npm init

which will ask you about basic facts about your projects, including license identifier.

When an event "fires" (which means the same as "publishing an event" or "emitting an event"), each listener will be called synchronously (source), along with any accompanying data that was passed in to emit(), no matter how many arguments you pass in:

myDog.on('bark', (howLoud, howLong, howIntense) => {
  // handle the event
})
myDog.emit('bark', 'loudly', '5 seconds long', 'fiercely')

The listeners will be called in the order they were registered:

myDog.on('urinate', () => console.log('My first thought was "Oh-no"'))
myDog.on('urinate', () => console.log('My second thought was "Not my lawn :)"'))
myDog.emit('urinate')
// The console.logs will happen in the right order because they were registered in that order.

But if you need a listener to fire first, before all of the other listeners that have already been added, you can use prependListener() like so:

myDog.prependListener('urinate', () => console.log('This happens before my first and second thoughts, even though it was registered after them'))

If you need to listen to an event, but you only want to hear about it once, you can use once instead of on, or prependOnceListener instead of prependListener. After the event is fired and the listener gets called, the listener will automatically be removed, and won't be called again the next time the event is fired.

Finally, if you want to remove all of the listeners and start over, feel free to do just that:

myDog.removeAllListeners()

When dealing with child processes, all of the asynchronous methods will return an instance of ChildProcess, while all the synchronous versions will return the output of whatever was run. Like other synchronous operations in Node.js, if an error occurs, it will throw.

The Node.js Documentation has a more complete guide to clusters here

The urls used in the above examples reference a specific version of Node Version Manager. It is most likely that the latest version is different to what's being referenced. To install nvm using the latest version, click here to access nvm on GitHub, which will provide you with latest urls.

Node.js uses streams to handle incoming data.

Quoting from the docs,

A stream is an abstract interface for working with streaming data in Node.js. The stream module provides a base API that makes it easy to build objects that implement the stream interface.

To handle in request body of a POST request, use the request object, which is a readable stream. Data streams are emitted as data events on the request object.

  request.on('data', chunk => {
    buffer += chunk;
  });
  request.on('end', () => {
    // POST request body is now available as `buffer`
  });

Simply create an empty buffer string and append the buffer data as it received via data events.

NOTE

1. Buffer data received on data events is of type Buffer
2. Create new buffer string to collect buffered data from data events for every request i.e. create buffer string inside the request handler.

Though Node has many framework to help you getting your server up and running, mainly:

Express: The most used framework

Total: The ALL-IN-ONE UNITY framework, that have everything and do not depend on any other framework or module.

But, there is always no one size fits all, so developer may need to build his/her own server, without any other dependency.

If the app i accessed through external server, CORS could be an issue, a code to avoid it had been provided.

Virtual Directory / Nested Application with Views Pitfall

If you're going to be using Express to render views using a View Engine, you'll need to pass the virtualDirPath value in to your views

`res.render('index', { virtualDirPath: virtualDirPath });`

The reason for doing this is to make your hyperlinks to other views host by your app and static resource paths to know where the site is being hosted without needing to modify all views after deployment. This is one of the more annoying and tedious pitfalls of using Virtual Directories with IISNode.

Versions

All of the examples above work with

• Express v4.x
• IIS 7.x/8.x
• Socket.io v1.3.x or greater

The Installing grunt guide has detailed information about installing specific, production or in-development, versions of Grunt and grunt-cli.

The Configuring Tasks guide has an in-depth explanation on how to configure tasks, targets, options and files inside the Gruntfile, along with an explanation of templates, globbing patterns and importing external data.

The Creating Tasks guide lists the differences between the types of Grunt tasks and shows a number of sample tasks and configurations.

We have covered the basic and most commonly used operations in node_redis. You can use this module to leverage the full power of Redis and create really sophisticated Node.js apps. You can build many interesting things with this library such as a strong caching layer, a powerful Pub/Sub messaging system and more. To know more about the library check out their documentation.

Answer: Click Here

More information can be found here: http://mongoosejs.com/docs/guide.html

We have assumed that we will have a local instance of mssql database server running on local machine . You can refer this document to do the same .

Also make sure you appropriate user created with privileges added as well.

Understanding the Event Loop is important to understand how and why to use multiple threads.

There are several other Active Directory APIS, such as activedirectory2 and adldap.

Using require() allows code to be structured in a way similar to Java's use of classes and public methods. If a function is .export'ed, it can be require'ed in another file to be used. If a file is not .export'ed, it cannot be used in another file.