How JavaScript Turns Complex Memory Management into Magic

In programming languages like C and C++, there are two types of memory allocation: static and dynamic. Static memory allocation is what happens when we create a global or local variable with a single fixed size. The program allocates once when the program is started and never frees it until the application ends execution. Examples in C and C++ include typed variables and arrays. The other type is dynamic memory allocation. We can create these ‘objects’ with any size using malloc(), and the number of bytes they contain can be altered during runtime using realloc(). We can free the memory things allocated this way manually using free().

an example of what dynamic memory allocation looks like in C

These things can create unforeseen memory leaks as well as complications, like the need to know the difference between a variable(static) and a pointer (dynamic) or between an array (fixed length) and a linked list (with a size that can change dynamically). People have been using C and C++ both for a very long time, and these languages are probably not going away any time soon, but fortunately, many languages today abstract these concepts away from the programmer.

Languages like Java, C#, JavaScript, and Ruby abstract away all of these things away from the programmer using a system known as Garbage Collection. There are a few approaches that the collector like the one in JS uses. Still, the basic idea is something called the Memory Cycle: we allocate the memory, the program uses that memory, and then when the memory is not needed anymore, the garbage collector frees that memory.

#technology #javascript #memory-management #garbage-collection #cplusplus #c

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How JavaScript Turns Complex Memory Management into Magic

In programming languages like C and C++, there are two types of memory allocation: static and dynamic. Static memory allocation is what happens when we create a global or local variable with a single fixed size. The program allocates once when the program is started and never frees it until the application ends execution. Examples in C and C++ include typed variables and arrays. The other type is dynamic memory allocation. We can create these ‘objects’ with any size using malloc(), and the number of bytes they contain can be altered during runtime using realloc(). We can free the memory things allocated this way manually using free().

an example of what dynamic memory allocation looks like in C

These things can create unforeseen memory leaks as well as complications, like the need to know the difference between a variable(static) and a pointer (dynamic) or between an array (fixed length) and a linked list (with a size that can change dynamically). People have been using C and C++ both for a very long time, and these languages are probably not going away any time soon, but fortunately, many languages today abstract these concepts away from the programmer.

Languages like Java, C#, JavaScript, and Ruby abstract away all of these things away from the programmer using a system known as Garbage Collection. There are a few approaches that the collector like the one in JS uses. Still, the basic idea is something called the Memory Cycle: we allocate the memory, the program uses that memory, and then when the memory is not needed anymore, the garbage collector frees that memory.

#technology #javascript #memory-management #garbage-collection #cplusplus #c

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.

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”.

#javascript-development #javascript-tips #javascript-frameworks #javascript #programming

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!");
</script>

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"); */

</script>

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.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

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#hire dedicated javascript developers #hire javascript developers #top javascript developers for hire #hire javascript developer #hire a freelancer for javascript developer #hire the best javascript developers

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.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips