Mastering JavaScript Promises

Node.js with the Q library

In Chapter 2, The JavaScript Asynchronous Model, we discussed what callback hell is and how we are dealing with using promises. With every language, implementation also changes. The same case is with Node.js. promises in Node.js are implemented in a different way. In Node.js, promises are not only used for dealing with callback hell, instead if a function cannot return a value or throw an exception, it can easily pass on a promise. This is a little different from what we have seen in the previous chapters. From the perspective of Node.js, a promise is an object that represents the return value or that can throw an exception Furthermore, it can also be used as a proxy for a remote object to improve latency.

Let's have ...