Apart from following the best practices when we write JSX and use a linter to enforce consistency and find errors earlier, there is one more thing we can do to clean up our code: follow a functional programming (FP) style.

As discussed in Chapter 1, Taking Your First Steps with React, React has a declarative programming approach that makes our code more readable.

FP is a declarative paradigm, where side-effects are avoided, and data is considered immutable to make the code easier to maintain and to reason about.

Don't consider the following section an exhaustive guide to functional programming; it is only an introduction to get started with some concepts that are commonly used in React of which you should be aware.