Node.js runs JavaScript code in the Event Loop (initialization and callbacks), and offers a Worker Pool to handle expensive tasks like file I/O. Nodejs application runs in single threaded environment. To achieve concurrency, I/O bound operations needs to be handled/run asynchronously. Mistake #...
has made the code very difficult to read and understand. This problem is known asa callback hell or the pyramid of doom. We will cover the details in the following chapters to understand what solutions JavaScript has provided for handling this problem of callback hell. ...
Callback Hell Node Js – JavaScript Callback A Callback is a function “A” that is passed to another function “B” as a parameter. The function “B” executes the code “A” at some point. The invocation of “A” can be immediate, as in a synchronous callback, or, it can occur...
If you’re fairly inexperienced with JavaScript but you’ve used jQuery, then its likely you’ve usedcallback functions. But maybe you don’t fully understand how they work or how they’re implemented. In this post, which is based on what I’ve learned about callback functions in JavaScrip...