Design Patterns Archives

15 Top Web Application Design Patterns with Real Examples

Web application design patterns are a set of guidelines for designing web applications that help developers create applications that are easy to use, maintain, and scale. These patterns are based on best practices and common solutions to common problems that developers face when building web applications. By following these patterns, developers can ensure that their applications are consistent, reliable, and scalable. Web App Design Patterns There are many different types of web application design patterns, including user interface patterns, architectural patterns, and behavioral patterns. User interface patterns focus on the design of the user interface, such as the layout, navigation, and interaction elements. Architectural patterns focus on the overall structure of the application, such as the separation of concerns and the organization of code. Behavioral patterns focus on how the application responds to user input and other events, such as error handling and data validation. At their core, web application…

Use the Abstract Factory Pattern | PHP Code Examples in 2023

Using the Abstract Factory Pattern in PHP The Abstract Factory Pattern is a creational design pattern that provides an interface for creating families of related or dependent objects without specifying their concrete classes. The pattern encapsulates the creation of objects within a factory object, which is responsible for creating the appropriate objects based on the parameters passed to it. The Abstract Factory Pattern is useful in situations where there is a need to create families of related objects that work together seamlessly, but the specific types of objects to be created are not known until runtime. Using an abstract factory to create the objects, the client code can be decoupled from the concrete classes that implement the objects, allowing for greater flexibility and extensibility of the software system. Article Highlights The Abstract Factory Pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes.…

Chain of Responsibility Design Pattern | PHP Code Examples

Using the Chain of Responsibility Pattern in PHP The Chain of Responsibility is a behavioral design pattern that allows you to create a chain of objects, where each object in the chain has the ability to either handle a request or pass it on to the next object in the chain. The pattern decouples the sender of a request from its receiver by allowing more than one object to handle the request and provides a way to handle the request in a flexible and extensible manner. In this pattern, the objects are linked together to form a chain, and each object in the chain holds a reference to the next object in the chain. When a request is received, the first object in the chain will attempt to handle it. If it cannot handle the request, it will pass it on to the next object in the chain, and so…

Use the Mediator Design Pattern | PHP Code Examples in 2023

Using the Mediator Pattern in PHP The mediator pattern is a behavioral design pattern that simplifies the complex relationship between objects and lets them communicate indirectly via a mediator object. Article Highlights The mediator object helps reduce the complex dependencies between the entities by acting as a central entity of control. Benefit - Reduces coupling between entities and simplifies their relationship. Con - The mediator object can sometimes become the all-knowing object. Mediator Design Pattern PHP Code Example <?php interface Mediator { public function send($file, $sender, $exception); public function receive($file); } class SharingMediator implements Mediator { private $peers; //Array of users (peers) public function __construct($peers) { $this->peers = $peers; } public function send($file, $sender, $exception) { //1. Apply business logic. //2. Apply exception. //3. Send file to peers. } public function receive($file, $peer) { //1. Apply business logic //2. Receive file from a sender } } class User { private…

Use the Memento Design Pattern | PHP Code Examples in 2023

Using the Memento Pattern in PHP The memento pattern is a behavioral design pattern which lets you save and restore an object to its previous state without compromising its privacy. Article Highlights The memento pattern delegates creating a snapshot to the original object while keeping the state in a memento object. Benefit - Doesn’t violate the data encapsulation of the original objects. Con - Creating memento objects too often can consume much memory. Memento Design Pattern PHP Code Example <?php interface Originator { public function createSnapshot(); } // The originator class class WhiteBoard implements Originator { private $fontSize; private $fontFamily; private $canvasSize; private $canvasColor; private $output; //More fields... function __construct($fontSize, $fontFamily, $canvasSize, $canvasColor, $output) { $this->fontSize = $fontSize; $this->fontFamily = $fontFamily; $this->canvasSize = $canvasSize; $this->canvasColor = $canvasColor; $this->output = $output; } function setFontSize($fontSize) { $this->fontSize = $fontSize; } function setFontFamily($fontFamily) { $this->fontFamily = $fontFamily; } function…

