pattern]]

*[[Distributed design patterns]]

*[[Double-chance function]]

*[[Enterprise Architecture framework]]

*[[GRASP (object-oriented design)]]

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*[[Refactoring]]

*[[Software development methodology]]

*[[List of software anti-patterns]]

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