Software Design Principles and Patterns

Software development is fundamentally a human-intensive discipline. This means that it requires knowledge of both techniques and technology, but also comprehension of the problem and the ability to make decisions to implement a solution on multiple levels of abstraction. Programming has much to do with how a developer thinks. Over the years, and within each context and language, guidelines and solutions have emerged to solve recurring problems. Knowledge of these patterns will help you identify when to apply them and speed your development on a sure footing. On the other hand, principles are guiding concepts that should be applied at every stage of the process and have more to do with how you approach the process.

In this chapter, we will take a look at a non-exclusive and non-exhaustive list of principles and patterns that are common in Vue 3 application development.

Principles	Patterns
Separation of concerns Composition over inheritance Single responsibility Encapsulation KIC – keep it clean DRY – don’t repeat yourself KISS – keep it simple stupid Code for the next	Singleton Dependency injection Observer Command Proxy Decorator Façade Callbacks Promises

Table 2.1 – The principles and patterns covered in this chapter

Understanding these principles and patterns will help you use the framework more efficiently and more often than not, it will prevent you from “reinventing the wheel”. Together with the first chapter, this will conclude the foundational part of this book and will give you the basis to follow the practical parts and implementation of application examples in the rest of the book.