Asynchronous Programming in NodeJS

Being a backend developer, I understand how people tend to get confused between the asynchronous and synchronous behaviour of NodeJS. Through this blog I will explain the asynchronous behaviour of NodeJS and answer all your HOWs and WHYs!

Drop off the confusion and read along. Let’s get started!

_If you read any article about NodeJS , you will find something very common coming up . These four terms describe the nature of NodeJS- __Asynchronous, Non blocking, Single threaded and Event driven. _In Node programming model almost everything is done asynchronously but many of the functions in NodeJS core have both synchronous and asynchronous versions.

Let’s first understand what a synchronous programming model is.

SYNCHRONOUS PROGRAMMING MODEL

In synchronous programming, one line runs after the next regardless of how long each line takes to execute.

A very basic and simple example is:

console.log("start")
console.log("end")

The output will first print start then it will print end. This shows the sequential execution of code.

Let’s make it clearer with another example:

var fs = require('fs');
var content = fs.readFileSync("file.txt", "utf8");
console.log(content);
console.log("Last One");

_readFileSync() will read the entire file and store it into the memory and then go to print the data and a message in the console (see the output). This is the synchronous version, _everything is paused until the file is finished reading.

#nodejs #javascript #backend development

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Dart asynchronous programming: Streams

This article covers one of the fundamentals of reactive programming: streams, which are objects of type [Stream](https://api.dart.dev/stable/dart-async/Stream-class.html).

If you’ve read the previous article on futures, you might remember that each future represents a single value (either an error or data) that it delivers asynchronously. Streams work similarly, but instead of a single thing, **a stream can deliver zero or more values and errors **over time.

This article is the third one based on the Flutter in Focus video series Asynchronous Programming in Dart. The first article, Isolates and event loops, covered the foundations of Dart’s support for background work. The second one, Futures, discussed the _Future_ class.

If you think about the way a single value relates to an iterator of the same type, that’s how a future relates to a stream.

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How to Install NodeJS on Ubuntu 19.04

Overview
In this tutorial, you will learn how to install Node onto Ubuntu 19.04 Disco Dingo. We will cover installation from the default repositories and, for those wanting more recent releases, how to install from the NodeSource repositories.

Installing from Ubuntu
The Ubuntu 19.04 Disco Dingo repository includes NodeJS version 10.15. Like most packages found here, it certainly is not the most recent release; however, if stability is more important than features, it will be your preferred choice.

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Decoding Nodejs

The main goal of this blog is to explain the “Architecture of Nodejs” and to know how the Nodejs works behind the scenes,

Generally, most of the server-side languages, like PHP, ASP.NET, Ruby, and including Nodejs follows multi-threaded architecture. That means for each client-side request initiates a new thread or even a new process.

In Nodejs, all those requests from the clients are handled in a single-thread using shared resources concurrently as It follows the “Single-Threaded Event Loop Model”.

ARCHITECTURE OF NODEJS

What Is EVENT-LOOP?

Event-Loop programming is a flow control in an application-defined by events. The basic principle of Nodejs’s event-driven loop is implementing a central mechanism that hears for events and calls the callback function once an event is turning up.

Nodejs is an event-loop that implements a run-time environment model to achieve non-blocking asynchronous behavior runs on Google Chrome’s V8 engine.

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