Factory Design Pattern Javascript

The Factory Method Pattern is also known as Virtual Constructor. Let’s discuss adapter design pattern with below example. The observer pattern is a software design pattern in which an object, called the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods. Although there is a diverse list of design patterns used in certain circumstances, JavaScript developers tend to use some patterns customarily more than others. Iterator pattern is useful when you want to provide a standard way to iterate over a collection and hide the implementation logic from client program. Is there some kind of a design pattern that pushes for public statics methods? php,design-patterns. The factory design pattern is a creational pattern. The basic intention of object oriented design - as opposed to procedural design - is that you distribute both data and behaviour to objects. A factory, in this context, is a piece of software that implements one of the "factory" design patterns. Usage of Factory Design Pattern. It is used to create a duplicate object or clone of the current object. thanks for your post, I have a question: reading Head first Design pattern, it seem in the Adapter design pattern get involved a bit od delegation, since all the requests made from the client using target interface, will be done delegating the job to the adaptee object. The contract between pattern variations and what the factory expects is not enforced, but the factory is free to either enforce this by throwing an exception when building the presentation, or returning null (which is essentially treated the same as if the presentation did not exist). Depending on how MVC has been implemented in a framework, it may also use the Factory and Template patterns. I’ll do a post on each section: General discussion and the Simple Factory, the Factory Method Pattern, and the Abstract Factory. The document is intended for a technical audience. JavaScript factory Method design pattern What is the factory method pattern? Basically, by definition you would use the factory pattern whenever you would want a method to return one of several possible classes that share a common superclass. Factory pattern defines an interface for creating an object, but let the classes that implement the interface decide. Typically when a new type is introduced in the system, change is at one place only where the object is created to decide which constructor. A collaborative learning platform for software developers. In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface. Variations of the pattern. Java Design Patterns FAQ: Can you provide an example of the Factory Pattern in Java? Sure. Because of this behaviour of require, singletons are probably the most common Node. Page Factory is an optimized way to create object repository in POM concept. The Factory Method defines a method for creating the objects, which subclasses can then override to specify the derived type that will be created. My projects portfolio is displayed by topic to further display and validate my tech skills. A generic interface for creating objects. This prevents disturbing the entire system for a new type introduction. What is the difference between Singleton vs Factory pattern? A singleton pattern ensures that you always get back the same instance of whatever type you are retrieving, whereas the factory pattern generally gives you a different instance of each type. The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies. Regular readers of this blog will know that I’m a huge proponent of Dependency Injection. Abstract Factory pattern is almost similar to Factory Pattern is considered as another layer of abstraction over factory pattern. The factory design pattern is a creational pattern. Factory method is a creational design pattern, i. Mediator design pattern in java example program code : Java mediator design pattern comes under behavioural design patterns. Its primary purpose is to help you. In this lecture, we will see hands on how easy it is to implement this design pattern in JavaScript. The Observer pattern is usually used in combination with other design patterns: Factory pattern - It's very likely to use the factory pattern to create the Observers so no changes will be required even in the main framework. Deep dive into data structures, algorithms, and design patterns of JavaScript In Detail Are you a developer who is looking forward to gain practical knowledge on data structures, algorithms, and. , related to object creation. Factory Pattern is a pattern that uses factory methods to create objects without specifying the exact class or constructor function from which the object will be created. While the Simple Factory is a nice start and good for many situations it's possible to extend this even further through the use of the Factory Method pattern. A JavaScript pattern and antipattern collection that covers function patterns, jQuery patterns, jQuery plugin patterns, design patterns, general patterns, literals and constructor patterns, object creation patterns, code reuse patterns, DOM and browser patterns (upcoming). When we hear the word Design Pattern, the first question that comes to our mind is, "What are Design Patterns?" Design Patterns are reusable and documented solutions for recurring problems in software development. The benefit is that the client code (calling code) can just say "give me an object that can do XYZ. This gives your. Factory and Abstract factory Introduction Hi friends, Please do not think you get an architecture position by reading interview questions. This prevents disturbing the entire system for a new type introduction. In this article you will learn how to implement Modular Design pattern and OOP in JavaScript. Now we can optimize this code using factory design pattern. md to quicky overview the examples. The Factory Method is a creational design pattern. This