Reviewing the GoF

The GoF originated from the unforgettable book, Design Patterns: Elements of Reusable Object-Oriented Software, published in 1994 and written by four authors— hence the name. This book popularized the notion of design patterns and proposed 23 of them. Many other patterns have been added since then. A good source to check most of the available patterns is this Wikipedia page: https://en.wikipedia.org/wiki/Software_design_pattern. Here, you can find the original patterns proposed by the GoF as well as more recently added ones. The first thing to know as a software architect is the different categories of design patterns, outlined as follows:

• Creational: Patterns in this category relate to the instantiation of objects. They mostly impact performance and scalability. They help prevent the waste of computing resources. Creational patterns, especially the dependency injection (DI) pattern, also improve the testability and maintainability of your code.
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