Condo Mark

Condo Mark

1581490925

How To Implement Private & Privileged Functions in JavaScript 2020

Introduction

In an object-oriented language like C# or Java, there are private and public members like variables and functions. If I declared a member of the class as private, then this is available inside that class. Only outside of the class it’s not accessible. Javascript is object-oriented, so it has private and public members.

Below is the code for the private variable.

Note: Private variables are declared using the var keyword inside the object. This can access only private functions.

function DisplayFullname(firstname,lastname)  
{  
  
    // this are public fields  
    this.FirstName=firstname;  
    this.LastName=lastname;  
  
    // this is Private variable which is accessible only inside of this constructor function.  
    var fullname=this.FirstName+" "+this.Lastname;    
  
}  

In the above code, fullname is a private variable and is not accessible outside of that function. It’s accessible only inside of that function.

Below is the code for that private function which is accessible inside of the constructor function.

function DisplayFullname(firstname,lastname)  
{  
  
    // this are public fields  
    this.FirstName=firstname;  
    this.LastName=lastname;  
  
    // this is Private variable which is accessible only inside of this constructor function.  
    var fullname="";  
  
    var getFullName=function()  
    {  
        fullname=this.FirstName+" "+this.LastName;  
        return fullname;  
    }  
  
}  

Privileged Function

The function declared using this keyword is called a privileged function. In the below code, previlageFunction is an example of a privileged function.

function DisplayFullname(firstname,lastname)  
{  
  
    // this are public fields  
    this.FirstName=firstname;  
    this.LastName=lastname;  
  
    // this is Private variable which is accessible only inside of this constructor function.  
    var fullname="";  
  
    var getFullName=function()  
    {  
        fullname=this.FirstName+" "+this.LastName;  
        return fullname;  
    }  
  
    this.previlageFunction=function()  
    {  
        return getFullName();  
    }  
}  

What is a Privileged Function?

  1. The Privileged function is created using this keyword and in the constructor function, public methods are created using a prototype property of the constructor function.

  2. The Privileged function can access the private variables and private method of the constructor function.

  3. Public methods have to access privileged methods but not private methods.

  4. Privileged methods are also accessible outside the constructor function.

function DisplayFullname(firstname,lastname)  
{  
  
    // this are public fields  
    this.FirstName=firstname;  
    this.LastName=lastname;  
  
    // this is Private variable which is accessible only inside of this constructor function.  
    var fullname="";  
  
    //private function  
    var getFullName=function()  
    {  
        fullname=this.FirstName+" "+this.LastName;  
        return fullname;  
    }  
  
    //privileged function  
    this.previlageFunction=function()  
    {  
        return getFullName();  
    }  
  
    //public fucntion  
    DisplayFullname.prototype.publicgetFullName=function(){  
            return this.previlageFunction();  
    }  
}  
  
var dis=new DisplayFullname("Sagar", "Jaybhay");  
document.writeln(dis.FirstName); // Sagar  
document.writeln(dis.LastName);// Jaybhay  
document.writeln(dis.previlageFunction());// undefined  
document.writeln("<br/>");  
document.writeln(dis.fullname);//undefined  
document.writeln("<br/>");  
document.writeln(dis.publicgetFullName());//undefined  

Private Functions

This function can only be called by the privileged function. Below is the syntax of creating a private function.

var getFullName=function()  
{  
    fullname=this.FirstName+" "+this.LastName;  
    return fullname;  
}  

Thank for reading!

#javascript #developer #programming

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Buddha Community

How To Implement Private & Privileged Functions in JavaScript 2020
Brain  Crist

Brain Crist

1594753020

Citrix Bugs Allow Unauthenticated Code Injection, Data Theft

Multiple vulnerabilities in the Citrix Application Delivery Controller (ADC) and Gateway would allow code injection, information disclosure and denial of service, the networking vendor announced Tuesday. Four of the bugs are exploitable by an unauthenticated, remote attacker.

The Citrix products (formerly known as NetScaler ADC and Gateway) are used for application-aware traffic management and secure remote access, respectively, and are installed in at least 80,000 companies in 158 countries, according to a December assessment from Positive Technologies.

Other flaws announced Tuesday also affect Citrix SD-WAN WANOP appliances, models 4000-WO, 4100-WO, 5000-WO and 5100-WO.

Attacks on the management interface of the products could result in system compromise by an unauthenticated user on the management network; or system compromise through cross-site scripting (XSS). Attackers could also create a download link for the device which, if downloaded and then executed by an unauthenticated user on the management network, could result in the compromise of a local computer.

“Customers who have configured their systems in accordance with Citrix recommendations [i.e., to have this interface separated from the network and protected by a firewall] have significantly reduced their risk from attacks to the management interface,” according to the vendor.

Threat actors could also mount attacks on Virtual IPs (VIPs). VIPs, among other things, are used to provide users with a unique IP address for communicating with network resources for applications that do not allow multiple connections or users from the same IP address.

