Observer Design Pattern in C#

The Observer Design Pattern is a behavioral design pattern that defines a one-to-many dependency between objects. When one object (the subject) changes its state, all its dependents (observers) are notified and updated automatically. This pattern is widely used in software engineering to establish communication between objects in a loosely coupled manner.

This Design Pattern is widely used for implementing distributed event-handling systems where an object needs to notify other objects about its state changes without knowing who these objects are.

In the Observer Design Pattern, an object (called a Subject) maintains a list of its dependents (called Observers). It notifies them automatically whenever any state changes by calling one of their methods. The Other names of this pattern are Producer/Consumer and Publish/Subscribe.

Components of Bridge Design Pattern

1. Subject: This is the object that is being observed. It maintains a list of observers and provides methods to attach, detach, and notify observers of state changes.
2. Observer: This is the interface that defines the method(s) that the subject will use to notify observers of state changes.
3. ConcreteSubject: This is the concrete implementation of the subject. It maintains the state of interest and notifies observers when changes occur.
4. ConcreteObserver: This is the concrete implementation of the observer. It registers itself with the subject and implements the update method to react to changes in the subject's state.

Standalone Components in Angular

A standalone component is a type of component that doesn’t belong to any specific Angular module.Before Angular version 14, when you created a component, you typically had to include it in the declaration array of a module; otherwise, Angular would throw an error during compilation.Standalone components are independent units that can be instantiated and used anywhere within an Angular application, regardless of the module structure. Standalone components can be useful for creating reusable UI elements or utility functions that are not specific to any module.

In this post, we'll explore standalone components in Angular and how to create them with a detailed example.

Creating a Standalone Component

First, make sure you're using Angular version 14. To create a component on its own, use the --standalone option with the command ng generate component.

ng g c component_name  --standalone

Decorators in Angular

There are several important concepts in Angular, and Decorators are an important concept to learn when you are working Angular. Decorators in Angular are a powerful and essential feature used to enhance and modify the behavior of classes, methods, and properties. Through this post we will learn about decorators, its types and how it is being used in real time applications.

What are Decorators?

Decorators are functions that are invoked with a prefixed @ symbol.Basically, a decorator provides configuration metadata that determines how the component, class or a function should be processed, instantiated and used at runtime.Decorators are applied to classes, class properties, and class methods using the following syntax:

@DecoratorName(arguments)

Angular comes with several built-in decorators, and you can also create custom decorators to extend or modify the behavior of your application.

Bridge Design Pattern in C#

The Bridge Design Pattern is a structural pattern that separates the abstraction from its implementation so that the two can vary independently.This pattern involves an interface that acts as a bridge between the abstraction class and implementer classes. It is useful in scenarios where an abstraction can have several implementations, and you want to separate the implementation details from the abstraction.

Purpose of Bridge Pattern

• Decouple an abstraction from its implementation so that the two can vary independently.
• Promote code reusability by allowing the abstraction and implementation to evolve independently.

Flyweight Design Pattern in C#

The Flyweight design pattern is a structural pattern that focuses on minimizing the memory footprint or computational expenses of an object. It achieves this by sharing as much as possible with related objects, rather than keeping all of the data in each object. This is particularly useful when dealing with a large number of similar objects, as it helps reduce the overall memory consumption and improves performance.

Purpose of Flyweight Pattern:

• To reduce the number of objects and to conserve memory by sharing objects among multiple contexts.
• To achieve performance improvement by minimizing the overhead of creating and managing large numbers of similar objects.