We will use this as our textbook:

First three chapters of React Up and Running https://www.safaribooksonline.com/library/view/react-up/9781491931813/

React Quickly https://www.manning.com/books/react-quickly

Before proceeding please review your JavaScript:

https://ejohn.org/apps/learn/

Functions as objects:

https://ejohn.org/apps/learn/#16

Learn about Higher Order Functions:

https://www.quora.com/What-is-a-simple-explanation-of-higher-order-functions-and-callbacks-in-JavaScript

https://eloquentjavascript.net/05_higher_order.html

Pure Functions:

https://medium.com/javascript-scene/master-the-javascript-interview-what-is-a-pure-function-d1c076bec976#.9krnps7j2

https://www.nicoespeon.com/en/2015/01/pure-functions-javascript/