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Applying design patterns to JavaScript code creates more reliable and maintainable code. In this book, you will explore different design patterns and learn where and how to implement them with the help of detailed examples.In the first part of the book, we start off with an introduction to design patterns, and then move on to creating classes, interfaces, abstract classes, and methods. Next, we learn how to create classes that use design patterns to build fractal structures and tree structures. In the next chapter, we will explore polymorphism and create a class that inherits from another class. Then, you will learn how to use the builder pattern to create a class that builds a product. The next chapter covers the composite pattern, where we create a class that contains a product, but also contains other products and the potential for creating a new product. You will learn about the factory pattern where you create an object in a whole new way. Then, you will create a copy constructor to allow you to copy class objects. You will also learn about the decorator pattern, where you have a product object that provides additional functionality. In the next chapter, you will see how to design projects using object-oriented programming. You will learn how to create a set of classes that easily share data. However, you will pay a price to share this data, and we will discuss how to calculate this price. In the last chapter of this section, we will cover the singleton design pattern to create an object that is used just once. If you want to access that object, you will need to provide it with some form of security. The next chapter presents a collection of design patterns that have to do with managing state. We will show you how to create a class that manages state for a product. You will also learn how to synchronize state so two objects can be sharing state. This will allow you to build an application that manages state of objects. d2c66b5586