What Is Functional Programming? - Kris Jenkins' Blog
blog.jenkster.com/2015/12/what-is-functional-programming.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
This is my take on what functional programming really is, in a way that will make sense to a jobbing programmer just trying to Get Stuff Done.