Summary

In this chapter, you got a taste of functional programming. It is quite different from other programming paradigms such as imperative and object-oriented approaches, and it takes a while to get used to. But when properly applied, it is a very powerful way of structuring programs so that they're more declarative, correct, testable, and have fewer errors.

Even if you don't use pure functional programming in your projects, there are many useful techniques that can be used on their own. This is especially true for the map, reduce, and filter array methods, which can have many applications.

This chapter also only used functionality that's available in native JavaScript. But note that there are also a number of popular libraries available to assist with functional programming. These libraries facilitate practical functional programming concerns such as immutability, side-effect-free functions, composition, and automatic currying.

The topics we covered...