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In his books, Alexander observes that in architecture throughout the world, there is a regularity with which design problems are solved by variations of a common set of design patterns. He articulates a language that uses building patterns as a grammar to enable architects and builders to discuss design problems and solutions. It is worthwhile to spend a little time familiarizing ourselves with Alexander s concept so that we can see how the pattern language works in its original setting. To appreciate a pattern language, we need to think and talk in the language.

Note While we call this form a function object, remember that all functions are objects. We simply use this term to differentiate between a function created via a literal and one created via an object constructor, which will be discussed in the next chapter.

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The factory pattern was originally documented by the GoF in their famous book Design Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley Professional, 1994). The factory pattern is a creational pattern, and every developer should be familiar with it regardless of whether the context is ORM or another approach. At the heart of the factory pattern is encapsulation. As I mentioned in the Aggregates section earlier in this chapter, it is always a best practice to limit creation of objects in your domain. The factory pattern provides a standard technique for controlling the creation of objects and aggregates in your domain model. By using this technique in your domain model, you can decouple the creation of objects, thereby increasing flexibility and reusability. In addition, by using encapsulation, you can enforce any constraints in your aggregates and reduce the risk of corruption. As you may have realized, if at all possible I like to think of all patterns and object-oriented design in terms of real-world, nontechnical examples. The factory pattern is an easy one to think about in this manner. Similar to a factory producing potato chips, an object-oriented factory assembles all the pieces to create a final product for your consumption. Additionally,

In The Timeless Way of Building, Alexander asserts that the design of a building or town needs to be alive and that this can be achieved by defining a sequence of patterns that gives life to the building or town. Alexander refers to this concept as a quality without a name. For example, a town can be given life by structuring it around a town center or marketplace from which narrow cobblestone lanes can be affixed and adorned with quaint shops. Such a design enables people to have a pleasant walk through atmospheric narrow lanes, passing one quaint shop after another to arrive at a marketplace abuzz with activity. In this vision, the town center or marketplace, narrow cobblestone lanes, and quaint shops are design patterns that have been carefully sequenced to create a town with a life, which is timeless and abuzz with pleasant activities. That timeless way of building is an obvious solution to the problem of an anti-shopping attitude, which bugs many consumers when shopping in enclosed shopping centers surrounded by acres of parking lots. From this brief introduction, we can see how easy it is for us to visualize the same problem domain as we both think and talk in the pattern language it s little wonder that Alexander s ideas have excited so many people!

Here s our add function using this form: var add = new Function('a', 'b', 'return a + b;'); console.log(typeof add); // 'function'

In computer science it is a little more difficult to become fluent and visualize problems and solutions, yet, as in learning any language, this short-term bump is soon smoothed over with persistence and practice.

with minor modifications to your factory, you can change the flavor of your potato chips to barbeque or nacho cheese, and the same holds true in the object world. With abstraction and interfaces, you can create a generic blueprint for your factory and change the aggregate object that is created. Figure 2-18 shows a diagram of the factory pattern.

console.log(add.name); console.log(add.length); console.log(add(20, 5));

I To appreciate pattern languages and design patterns, it is beneficial to read the original material. Tip

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