Kukuh  Pratama

Kukuh Pratama

1600313284

Understanding Nodejs’s Memory Model, with Examples

Once we begin to type that code, we already introduce bugs and allocating memory without knowing it. How we manage them can make or mar our software.

In this post, we will learn, using examples, about memory leaks in Nodejs and how we can solve them.

In our effort to understand what a memory leak is, let’s first understand the memory model in JavaScript. This memory model visualizes how a JavaScript program is mapped in the RAM during execution.

Let’s take a look.

Memory Model

JavaScript has three portions of memory assigned to a program during execution: Code Area, Call Stack, and Heap. These combined are known as the Address Space of the program.

Image for post

Code Area: This is the area the JS code to be executed is stored.

Call Stack: This area keeps track of currently executing functions, perform computation, and store local variables. The variables are stored in the stack in a LIFO method. The last one in is the first out. Value data types are stored here.

For example:

var corn = 95
let lion = 100

Image for post

Here, corn and lion values are stored in the stack during execution.

Heap: This is where JavaScript reference data types like objects are allocated. Unlike stack, memory allocation is randomly placed, with no LIFO policy. And to prevent memory “holes” in the Heap, the JS engine has memory managers that prevent them from occurring.

class Animal {}// stores `new Animal()` instance on memory address 0x001232
// tiger has 0x001232 as value in stack
const tiger = new Animal()// stores `new Object()` instance on memory address 0x000001
// `lion` has 0x000001 as value on stack
let lion = {
    strength: "Very Strong"
}

Image for post

Here, lion and tiger are reference types, their values are stored in the Heap and they are pushed to the stack. Their values in stack hold the memory address of the location in Heap.

#node #javascript #web-development #developer

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Buddha Community

Understanding Nodejs’s Memory Model, with Examples

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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.

#nodejs #nodejs 10.x #nodejs 11.x #nodejs 12.x #nodejs 8.x

Top NodeJS Mobile App Development Company in USA

AppClues Infotech is one of the leading NodeJS app development company in USA that offering excellent NodeJS development services for web app development. We provide customized and high-quality NodeJS app development services to clients for different industries with advanced technology and functionalities.

Our dedicated app developers have years of experience in NodeJS development and thus successfully deliver cost-effective and highly customized solutions using the robust JavaScript engine of NodeJS.

Why Choose AppClues Infotech for NodeJS Application Development?
• Fast App Development
• Real-Time Application
• JSON (JavaScript Object Notation) in your Database
• Single Codebase
• Lower Cost
• Built-in NPM Support
• Inexpensive Testing and Hosting

For more info:
Website: https://www.appcluesinfotech.com/
Email: info@appcluesinfotech.com
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Arvel  Miller

Arvel Miller

1603068240

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.

#nodejs #nodejs-developer #nodejs-architecture #nodejs-tutorial #backend #javascript #beginners #event-loop

Kukuh  Pratama

Kukuh Pratama

1600313284

Understanding Nodejs’s Memory Model, with Examples

Once we begin to type that code, we already introduce bugs and allocating memory without knowing it. How we manage them can make or mar our software.

In this post, we will learn, using examples, about memory leaks in Nodejs and how we can solve them.

In our effort to understand what a memory leak is, let’s first understand the memory model in JavaScript. This memory model visualizes how a JavaScript program is mapped in the RAM during execution.

Let’s take a look.

Memory Model

JavaScript has three portions of memory assigned to a program during execution: Code Area, Call Stack, and Heap. These combined are known as the Address Space of the program.

Image for post

Code Area: This is the area the JS code to be executed is stored.

Call Stack: This area keeps track of currently executing functions, perform computation, and store local variables. The variables are stored in the stack in a LIFO method. The last one in is the first out. Value data types are stored here.

For example:

var corn = 95
let lion = 100

Image for post

Here, corn and lion values are stored in the stack during execution.

Heap: This is where JavaScript reference data types like objects are allocated. Unlike stack, memory allocation is randomly placed, with no LIFO policy. And to prevent memory “holes” in the Heap, the JS engine has memory managers that prevent them from occurring.

class Animal {}// stores `new Animal()` instance on memory address 0x001232
// tiger has 0x001232 as value in stack
const tiger = new Animal()// stores `new Object()` instance on memory address 0x000001
// `lion` has 0x000001 as value on stack
let lion = {
    strength: "Very Strong"
}

Image for post

Here, lion and tiger are reference types, their values are stored in the Heap and they are pushed to the stack. Their values in stack hold the memory address of the location in Heap.

#node #javascript #web-development #developer