Gang of Four (GOF) are the 4 superheroes who invented the concept of design patterns. These heroes are Erich Gamma, Ralph Johnson, Richard Hel and John Vlissides. These people documented the design patterns in a book called “Design Patterns: Elements of Reusable Object-Oriented Software” in 1995. If not for these people, the software developers would have wasted time-solving problems of recurring nature instead of focussing on business requirements.
