Eric schmidt 
GROKKING ALGORITHMS 
Tips and Tricks of Grokking Functional Programming

Many people will tell you that functional programming is tough to grasp, but I’m here to tell you it isn’t. The hardest part is deciding to understand the concepts of functional programming, but once you’ve taken that step, the rest is plain sailing.

Here, let me give you some examples of how functional programming works.

Can you remember when you learned to drive? 

When you saw other people driving, you thought it looked easy. You thought you would have no trouble, but boy, were you wrong!

You practiced hard and learned your local streets before you ventured further afield. You made mistakes but learned from them and eventually passed your test. License in hand, you drove whenever you could, and gradually your confidence increased. Then one day, you needed to buy a new car because yours had packed up. Or a friend asked you to drive their car.