Learning Node.js Development

Merits of promises

We now have a promise that can either get resolved or rejected. If it gets resolved, meaning the promise was fulfilled, we have a function that handles that. If it gets rejected, we have a function that handles that as well. This is one of the reasons why promises are awesome. You get to provide different functions, depending on whether or not the promise got resolved or rejected. This lets you avoid a lot of complex if statements inside of our code, which we needed to do in app.js to manage whether or not the actual callback succeeded or failed.

Now inside a promise, it's important to understand that you can only either resolve or reject a promise once. If you resolve a promise you can't reject it later, and if you resolve ...