design pattern

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      A design pattern is the re-usable form of a solution to a design problem. The idea was introduced by the architect Christopher Alexander and has been adapted for various other disciplines, particularly software engineering.


      Details



      An organized collection of design patterns that relate to a particular field is called a pattern language. This language gives a common terminology for discussing the situations designers are faced with.

      The elements of this language are entities called patterns. Each pattern describes a problem that occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice.
      Documenting a pattern requires explaining why a particular situation causes problems, and how the components of the pattern relate to each other to give the solution. Christopher Alexander describes common design problems as arising from "conflicting forces"—such as the conflict between wanting a room to be sunny and wanting it not to overheat on summer afternoons. A pattern would not tell the designer how many windows to put in the room; instead, it would propose a set of values to guide the designer toward a decision that is best for their particular application. Alexander, for example, suggests that enough windows should be included to direct light all around the room. He considers this a good solution because he believes it increases the enjoyment of the room by its occupants. Other authors might come to different conclusions, if they place higher value on heating costs, or material costs. These values, used by the pattern's author to determine which solution is "best", must also be documented within the pattern.
      Pattern documentation should also explain when it is applicable. Since two houses may be very different from one another, a design pattern for houses must be broad enough to apply to both of them, but not so vague that it doesn't help the designer make decisions. The range of situations in which a pattern can be used is called its context. Some examples might be "all houses", "all two-story houses", or "all places where people spend time".
      For instance, in Christopher Alexander's work, bus stops and waiting rooms in a surgery center are both within the context for the pattern "A PLACE TO WAIT".


      Examples


      Software design pattern, in software design
      Architectural pattern, for software architecture
      Interaction design pattern, used in interaction design / human–computer interaction
      Pedagogical patterns, in teaching
      Pattern gardening, in gardening
      Business models also have design patterns. See Business model § Examples.


      See also


      Style guide
      Design paradigm
      Anti-pattern
      Dark pattern


      References




      Further reading

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    Design Patterns - refactoring.guru

    Design Patterns are typical solutions to commonly occurring problems in software design. They are blueprints that you can customize to solve a particular design problem in your code.

    Software Design Patterns Tutorial - GeeksforGeeks

    Jan 2, 2025 · Software design patterns are reusable solutions to common software development challenges that help developers create more robust, maintainable, and scalable systems.

    Software design pattern - Wikipedia

    In software engineering, a software design pattern or design pattern is a general, reusable solution to a commonly occurring problem in many contexts in software design. [1] A design pattern is not a rigid structure to be transplanted directly into source code.

    The Catalog of Design Patterns - refactoring.guru

    The catalog of design patterns grouped by intent, complexity, and popularity. The catalog contains all classic design patterns and several architectural patterns.

    Java Design Patterns Tutorial - GeeksforGeeks

    Jan 3, 2025 · Java design patterns provide structured, reusable solutions to common software design problems, enhancing code maintainability, flexibility, and team communication.

    Design pattern - Wikipedia

    A design pattern is the re-usable form of a solution to a design problem. The idea was introduced by the architect Christopher Alexander [1] and has been adapted for various other disciplines, particularly software engineering. [2]

    Complete Guide to Design Patterns - GeeksforGeeks

    Feb 19, 2024 · Design patterns help in addressing the recurring issues in software design and provide a shared vocabulary for developers to communicate and collaborate effectively. They have been documented and refined over time by experienced developers and software architects.

    Refactoring and Design Patterns

    Design Patterns are typical solutions to commonly occurring problems in software design. They are blueprints that can be taken and customized to solve a particular design problem in your code. More about Design Patterns »

    Design Patterns in Java Tutorial - Online Tutorials Library

    Design Patterns in Java Tutorial - Design patterns represent the best practices used by experienced object-oriented software developers. Design patterns are solutions to general problems that software developers faced during software development.

    Design Pattern - Overview - Online Tutorials Library

    Design patterns represent the best practices used by experienced object-oriented software developers. Design patterns are solutions to general problems that software developers faced during software development.