If the preceding section just introduced several new terms that sounded confusing, then don't worry. We'll see what all these promise terms look like in practice, starting with this section. Here, we'll perform some straightforward promise resolving and rejecting.
The resolver is a function that, as the name implies, resolves a promise for us. It's not the only way to resolve a promise—we'll explore more advanced techniques later on in the chapter. But this method is, by far, the most common. It's passed into the executor function as the first argument. This means that the executor can resolve the promise directly by simply calling the resolver. But this wouldn't provide us with much utility, would it?
The common case to a greater extent is for the promise executor function to set up the asynchronous actions that are about to take place—things such as making network calls. Then, in the callback functions for these asynchronous actions, we...