Introduction Design patterns offer solutions to common software design problems. When it comes to OOP (object-oriented programming), design patterns are more focused on solving the problems of object generation and interaction, rather than the larger scale problems of overall software architecture.[1] Gang of Four In 1994, four authors -- Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides (pictured below) -- also known as the Gang of Four (GoF) released the hugely popular - Design Patt

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