Chain of Responsibility Design Pattern: Clean Code Recipe

Chain of responsibility design pattern decouples the sender of a request from its potential receivers. The receivers form a chain, and the request travels along this chain. The first object receives the request. If it’s not interested in the specific request, it forwards it to the next receiver. The request travels until one of the objects processes the request or until we reach the end of the chain. The chain is implemented as a single-linked list with each receiver holding a reference to its successor in the chain. The end of the chain is either a new reference or a reference to a special type.

We can manage the chain of responders dynamically by adding new responders or removing existing ones from the list. In some cases, the responder may forward the request through the chain after it handles it. This way, multiple responders can process the same request. This is how iOS or MacOS handle house clicks and taps on the user interface. The chain of responsibility stands at the core of user event processing in Cocoa and Cocoa Touch.

#ios #swift #design-patterns #clean-code #chain-of-responsibility

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Chain of Responsibility Design Pattern: Clean Code Recipe

Chain of Responsibility Design Pattern: Clean Code Recipe

Chain of responsibility design pattern decouples the sender of a request from its potential receivers. The receivers form a chain, and the request travels along this chain. The first object receives the request. If it’s not interested in the specific request, it forwards it to the next receiver. The request travels until one of the objects processes the request or until we reach the end of the chain. The chain is implemented as a single-linked list with each receiver holding a reference to its successor in the chain. The end of the chain is either a new reference or a reference to a special type.

We can manage the chain of responders dynamically by adding new responders or removing existing ones from the list. In some cases, the responder may forward the request through the chain after it handles it. This way, multiple responders can process the same request. This is how iOS or MacOS handle house clicks and taps on the user interface. The chain of responsibility stands at the core of user event processing in Cocoa and Cocoa Touch.

#ios #swift #design-patterns #clean-code #chain-of-responsibility

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Samanta  Moore

Samanta Moore

1623835440

Builder Design Pattern

What is Builder Design Pattern ? Why we should care about it ?

Starting from **Creational Design Pattern, **so wikipedia says “creational design pattern are design pattern that deals with object creation mechanism, trying to create objects in manner that is suitable to the situation”.

The basic form of object creations could result in design problems and result in complex design problems, so to overcome this problem Creational Design Pattern somehow allows you to create the object.

Builder is one of the** Creational Design Pattern**.

When to consider the Builder Design Pattern ?

Builder is useful when you need to do lot of things to build an Object. Let’s imagine DOM (Document Object Model), so if we need to create the DOM, We could have to do lot of things, appending plenty of nodes and attaching attributes to them. We could also imagine about the huge XML Object creation where we will have to do lot of work to create the Object. A Factory is used basically when we could create the entire object in one shot.

As **Joshua Bloch (**He led the Design of the many library Java Collections Framework and many more) – “Builder Pattern is good choice when designing the class whose constructor or static factories would have more than handful of parameters

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Joseph  Murray

Joseph Murray

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Prototype Design Pattern - Java

Prototype design pattern tutorial

Definition of Prototype pattern

The prototype pattern is a creational design pattern in software development. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects.

Where to use the Prototype pattern

If the cost for creating a new object is expensive and costs resources.

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