Next week, we’ll take our shoehorned ReactPico class, refactor it to be more idiomatic, and publish it as an NPM package so everyone can easily add face recognition to their React apps.

JavaScript is also the most popular coding language. According to the 2018 Stack Overflow Developer Survey, JavaScript has been the most used programming language by developers for six years in a row.

While this sounds pretty straightforward, it doesn’t quite telegraph the kind of power you have with first-class functions. If you write JavaScript, you have probably used higher-order functions ...