Promisifying Legacy Web APIs Just for Fun

We'll go through the basics of Promises and callbacks, and demonstrate the simplicity of promisifying the old XMLHttpRequest API. It is no longer news that new JavaScript development patterns since the evolution of ES6 have influenced how we approach certain things in the JavaScript ecosystem. For instance, the standard callback function syntax which has been a standard for years. However, a new alternative, Promises, is now a more preferred pattern of development.