‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful!

React is not an end-to-end JavaScript application framework. It has no support for models or controllers, although there are projects related to React that cover these functions, along with routing.

At Microsoft's Ignite 2017 conference today, the company announced a range of new features that will be coming to its Excel application, such as JavaScript Custom Functions and more.