Introduction To Node JS

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  • July 18, 2022
  • Full Stack
node js

Introduction To Node JS

Node.Js  is across-platform runtime terrain and library for running JavaScript operations outside the browser. It’s open source and free to use. the knot used for networking web operations and creating garçon- side. It’s used perfectly for data- ferocious real-time operations indeed- drivennon-blocking I/ O model that makes it featherlight and effective,.Node.js provides a colorful javascript module to simplify the development. 

 Features of Node.js 

  1. Extremely presto.

  2. I/ O is Asynchronous and Event Driven.
    All APInode.js library is asynchronous which meansnonblocking.Node.js grounded garçon noway waits for an API to return data.

  3. Single-threaded
    knot js single threaded model with event looping.
  1. largely Scalable
     It’s largely scalable because event medium helps the garçon to respond in a non-blocking way.
  1. No softening
     operations noway cushion any data.
  1. Open Source 

 

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 * What’s the first-class function in Javascript? 

 When functions can be treated like any other variable also those functions are the first-class functions. Now because of this function can be passed as a param to another function( message) or a function can return another function(advanced-order function). chart() and sludge() are higher-order functions that are popularly used. 

 how does it work? 

 used in developing desktop operations as well with a popular frame called electron as it provides API to pierce zilches- position features similar to the train system, network, etc. 

 manage packages in yournode.js design? 

 Out of them substantially use npm or yarn. Both give nearly all libraries of javascript with extended features of controlling terrain-specificconfigurations. It can be managed by a number of package installers and their configuration train consequently. 

 

 * the way how “ Control Flow ” controls the functions calls? 

 Collect data 

 Limit concurrency 

 Control the order of prosecution 

 Call the following step in the program. 

 

 * some generally used timing features ofNode.js? 

 setTimeout/ clearTimeout 

 setInterval/ clearInterval 

 setImmediate/ clearImmediate 

 

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 * the advantages of using pledges rather of calls 

 The main advantage of using pledge is you get an object to decide the action that needs to be taken after the async task completes. more manageable law and avoids message hell. 

 What’s chopstick in knot JS? 

 It’s generally used to generate child processes. 

 

 * Why isNode.js single-threaded? 

 This was to try a new proposition of doing async processing on a single thread over the being thread-grounded perpetration of spanning via different fabrics. 

 

 * types of API functions are there inNode.js 

  •  Asynchronous,non-blocking functions 
  •  Coetaneous, blocking functions 

 

 * What’s REPL? 

 PL inNode.js stands for Read, Eval, publish, and Loop, which further means assessing law on the go. 

 

 * arguments thatasync.queue takes as input? 

 Task Function 

 Concurrency Value 

 

 * purpose of module.exports? 

 to expose functions of a particular module or train to be used away in the design. 

 used to synopsize all analogous functions in a train which further improves the design structure. 

 

 * What tools can be used to assure a harmonious law style? 

 ESLint can be used with any IDE to insure a harmonious coding style which further helps in maintaining the codebase. 

 

* event- circle in Node JS? 

 The event circle involves different phases with specific tasks similar as timekeepers, pending calls, idle or prepare, bean, check, and close calls with different FIFO queues. iterations it checks for async I/ O or timekeepers and shuts down fairly if there are not any. 

 

 * If Node.js is single threaded also how does it handle concurrency? 

 the main circle is single-threaded and all async calls are managed by libuv library. 

 

 * separate betweenprocess.nextTick() and setImmediate()? 

() sets the message to execute but setImmediate pushes the message in the line to be executed. So the event circle runs in the following manner. 

 Both can be used to switch to an asynchronous mode of operation by listener functions. 

 timekeepers –> pending calls –> idle, prepare –> connections( bean, data, etc) –> check –> close calls. 

() system adds the message function to the launch of the coming event line and setImmediate() system to place the function in the check phase of the coming event. 

 

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 * What’s middleware? 

 It’s substantially used to capture logs and enable rate limit, routing, authentication, principally whatever that isn’t a part of business logic. Middleware comes in between your request and business sense. There is third-party middleware also similar to body-parser and you can write your own middleware for a specific use case. 

 * Explain aboutExpress.js? 

, its fast backend web operation frames a free, open-source, featherlight forNode.js. It’s a single- runner, multi runner or web operation to produce API. 

 

 * Express js is a frontal end or aft end frame? 

 It’s a backend frame. It’s used for making single runners, multi runners, and hybrid runners and we also produce API through Express.

 

Author:-

Sonal Vanarse

SevenMentor Pvt Ltd

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