Design pattern categories
The fact that software development is an extremely broad topic leads to a number of things that can be done with programming. Everything is different and this leads to various requirements about the qualities of programs. All these facts have caused many different design patterns to be invented. This is further contributed to by the existence of various programming languages with different features and levels of expressiveness.
This book focuses on the design patterns from the point of view of Scala. As we mentioned previously, Scala is a hybrid language. This leads us to a few famous design patterns that are not needed anymore—one example is the null object design pattern, which can simply be replaced by Scala's Option ...
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