Concepts & principles / design-pattern

Gang of Four design patterns

A catalog of recurring object-oriented design solutions described by Gamma, Helm, Johnson, and Vlissides.

Canonical graph nodegang-of-four-patterns

A vocabulary of tradeoffs

The original catalog groups patterns as creational, structural, and behavioral. A pattern names a recurring problem, context, and solution with consequences. It is not an instruction to introduce that solution everywhere.

Modern AI-assisted use

Ask an assistant to explain why a pattern fits a concrete change pressure and to compare a simpler alternative. Require behavioral tests before and after a refactor. For static publishing, an Adapter may clarify a platform boundary; a full Abstract Factory hierarchy is rarely justified merely to produce a few page layouts.

This graph describes selected patterns rather than claiming all 23 are implemented.

Original source

Design Patterns: Elements of Reusable Object-Oriented Software

Part of a connected world

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Outgoing connections

supportsSimplest-capable architecture

Connected from

Node data identity, meaning & relationships

The complete semantic record, rendered from root node: front matter.

semantic_node:
  description: A catalog of recurring object-oriented design solutions described by Gamma, Helm, Johnson, and Vlissides.
  id: gang-of-four-patterns
  kind: design-pattern
  name: Gang of Four design patterns
  relationships:
  - predicate: supports
    target: simplest-capable-architecture
  type: concept

Publishing metadata

description: A catalog of recurring object-oriented design solutions described by Gamma, Helm, Johnson, and Vlissides.
draft: false
title: Gang of Four design patterns
url: /graph/concepts/gang-of-four-patterns/