Welcome to the functional programming world. The world, which has only functions, living
happily without any outside world dependencies, without states, without mutations forever.
Functional programming is a buzz in recent days. You might have heard about this term within your team, in your local group meeting, and have thought about this.
If you’re already aware of what that means, this is great! But for those who don’t know the term, don’t worry. This chapter is for that purpose: to introduce you to Functional terms in simple English.
We are going to begin this chapter by asking a simple question: what is a function in Mathematics? Then later on we are going to create a function in JavaScript with a simple example using our function definition.
The chapter ends by explaining the benefits that functional programming gives to our developers
