Mastering JavaScript Functional Programming - Second Edition

Key features of JavaScript

JavaScript isn't a purely functional language, but it has all the features that we need for it to work as if it were. The main features of the language that we will be using are as follows: 

• Functions as first-class objects
• Recursion
• Arrow functions
• Closures
• Spread

Let's see some examples of each one and find out why they will be useful to us. Keep in mind, though, that there are more features of JavaScript that we will be using; the upcoming sections just highlight the most important features in terms of what we will be using for FP.