he so-called Gang of Four (Gof), Erich Gamma, Richard Helm, Ralph Johnson, and Jon Vlissides, wrote the seminal work on patterns in 1995.
- Chapter 1. Object-Oriented Design
- from Practical Object-Oriented Design in Ruby: An Agile Primer
- Publisher: Addison-Wesley Professional
- Released: September 2012
gang of 4
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