I'm new at Node.js and i need some practice on it, so is there any online exercises same as http://www.codecademy.com/ for node.js?
Avoid Using Node. js: Processing CPU heavy and complex applications: Node. js uses an event-based, non-blocking I/O architecture and only has one CPU – all of that intensive CPU processing would block incoming requests. As a result of the high-end number crunching, the thread might get stuck.
Node. js is extensively used for back-end development and, according to Stack Overflow Research, is a worldwide leader among frameworks. Many experts say whether is node js worth learning 2023 or not depends on your preferences.
It takes around 3 months to fully learn Node JS and be able to build a functional full-stack application. If you already know some other programming, you can get the basics down within a few week's time. This is because there are so many moving parts that go into building a working app such as a social network.
Node is written in JavaScript. JavaScript is one of the most popular programming languages and nearly every developer is familiar with it. Therefore, learning Node requires less effort and time, even for a junior JavaScript programmer.
There is a node.js course at CodeSchool (the first lesson is free, $29/mo after): http://node.codeschool.com/
Just do the tutorials as you read them. Try setting up a webserver and serving a page that says "hello." I'm not sure you're going to find interactive exercises like codeacademy for something like nodejs.
Again I think your best bet is the previous SO question How do I get started with Node.js
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