Prototype Design Pattern

Prototype Design Pattern: This pattern is used when objects or instances are created by cloning other object or instances. It allows to add any sub class instance of known super class instance. It is used when there are numerous potential classes , that are ready to use when needed.

It falls under creational design pattern. Continue reading “Prototype Design Pattern”

Chain of Responsibility Pattern

Chain of Responsibility Pattern: chain-of-responsibility pattern is a design pattern consisting of a source of command objects and a series of processing objects.

In other words, when a request can be handled by giving more than one object a chance to handle the request. Continue reading “Chain of Responsibility Pattern”

Singleton Pattern

Singleton Pattern: This pattern is used you want to eliminate the option of instantiating more than one object. It means one and only one instance of the class can be instantiated.

In other words, Singleton pattern is used when, A single instance of a class is required in the application and the class itself is able to enforce the single instance on itself. The rest of the system need not worry about managing the single instance. Continue reading “Singleton Pattern”

Factory and Abstract Factory Pattern

Factory Pattern: When a method returns instance one of several possible classes on runtime, bases on input parameters. All these classes must share a common super class.

Factoy Pattern falls under Creational Design Pattern. Continue reading “Factory and Abstract Factory Pattern”

Design Patterns and Gang of Four

Design Pattern: As the name suggests, design patterns are set of patterns used in software design, which provide solution to a commonly occurring problem. Design patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system.

In other words, Design patterns are structured approach to computer programming and its architecture.

Patterns are about reusable designs and interactions of objects.

Gang of Four: The 23 Gang of Four (GoF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral (for a complete list see below). Continue reading “Design Patterns and Gang of Four”

TDD, Unit Tests and Mocking

TDD: Test driven development is a development approach where direction of development is driven by tests. As the name suggests, in TDD, first piece of code to written is test case, then actual piece of code.

Unit Test: Unit test is a programming method to writes test cases for your application. Unit testing is used to break down the functionality of your program to a discrete testable piece. Unit test are also important to create a code coverage report. Thru Unit test, the code and logic written becomes testable and thus reliable. Continue reading “TDD, Unit Tests and Mocking”

C# From Beginning till 6.0

What is C#: C# is an Object-Oriented language

Evolution of C#: Following image shows the journey of C# till 6.0

c_evolution

C# 6.0 new features:

  • Auto-Property Initializer: As name suggests, it allows developer to set the value of the property when it is declared in class. Earlier, one need to set value in the constructor

public class Blog

    {

        public string Name {get; set;}

        public Blog ()

        {

            Name = “Name”;

        }

}

But in C# 6.0 this can be like this

public class Blog

  {

          public string Name {ge; set;} = “Name”;

 }

One can also set different accessor for ‘get, set’ properties Continue reading “C# From Beginning till 6.0”