Chapter 2. Fundamentals of Functional Programming

By now, you've seen a small glimpse of what functional programming can do. But what exactly is functional programming? What makes one language functional and not another? What makes one programming style functional and not another?

In this chapter, we will first answer these questions and then cover the core concepts of functional programming:

Using functions and arrays for control flow
Writing pure functions, anonymous functions, recursive functions, and more
Passing functions around like objects
Utilizing the map(), filter(), and reduce() functions