Recursion and folding in JavaScript

These are examples of using recursion and folding (aka reduce) in JavaScript. Starting point is master branch, solutions we came up with were pushed to solved.

React App

For a somewhat more advanced example of using recursion in the context of a React app:

• https://codesandbox.io/s/4r6l0z307w
• https://codesandbox.io/s/73386x7o06