What does callback do in node JS?
Node. js, being an asynchronous platform, doesn’t wait around for things like file I/O to finish – Node. js uses callbacks. A callback is a function called at the completion of a given task; this prevents any blocking, and allows other code to be run in the meantime.
Can callbacks be synchronous in nature?
js all callbacks are synchronous unless you do something like setTimeOut or process. js it’s more complicated: e.g. you can do file reading both synchronously and asynchronously. Then you just need to know that the callback is asynchronous by nature.
What are the uses of Node JS and Angular JS?
Both Node.js and AngularJS platforms are targeted at building web applications using JavaScript. However, both of them are different in their architecture and working. Node.js mainly used to build server-side applications . AngularJS is suited for building single-page client-side web applications.
What is Node JS process?
Node.js Process. Node.js provides the facility to get process information such as process id, architecture, platform, version, release, uptime, upu usage etc. It can also be used to kill process, set uid, set groups, unmask etc. The process is a global object, an instance of EventEmitter, can be accessed from anywhere.
What is a Node JS promise?
Promises is a JavaScript library and node.js module to allow easier handling of asynchronous flows. It is written in CoffeeScript but is easily used in any JavaScript applications. Promises (or deferreds) allow a more concise and easily readable way to deal asynchronous data. They are often desirable over callbacks.
How to dockerize Node JS app?
Create a simple nodejs app. Now you have package.json file with express as a dependency in it.