What is the node.js and its purpose? [duplicate] - javascript

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What is Node.js? [closed]
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Closed 7 years ago.
Okay noob question.
What is node.js?
What is its purpose and where is it used?
They say that it is a server-side technology used to perform parallel operations. Google V8 is the parser and the language is Javascript but I thought that Javascript does not work on server-side. How exactly does node.js do this?
Sorry I tried to look up a good answer for it but I couldn't find any good explanation of node.js. I don't quite get what node.js does from these posts either:
What is Node.js?
What is node.js based on, under the hood?

Node.js is a platform for the JavaScript language that is centered around asynchronous network programming. It contains a set of libraries to help you develop server-side applications with JavaScript
Under the hood, Node.js is running on V8, a JavaScript engine developed by Google.
Hope this helps.

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is there an alternative to javascript for accessing the DOM API? [duplicate]

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Why is javascript the only client side scripting language implemented in browsers? [closed]
(3 answers)
Closed 7 years ago.
Every programming language has many alternatives, however, I could not find any alternative to javascript for accessing the DOM API? Why is this the case?
Thanks.
You have alternatives like Dart, LiveScript, Typescript, Babel and Coffeescript, yet these will be compiled/translated to native Javascript. The reason there is no real alternative is the fact that it is the only standard that is being implemented by all major browser "companies".

Is there a prolog that can be run in JavaScript in the browser [duplicate]

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Prolog systems in Javascript [closed]
(1 answer)
Closed 6 years ago.
I am looking for a version of prolog that can be run in JavaScript in a browser. That is I want to be able to use prolog to embed logical operations in a javascript web application
It's relatively easy to implement a prolog-like in languages that support generators. If you can use es6, you might find the implementation here interesting: https://curiosity-driven.org/prolog-interpreter
The first example of this I came across only worked on firefox but was called yield prolog: http://yieldprolog.sourceforge.net/

Pure JavaScript Programming [closed]

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I'm diving into web development again (first time was an utter failure), and I have some pretty spectacular resources for learning both HTML5 and CSS3. What I want to begin studying next is JavaScript so I can have absolute control over my pages. But before I begin integrating JavaScript into my work, I'd like to use JavaScript solely as a programming language (with console I/O and basic programs) to familiarize myself first. What are the best tools for accomplishing this? Because thus far, I haven't found any browser/tool that approaches the simplicity of writing a source file, and clicking run like you might with a C++ program. Thanks.
Node.js is your best shot.
Node is used for:
Server-side applications (Sails, Express, Socket.io)
Various frontend-related scripting (Grunt, LESS)
You can try Node.js, that allows you to run Javascript programs from commandline. Other than that, Javascript runs in a browser.
I think JetBrains makes the best IDEs in the world. Their support of JavaScript, HTML5, and CSS3 is first-rate. I'd recommend looking at WebStorm as your IDE.
I would recommend jsfiddle.net which allows you to type and run code. I might also suggest codecademy.com which has a very good program to teach you javascript and many other languages as well. There is also a really simple part of there website called "codebits" where you can compile js, html, and css and play around. W3schools.com is also very helpful for reference.
If you are running windows, the Windows Scripting Host (WSH) can run both Visual Basic Scripting and JavaScript... with the JavaScript having full access to things.
Because Microsoft supprorted VB Script over JScript (their version of EMCAScript), it is difficult to find documentation, though it does exist. I have a fair number of admin tools written in JScript.
Because that's not how Javascript works. You can't read user input from console.
You can use any browser's development tools and write Javascript code line by line.

Can Javascript be used for back end? [duplicate]

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Serverside and clientside javascript
(4 answers)
Closed 9 years ago.
I read this article that says that PayPal may leave Java and go with JavaScript. I was amazed of this, does this mean that JavaScript can be used as a server side language like Python, PHP, etc? What I know about JavaScript is that it is a client side language.
Use Node.js
http://nodejs.org/
Node.js is a platform built on Chrome's JavaScript runtime for easily
building fast, scalable network applications. Node.js uses an
event-driven, non-blocking I/O model that makes it lightweight and
efficient, perfect for data-intensive real-time applications that run
across distributed devices.
Current Version: v0.10.23

Uses of javascript, not just for aesthetics but uses on the server side [closed]

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I have read this article (Uses of Javascript), while it is right I know there are other uses of javascript, modern javascript nowadays. I haven't read about node.js and how this one works but I have heard that this one makes js do server-side stuffs?
The question is, what are other uses of javascript, can this replace php and ruby? I know this might not be a good idea for enterprise applications but will work well with medium-size applications, am I right?
What are the other uses of javascript other than the one given in the article?
Javascript can very well be used server side. If you're on an IIS server, you can for example use JScript, nodejs, v8cgi (currently known as TeaJS), or a combination of these. On *nix servers nodejs is a popular framework. Nodejs can even be used to program your own webserver (e.g. using the expressjs framework).
Dive in the given links and see what's possible.
There is TESSEL and Espruino javascript inside microcontroller.
I use Node.js for web application for few years, few projects and really happy so far.
The Express.js + MongoDB makes a perfect match (exactly as PHP + MySQL, 5 years ago). You can find reference on MEAN stack.
It works good no only for small applications. We have medium-size app that could be easily scaled up.
Node.js is not to about substitute PHP or Ruby, but what's happening now is indeed, it's more and more used for web applications nowaday. The reason is simple, Node.js has "web-oriented" core, meaning it's originally created to aim highly productive tcp/http applications. With some progress beautiful web development frameworks appeared on top of Node.js that makes web application development even more easy and fun.
For me, programming Node.js on server makes a lot of sense, since JavaScript is main client-side language (almost without alternatives), so context-switching between client/server programming is less. With practice you get use to some initial JavaScript weirdness and things goes smooth and nice.

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