Async Module–Waterfall and Series in Node.js

Async module in Node.js provide a way to structure and organize our JavaScript Asynchronous callbacks code. In traditional coding practice, we nest multiple callbacks in the same function, that creates lot of confusion in code readability and maintainability. Async Module addresses the afore said problem by providing powerful functions through which we can get different… Read More »

HTTP status codes

HTTP(Hypertext Transfer Protocol) status codes are standard response codes given by Web API’s on the Internet. Here, below the list of status codes: 1×× Informational:- 100 Continue 101 Switching Protocols 102 Processing 2×× Success:- 200 OK 201 Created 202 Accepted 203 Non-authoritative Information 204 No Content 205 Reset Content 206 Partial Content 207 Multi-Status 208… Read More »

Understand Inheritance and Polymorphism with example

In this post, we will understand the Inheritance and Polymorphism concept of OOP’S practically. In most of the interviews, interviewers asked these inheritance questions and trying to confuse you but after reading this post you will easily understand and clear all confusion. When you derive a class from a base class, the derived class will inherit all… Read More »

Difference between expression, ng-bind and ng-model

ng-bind and {{}} are basically the same. However, before your application fully loads, sometimes {{}} are visible. ng-bind usually looks a little nicer before everything finishes loading. ng-bind If you have $scope.textFromComponent = “Superman” in your controller. <span ng-bind=”textFromComponent”></span> binds this value within this span element. {{ }} The same behaviour can be achieved using {{}}. These set of… Read More »

JWT Bearer Token based Authentication in .Net Core

In my previous posts, i have explained bearer token based authentication and authorization which is just a string, potentially arbitrary, that is used for authorization. Now, In this post we will implement JSON Web Token (JWT). It is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between… Read More »

Automapper in ASP.NET Core

AutoMapper is an object-object mapper which allows you to solve the problem of manually mapping each property of a class with the same properties of another class. Read in details. How to use Automapper in ASP.NET Core 1) Add the main AutoMapper Package to your solution via NuGet. PM> Install-Package AutoMapper or   2)  Add… Read More »

Method Chaining in Javascript

Method chaining is a technique that can be used to simplify code in scenarios that involve calling multiple functions on the same object consecutively. This chain is just a single expression. It’s easy enough to break this chain down and make each of the calls into separate expressions, but then it would obviously not be… Read More »

API Versioning in Core

ASP.NET API versioning gives you the ability to improve and iterate on API’s without breaking contracts. At times the stagnation of innovation on an API is simply because of legacy decisions that cannot be reversed, especially on public API’s. But versioning can quickly get out of control, especially with custom implementations. The API versioning extensions… Read More »

Difference between Primary, Unique, Candidate and Composite Keys

Primary key: Primary key is a key that is used for uniquely identify the each rows in a table. A primary key cannot be null and cannot be more than one primary key in a table. Where we create a primary key a cluster index is created. But we can change it with non- cluster… Read More »