Functional Programming in JavaScript

I think there's a lot of developers out there. I didn't know. Same with me. It was all JavaScript based. With React as well, everything is very functional. You've got pure React components which are immutable and they always return the same thing. There's two specific things that you need to know to understand what functional programming is. If you want to change data in an array, you just return a new array with the changes. Things are completely immutable and don't change the original. They act as if for the first time every single time.