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.

Proxy Design Pattern in C#

The Proxy Design Pattern is a structural design pattern. that provides a surrogate or placeholder for another object to control access to it.

This pattern comes in handy when we want to add an extra layer of control over the access to an object, such as lazy loading, access control, or logging. In C#, the Proxy Design Pattern is commonly used to create a surrogate object that represents another object.

We can also say that the Proxy is the object the client calls to access the real object behind the scene. Proxy means in place of or on behalf of. That means, In the Proxy Design Pattern, a class represents the functionality of another class.

Component of Proxy Design pattern

• Subject: This is an interface that defines the members that will be implemented by the RealSubject and Proxy class so that the Proxy can be used by the client instead of the RealSubject. In our example, it is the ISharedFolder interface.
• RealSubject: This is a class that we want to use more efficiently by using the proxy class. This class should implement the Subject Interface. In our example, it is the SharedFolder class.

Composite Design Pattern in C#

The Composite Pattern is a structural design pattern that enables us to treat individual and group objects uniformly by creating a hierarchical (tree-like) structure of objects, where both the composite (groups) objects and leaf (individual) objects share a standard interface.

This pattern lets clients treat individual objects and compositions of objects uniformly. That means the client can access the individual objects or the composition of objects in a uniform manner. It’s useful for representing hierarchical structures such as file systems, UI components, or organizational structures.

What are Composite and Leaf classes?

1. The Composite Class — represents a group of objects and can contain other objects (i.e. env_item_collection, env_item_collection_parent, env_root), and
2. the Leaf Class — represents an individual object that cannot contain other objects (i.e. env_item).