As a JavaScript developer, every developers should know about What is a callback function is, Why it is there and what are the pros and cons of using it. In this short article I am going to discuss about those things. What is a Callback function? A callback function is a function passed into another…

In Java, we have primitive data types such as long, short, Boolean, int, float and so on. You can use wrapper classes to convert primitive data types to objects like this: public static void Calculation() { int a = 2; Integer obj = new Integer(a); System.out.println(obj.toString()); } In this code…

Amazon Web Services provides scalable, reliable, and low-cost cloud infrastructure. The most commonly used storage services in AWS is S3 (Simple Storage Service). This service enables users to store and retrieve data at any time. In S3, the place where we store our data into Buckets (here we don’t use…

Why to install Python2 Most of the applications are now shifted to Python3 and becoming re-written source code. But somehow, some of the not evolving scripts which were written on Python2 needs to be executed with the help of Python2. To install Python2 sudo apt install python-minimal The above command will download the Python2 last version (2.7.15). …

This process will sometimes trouble you at some point. Because software maintenance & upgrade will cost a lot; unless we are aware of what we are doing. In this post, I wanted to bookmark myself the process of updating all node dependencies in the package.json …

Relational Database Management System is working under main properties. Those properties abbreviated term is called as ACID. Before or after a transactions happen in a database, these 4 properties will be followed to maintain the integrity of a database management system. Atomicity: A transaction must be atomic. Transaction should happen…

I started learning Python a year back and implemented some simple scripts to automate some manual tasks. E.g: Read CSV files and analyzing Download YouTube videos by giving the link Updating Webpages through Rest API So, while implementing all theses I have gone through the keywords like Module, Package and…

In the last article we explored about Abstract Factory Pattern. In this article we are going to learn about a new Decorator Pattern which is belongs to Structural Design Pattern. The Decorator Pattern allows users to add new functionalities to an existing object without making any changes to previously written…

The Abstract Factory is called a factory of factories. In the previous article, we have seen the Simple Factory and Factory Method patterns. This patter too comes under the Creational Pattern category. This provides one of the best ways to create an object. Abstract Factory relies on object composition. Object…