Use the Command Design Pattern | PHP Code Examples in 2023

Using the Command Pattern in PHP The command pattern is a behavioral design pattern that encapsulates a request into an object (command) that knows all about the receiving entity of this request. It allows you to parameterize objects with different requests, schedules or log requests and supports undoable operations. Article Highlights The command pattern decouples the invoker of action from the receiver by encapsulating the request for action as a separate object (command object). Benefit - You can separate one application layer from another and use command objects to allow communications between the two. Con - The code becomes complicated with all the new command classes in the application Command Design Pattern PHP Code Example <?php interface Command { public function execute(); } class LightOnCommand implements Command { private $light; //Expects reference to the Light object public function __construct($light) { $this->light = $light; } public function execute() { $this->light->switchOn(); }…

Using the State Design Pattern | PHP Code Examples in 2023

Using the State Pattern in PHP The state pattern is a behavioral design pattern that allows an object to alter its behavior when its internal state changes. It appears as if the object changed its class. The first statement makes sense, given that the state diagram is based on the idea of states and corresponding behavioral changes when the state machine transitions between various states. The second statement is more apparent from a client’s perspective because when the object changes its behavior, it appears that it is an instance of some other class. The client doesn’t see all the state transitions that happen within, thus creating a perception that the object changes its class in the runtime. Article Highlights Defines classes for all the states, encapsulating their behaviors. The client delegates actions to the state objects. Benefit - Creates a flexible and maintainable state machine. Cons - Adds as many…

Using the Observer Design Pattern | PHP Code Examples in 2023

Using the Observer Pattern in PHP The observer pattern is a behavioral design pattern that defines a one-to-many relationship between objects such that when the state of an object (publisher) changes, the other objects (subscribers) are notified. Article Highlights The observer pattern has a publisher object which updates all its subscribers when its state changes. Benefits - A change in the state of one entity is propagated to other entities. Con - Sends updates in a random order which can be detrimental if observers have shared data dependency where sequence matters. Observer Design Pattern PHP Code Example <?php interface Publisher { public function registerDisplay($display); public function removeDisplay($display); public function updateDisplays(); } interface Observer { public function update($sportsNews, $politicsNews, $weatherNews); } /* This class represents the publisher class now. NewsData implements publisher and also has an array of references to the subscriber objects. */ class NewsData implements Publisher { private $displays;…

Use the Template Method Design Pattern | PHP Code Examples in 2023

Using the Template Method Pattern in PHP The template method pattern is a behavioral design pattern that defines the steps of an algorithm and allows sub-classes to provide an implementation for one or more steps without affecting the algorithm structure. Article Highlights The template method defines the steps or skeleton of an algorithm and allows sub-classes to override one or more of these steps. Benefit - Helps remove code duplication, making the system less rigid to changes. Con - May limit flexibility in tinkering with the steps of an algorithm. Template Design Pattern PHP Code Example <?php abstract class IceTea { public function prepareIceTea() { $this->addBoilWater(); $this->addTeaBag(); $this->addSugar(); $this->brewTea(); $this->addColdWater(); $this->addIce(); } public function addBoilWater() { echo "Adding boil water"."\n"; } public abstract function addTeaBag(); public function addSugar() { echo "Adding sugar"."\n"; } public function brewTea() { echo "Brewing tea"."\n"; } public function addColdWater() { echo "Adding cold water"."\n"; }…

Software Design Pattern Books: 15 Best Reviewed

Books on Design Patterns As a web developer, learning about design patterns is essential to creating clean, efficient, and maintainable code. Design patterns are proven solutions to recurring problems in software development, and they can help you write better code faster. However, with so many design pattern books out there, it can be challenging to know where to start. In this article, we've compiled a list of 10 popular design pattern books for web developers. These books cover a range of programming languages and scenarios. They offer incredible value & insights into best practices and common design patterns used in software development. These books are a great place to begin your journey toward mastering design patterns. Table of Contents Fundamental Books on Design Patterns Language-Specific Design Pattern Books Advanced Design Pattern Books Related Books Fundamental Design Pattern Books for Web Developers Design Patterns: Elements of Reusable Object-Oriented Software "Design Patterns"…

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