The “Gang of Four” software patterns

Cover of "Design Patterns: Elements of Re...
Cover via Amazon

Not about software development in the People’s Republic of China after the end of the Cultural Revolution: this “Gang of Four” are Erich Gamma, Richard Helm, Ralph Johnson and John M. Vlassides, the authors of what many (I have not read it) regard as a classic of computer books – Design patterns : elements of reusable object-oriented software.

Their book is partly a catalogue of design patterns and it is this aspect I am concerned with here.

They divided patterns into three types:

  • Creational: concerned with object instantiation
  • Structural: The composition and organisation of objects into larger structures
  • Behavioural: Algorithms, interactions and control flow between objects



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