Einar  Hintz

Einar Hintz


Fix Memory Leaks in JavaScript

Memory leak is referred to a scenario where the memory used by the application is not released even after use. This could cause the operating system to allocate way more memory to the application than required. In the presence of a memory leak the memory allocation is progressive. This memory consumption by the application will keep increasing until the operating system runs out of it.

Imagine you invite some guests over for dinner and they take your beautiful ceramic plate and refuse to let it go after dinner. And then very graciously go on and take more until they have it all. That’s basically memory leak. Let’s see what is so different about memory leaks in JavaScript.

Memory Management in JavaScript

Generally memory management has 3 processes:

1. Allocation

2. Usage

3. Collection/Release

Every object/variable that you create goes through these 3 stages. Here we are concerned about the last process: Collection/Release. In JavaScript, this process is implicit and is called garbage collection.

Unfortunately, this convenience makes us overlook the memory usage of our application and results in web applications that uses much more memory than it really should. Even worse, this makes memory leak more likely to occur within even the simplest applications.

So how do you identify a memory leak?

Identifying a Memory Leak

  1. Preliminary test for memory leak:
  2. When you navigate to a page in a web application and the performance degrades progressively over a period of time, it could be an indication of a memory leak. However its not conclusive, since it is only a sign of heavy resource consumption, it could be poor network or heavy CPU consumption too.
  3. Secondary test for memory leak:
  4. You can simple open task manager within chrome and watch for the memory footprint there for this particular tab. If it keeps increasing, there is a high chance that there is a memory leak.
  5. Conclusive test for memory leak:
  6. The first two tests, although effective, can only detect medium to severe memory leaks. Sometimes memory leaks are really small and only show their effects over long periods of time. This method can detect even the smallest memory leak. Hence, this is the recommended method to make sure your guests don’t take all your plates. This involves using the performance feature of Chrome inspector.

#programming #software-development #web-development #javascript

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Fix Memory Leaks in JavaScript

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

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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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Eldora  Bradtke

Eldora Bradtke


JavaScript Memory Management System

The main goal of this article is to help to readers to understand how memory management system performs in JavaScript.

I will use a shorthand such as GC which means Garbage Collection. When the browsers use Javascript, they need any memory location to store objects, functions, and all other things. Let’s deep in dive that how things going to work in GC.

Image for post

The JavaScript Engine’s Garbage collector’ looks out for objects which are unreachable and also removed from the memory.

So I will share an example below and show you steps that will be needed to work with GC.

var number = 50;                // allocates memory for a number

var string = 'textual data';  // allocates memory for a string
var object = {x: 10};         // allocates memory for an object
var x= [10, null, 'abra'];     // allocates memory for the array
function f(x) {               // allocates memory for a function
return x * 2;

The example shows how JavaScript allocates memory for the variables when they declare. But when the memory is no longer needed, the allocated memory will be released. GC finds the memory no longer used by the application and releases it. But the main question is that how GC finds the memory no longer used?

The basic algorithm for doing that is called “mark-and-sweep”.

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Ajay Kapoor


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