Best node js course

Best node js course

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  Best Node JsCourse B E S T O N L I N E C O U R S E S C O U P O N . C O
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  Table of contents About Nodejs 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.jssaid to be the real JavaScript based platform and framework which is mainly built on Google chrome’s 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 don’tneed 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 ofall, 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 standsfor 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 callbackis 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 usesevents 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 objectsin 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 saidto 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 objectsthat 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 saidto 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 systemis 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 webserver 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 issaid 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 Itallows 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 middleware’s which helps to respond to HTTP requests.
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