Best Node Js Course

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Best Node Js Course
B E S T O N L I N E C O U R S E S C O U P O N . C
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Table of contents
About Node js Environment Setup First
application REPL Terminal Callback
concept Event loop and Emitter Buffers and
Streams Global objects and File system Web
module Express Framework
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About Node js
Node.js said to be the real JavaScript based
platform and framework which is mainly built on
Google chromes JavaScript engine. It utilized to
expand the input and output exhaustive web
applications like web applications, single page
applications, and video streaming sites. It is
said to be an open source and it also completely
free which is used by the millions of developer
across the globe.
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Environment Setup
The users dont need to go over their set up to
start learning the node.js. It is a simple user
interface where the node.js has the environment
to learn online. Here you can quickly execute
with many examples over the online at the same
time during your theory work. It gives you the
confidence to check out the result with the
different number of options.
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First application
First of all, before creating the actual
application using the Node.js, we have to check
out the components of the node.js
application. Three types of components Import
required modules Read request and return response
Create server
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REPL Terminal

• REPL stands for the Read Eval Print Loop.
• It mainly represents the computer environment
  setup like UNIX or Linux and Windows console in
  an interactive mode. Node or Node.js comes
  together with the REPL Environment. It also
  mainly performs the tasks such as Read, Print,
  Eval and Loop.
• Main features of REPL of a node are very helpful
  in experimenting to debug JavaScript codes and
  node.js.

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Callback Concept
The callback is said to a synchronous equivalent
for the function. The function of the callback
is mainly called as the completion of the
task. the node makes great usage of the
callback. Here all the APIs of the node are
primarily written in a way which supports the
callbacks. Therefore once the input and output
file is complete, then it will call the call
back function during the period of passing
callback function with the content of the file as
a parameter. For the information, that is there
is no blocking or wait for the input and output
file.
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Event Loop
Node.js uses events heavily and it is also one of
the reasons why Node.js is pretty fast compared
to other similar technologies. As soon as Node
starts its server, it simply initiates its
variables, declares functions and then simply
waits for the event to occur. In an event-driven
application, there is generally a main loop that
listens for events, and then triggers a callback
function when one of those events is detected.
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Event Emitter
Many objects in a Node emit events. for example,
a net.Server emits an event each time a peer
connects to it, an fs.readStream emits an event
when the file is opened. All objects which emit
events are the instances of events.EventEmitter.
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Buffers
Buffer is said to be the pure JavaScript which is
a Unicode- friendly, and it is not for binary
data. Buffer class is a global class that can be
accessed in an application without importing the
buffer module. Node provides Buffer class which
provides instances to store raw data similar to
an array of integers but corresponds to a raw
memory allocation outside the V8 heap.
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Streams
Streams are objects that let you read data from a
source or write data to a destination in
continuous fashion. there are four types of
streams Readable - Stream which is used for read
operation. Writable - Stream which is used for
write operation. Duplex - Stream which can be
used for both read and write operation. Transform
- A type of duplex stream where the output is
computed based on input.
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Global objects
It is said to be global in nature, and that is
mainly available in all the modules. Thus the
user does not need the objects to include in any
application instead of using them directly. The
objects are functions, modules, strings.
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File system
File system is said to be the node which
mainly implements the file input and output using
the wrappers around POSIX functions. Thus the
node file system module is imported by using the
syntax var fs require (fs). The objects are
functions, modules, strings.
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Web module
The web server is the software application which
is mainly handling the HTTP requests that are
sent by the HTTP client web pages and web
browsers to the clients. The servers are usually
delivering the HTML documents with scripts,
sheets, style, and images. Therefore most of the
support the server side scripts and using the
scripting languages or by redirecting the process
to the application server which mainly helps to
receive the data from the database.
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Express Framework

• The express is said to be the flexible and
  minimal Node.js web application framework. It
  provides the robust number of features to
  improve the mobile applications and to develop
  the web.
• It also mainly facilitates the continuous
  development of web applications.

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Features of Express Framework

• It allows rendering the HTML pages which is
  mostly based on the passing arguments to
  templates.
• It also defines the routing table that is used to
  carry out the different movements which are
  based on URL and HTTP method.
• It is mainly allowed to set up the middlewares
  which helps to respond to HTTP requests.

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