Book Image

Mastering JavaScript Design Patterns - Second Edition

By : Simon Timms
Book Image

Mastering JavaScript Design Patterns - Second Edition

By: Simon Timms

Overview of this book

With the recent release of ES-2015, there are several new object-oriented features and functions introduced in JavaScript. These new features enhance the capabilities of JavaScript to utilize design patterns and software design methodologies to write powerful code. Through this book, you will explore how design patterns can help you improve and organize your JavaScript code. You’ll get to grips with creational, structural and behavioral patterns as you discover how to put them to work in different scenarios. Then, you'll get a deeper look at patterns used in functional programming, as well as model view patterns and patterns to build web applications. This updated edition will also delve into reactive design patterns and microservices as they are a growing phenomenon in the world of web development. You will also find patterns to improve the testability of your code using mock objects, mocking frameworks, and monkey patching. We’ll also show you some advanced patterns including dependency injection and live post processing. By the end of the book, you'll be saved of a lot of trial and error and developmental headaches, and you will be on the road to becoming a JavaScript expert.
Table of Contents (5 chapters)

Chapter 4. Structural Patterns

In the previous chapter, we looked at a number of ways to create objects in order to optimize for reuse. In this chapter, we'll take a look at structural patterns; these are patterns that are concerned with easing the design by describing simple ways in which objects can interact.

Again, we will limit ourselves to the patterns described in the GoF book. There are a number of other interesting structural patterns that have been identified since the publication of the GoF and we'll look at those in part 2 of the book.

The patterns we'll examine here are:

  • Adapter
  • Bridge
  • Composite
  • Decorator
  • Façade
  • Flyweight
  • Proxy

Once again, we'll discuss whether the patterns that were described years ago are still relevant for a different language and a different time.

Adapter

From time to time there is a need to fit a round peg in a square hole. If you've ever played with a child's shape sorting toy then you may have discovered that you can,...