7.4. Conclusion

In this chapter, we drew together the concepts and techniques from the prior chapters, synthesizing analyses of the most common design patterns you will encounter in your practice. The discussions combined the EDPs and intermediate patterns in meaningful ways to reveal the underlying concepts and structure of high-level concepts of program design. Furthermore, you learned how to illustrate these patterns with PIN in a number of variations depending on what level of detail or context you wish to express. You saw how clues and cues in design pattern specifications can point you to leveraging your existing knowledge of other patterns to help you form a better picture of what a new pattern does. You also gained an understanding of how design patterns, even at this higher level, can be used with and inside each other, such as the instance of Template Method buried inside Factory Method.