Reid  Rohan

Reid Rohan


Asynchronous Processing in JavaScript Loops

Over the past three years, I’ve been learning JavaScript and some of its different flavors, frameworks, and libraries. The language is powerful, fun, and is backed by a large open-source community. As a full-stack JavaScript developer, you are truly limited only by your imagination.

Node.js is an asynchronous event-driven runtime for JavaScript. It lets you build highly scalable applications that have great performance. The secret sauce behind Node.js’s high performance is the fact that it goes against the common concurrency model used in other runtimes, frameworks, and languages.

All code in the Node.js process is executed in order from start to finish, however, the process has a single thread which means that it has a single call stack and memory heap. In short, if the thread is not free, code execution is delayed until it is. This is where developers need to exercise extra caution to avoid this performance bottleneck when building their applications. You should always follow a single rule: never block the main thread!

Blocking methods execute synchronously while non-blocking methods execute asynchronously. Blocking methods become dangerous when they consume the main thread and freeze up the entire process. As an example, consider the scenario of an API request made to a web server that takes 100ms to fulfill. Assume 90ms are needed to query a backend database through IO and 10 ms are needed to process and return data back to the client. By choosing non-blocking asynchronous query operations to the database, we can free up 90ms from the main thread which lets us do other things in the background (like process a second or third request) until the data for the first request is returned from the database.

Synchronous Loops

All developers are familiar with the traditional for loop:

for (var i=0; i < arr.length; i++) {
    var item = arr[i];
    // do something with item

This loop is simple, fast, and synchronous which means it will iterate over every element in the array from start to finish. Because of this, you should avoid having any long-running synchronous operations inside this loop because it will freeze up the main thread.

NOTE: A cleaner way of writing this exact same loop is by using the forEach method.

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arr.forEach((item) => {
    // do something with item

Asynchronous Loops

As part of ES7, Javascript  introduced the concept of async /await functions which allow developers to write asynchronous  code that looks and feels like synchronous  code. This is not a problem if the array does not need to be processed  sequentially.

#javascript #programming #software-development #computer-science #coding

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Asynchronous Processing in JavaScript Loops
Lowa Alice

Lowa Alice


JavaScript Loops Tutorial

JavaScript loops made simple.

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Rahul Jangid


What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */


Advantages and Disadvantages of JavaScript

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Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

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Niraj Kafle


The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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Dexter  Goodwin

Dexter Goodwin


The Event Loop Concept and Asynchronous Development in JavaScript

avaScript is easy when all you need is a simple working interface. The problems begin when the interface becomes more complex. Here you need to have a deeper understanding of JavaScript. It is important that even a large and  complex interface remains fast and responsive. Responsiveness is usually achieved through the use of asynchronous functions. This means that you can let your code do several things at the same time without stopping or blocking the main thread.

In this article, I will try to tell you as simply as possible about the work of asynchronous in JavaScript. At all interviews in my life, I have been always asked this question. When you start learning JS, it can seem daunting but in reality, everything is much simpler.

How does the Event Loop work?

Event Loop is one of those things that every JavaScript developer encounters in one way or another. JavaScript provides a concurrency model based on an event loop, which executes the code, collecting and processing events, and performs queued sub-tasks.

Let’s look at an example of a set timeout:

I think it’s not difficult to guess what sequence these logs will be called in. Let’s check.

#event-loop #javascript #js #asynchronous