[egghead.io] JavaScript Promises in Depth

This lesson introduces the native JavaScript [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) object and the [`Promise.prototype.then()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then) method. We’re gonna look at how to make an HTTP request using the [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) and how to asynchronously process the response in a promise chain.

In addition, we'll discuss the three mutually exclusive states a promise can be in: *pending*, *fulfilled*, or *rejected*.