The VIP attacks include denial of service against either the Gateway or Authentication virtual servers by an unauthenticated user; or remote port scanning of the internal network by an authenticated Citrix Gateway user.

“Attackers can only discern whether a TLS connection is possible with the port and cannot communicate further with the end devices,” according to the critical Citrix advisory. “Customers who have not enabled either the Gateway or Authentication virtual servers are not at risk from attacks that are applicable to those servers. Other virtual servers e.g. load balancing and content switching virtual servers are not affected by these issues.”

A final vulnerability has been found in Citrix Gateway Plug-in for Linux that would allow a local logged-on user of a Linux system with that plug-in installed to elevate their privileges to an administrator account on that computer, the company said.

#vulnerabilities #adc #citrix #code injection #critical advisory #cve-2020-8187 #cve-2020-8190 #cve-2020-8191 #cve-2020-8193 #cve-2020-8194 #cve-2020-8195 #cve-2020-8196 #cve-2020-8197 #cve-2020-8198 #cve-2020-8199 #denial of service #gateway #information disclosure #patches #security advisory #security bugs

Vincent Lab

Vincent Lab

1605017502

The Difference Between Regular Functions and Arrow Functions in JavaScript

Other then the syntactical differences. The main difference is the way the this keyword behaves? In an arrow function, the this keyword remains the same throughout the life-cycle of the function and is always bound to the value of this in the closest non-arrow parent function. Arrow functions can never be constructor functions so they can never be invoked with the new keyword. And they can never have duplicate named parameters like a regular function not using strict mode.

Here are a few code examples to show you some of the differences
this.name = "Bob";

const person = {
name: “Jon”,

<span style="color: #008000">// Regular function</span>
func1: <span style="color: #0000ff">function</span> () {
    console.log(<span style="color: #0000ff">this</span>);
},

<span style="color: #008000">// Arrow function</span>
func2: () =&gt; {
    console.log(<span style="color: #0000ff">this</span>);
}

}

person.func1(); // Call the Regular function
// Output: {name:“Jon”, func1:[Function: func1], func2:[Function: func2]}

person.func2(); // Call the Arrow function
// Output: {name:“Bob”}

The new keyword with an arrow function
const person = (name) => console.log("Your name is " + name);
const bob = new person("Bob");
// Uncaught TypeError: person is not a constructor

If you want to see a visual presentation on the differences, then you can see the video below:

#arrow functions #javascript #regular functions #arrow functions vs normal functions #difference between functions and arrow functions

Madyson  Reilly

Madyson Reilly

1601069940

Function Expression vs Function Declaration in JavaScript

Function Expression vs Function Declaration in JavaScript.

It was until during one of the JavaScript mock interviews did I came across the term function expression.

The question was: What is the difference between these two syntax?

function x(){

}

let x = function(){

}

I was clueless for a moment. After thinking a little, I could only come up with: the second syntax invokes an _anonymous _function and is assigned to a variable.

I was alien to the term hoisting.

In this article, we will acquaint ourselves with three simple terms: function declaration,_ function expression, _and hoisting.

What is function declaration?

Function declaration is also known as _function statement. _It contains the name of the function, parameters, and a return statement. **Naming the function **is what sets function declaration apart. Parameters and return statement is optional.

Image for post

Function Declaration

What is function expression?

Function expression also has a name, parameters, and return statement. All of which are optional. The important thing to bear in mind is: the function here is _assigned _to a JavaScript variable.

Image for post

Function Expression

#function-expression #function-declaration #functions-in-javascript #coding #javascript #express

Lowa Alice

Lowa Alice

1624410000

JavaScript Factory Functions

JavaScript factory functions made simple.

📺 The video in this post was made by Programming with Mosh
The origin of the article: https://www.youtube.com/watch?v=jpegXpQpb3o&list=PLTjRvDozrdlxEIuOBZkMAK5uiqp8rHUax&index=9
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#javascript #factory functions #functions #javascript factory functions

Lowa Alice

Lowa Alice

1624392000

JavaScript Constructor Functions. IN JUST 6 MINUTES!!!

JavaScript Constructor Functions made simple.

📺 The video in this post was made by Programming with Mosh
The origin of the article: https://www.youtube.com/watch?v=23AOrSN-wmI&list=PLTjRvDozrdlxEIuOBZkMAK5uiqp8rHUax&index=10
🔥 If you’re a beginner. I believe the article below will be useful to you ☞ What You Should Know Before Investing in Cryptocurrency - For Beginner
⭐ ⭐ ⭐The project is of interest to the community. Join to Get free ‘GEEK coin’ (GEEKCASH coin)!
☞ **-----CLICK HERE-----**⭐ ⭐ ⭐
Thanks for visiting and watching! Please don’t forget to leave a like, comment and share!

#javascript #functions #constructor #constructor functions #javascript constructor functions