The world of software is riddled with principles and acronyms. There are many firm and entrenched ideas about how we should go about writing code. The sheer quantity of all of them can be overwhelming, making it especially hard to know which path to take when designing an abstraction. JavaScript's ability to accommodate many different paradigms is one of its strengths as a programming language, but it can also make our job harder. It's up to JavaScript programmers to implement their own paradigms.

This chapter, in the hope of making things less complicated, will take various well-known principles and break them down so we can see their underlying intent. We will explore how these principles relate to the tenets of clean code that we have already discussed, enabling us to make our own informed decisions as to what approaches to use in pursuit of clean code. 

We'll be covering both object-oriented and functional programming principles. By exploring this range of principles, we'll be able to craft, for ourselves, a map of guiding ideas that will enable us to think critically about how to write clean code in whatever paradigm we're engaged in.

In this chapter, we will be covering the following topics:

• The Law of Demeter (LoD)
• SOLID
• The abstraction principle
• Functional programming principles