Functional programming

In addition to following best practices and using a linter to catch errors and enforce consistency, another way to clean up our code is to adopt an FP style.

As we discussed in Chapter 1, Taking Your First Steps with React, React’s declarative programming approach makes our code more readable. FP is a declarative paradigm as well, where side effects are avoided, and data is considered immutable to make the code easier to maintain and reason about.

While we won’t cover FP in depth in this section, we’ll introduce some concepts commonly used in React that you should be aware of.

FP principles, such as immutability, pure functions, and higher-order functions, can help us write more maintainable and testable code. By treating our data as immutable, we can avoid side effects and make it easier to reason about the flow of our application. Pure functions, which always return the same output for the same input, help us avoid unintended...