course will introduce you to the important Core(Gang Of Four) and Java EE design patterns. Creational. It works with a creator that produces products. Fortunately, writing "good" JavaScript is not too much harder. In this article you will learn Easy and Tricky to Understand the Factory Design Pattern with Real Time. The GoF do not refer to MVC as a design pattern, but rather consider it a set of classes to build a user interface. The PageFactory Class in Selenium is an extension to the Page Object design pattern. POM creates our testing code maintainable, reusable. Factory design pattern is a creation design pattern to localize the object creation code and prevents disturbing the entire system for a new type introduction. Structural Patterns Module. We cover a wide range of topics such as web development, tutorials, photography, design, and more. This article will attempt to provide a brief overview of what design patterns are in the realm of software development, and serve as a jumping-off point for future articles, which will further detail each design pattern, including code examples using C#. F actory is a popular design pattern that we use a lot for creating objects. The Repository Design Pattern, defined by Eric Evens in his Domain Driven Design book, is one of the most useful and most widely applicable design patterns ever invented. But creation of objects in Python is dynamic by design, so. It also allows you to encapsulate object creation so that you can keep all object creation code in one place. Prototype pattern falls under Creational Pattern of Gang of Four (GOF) Design Patterns in. Sample code in JavaScript. Design Pattern :Factory and Reflect in java的更多相关文章 [Design Pattern] Factory Pattern 简单案例. The Powerful Database Factory. As per the design pattern reference book Design Patterns - Elements of Reusable Object-Oriented Software, there are 23 design patterns which can be classified in three categories: Creational, Structural and Behavioral patterns. mdj file in the staruml-design-patterns project. js module pattern js module pattern Search Search. The Factory Method Pattern is also known as Virtual Constructor. Here is the list of all design patterns covered : Creational Design Patterns : Abstract Factory, Builder. Data Access Object or DAO design pattern is a popular design pattern to implement persistence layer of Java application. docx), PDF File (. *FREE* shipping on qualifying offers. The factory method pattern is a creational design pattern which does exactly as it sounds: it's a class that acts as a factory of object instances. Factory From Wikipedia The Factory pattern is a creational design pattern used in software development to encapsulate the processes involved in the creation of objects. Fortunately, writing "good" JavaScript is not too much harder. The factory pattern is one of the creational software design patterns. The factory method pattern approaches the creation of specific types of objects in a different way. Before we jump into code organization patterns, it's important to understand some concepts that are common to all good code organization patterns. Factory pattern is a creational design pattern. JavaScript patterns and antipatterns collection. Advantage of Abstract Factory Pattern. Before learning any design pattern I suggest find out the problem a particular design pattern solves. js Posted by Patrick Steele-Idem on Monday, Jan 12th, 2015 JavaScript , Modules , Design Patterns , Node. In this example, I’ll. In my next article, you will come across the other design patterns, such as Singleton, Builder Pattern, etc. In the last article, we looked at how the facade design pattern can be employed to simplify the employment of any large and complex system using only a simple facade class. Whenever I get to know a cool design pattern or. The Page Object pattern represents the screens of your web app as a series of objects and encapsulates the features represented by a page. So, to me the factory pattern is like a hiring agency. Factory Pattern. The factory method design pattern exists in order to encapsulate an actual class instantiation. They help ensure that when one part of a … - Selection from Learning JavaScript Design Patterns [Book]. The logic for iteration is embedded in the collection itself and it helps client program to iterate over them easily. Gang of four (GOF) have categorized Design Patterns into 3. The best way to see how this works is simply to build one now. Iterator Design Pattern in JDK. Gang of Four Definition: Define an interface for creating an object, but let subclasses decide which class to instantiate. AjaxElementLocatorFactory is a lazy load concept in Page Factory pattern to identify WebElements only when they are used in any operation. Builder Design Pattern with Patterns, design, Creational Design, Abstract Factory Pattern, singleton design patterns, Adapter, Visitor Pattern, Template Pattern. Elegant patterns in modern JavaScript: RORO I wrote my first few lines of JavaScript not long after the language was invented. Gang of four (GOF) have categorized Design Patterns into 3. A factory function is simply a function that returns an object. 0 ] We have a product and we sell to different. Another post, another JavaScript design pattern. Although it is a useful technique, the factory object is not actually one of the gang of four design patterns. General Discussion. Previous Javascript and design pattern knowledge is recommended. Learn Object-Oriented Programming with Java in 250 Steps. Page Factory is an optimized way to create object repository in POM concept. The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies. Relies on inheritance. The basic form of object creation could result in design problems or added complexity to the design. This pattern, is called the Factory Pattern and it allows us to easily create objects in JavaScript. Scenario – 1 [ ADO. It describes how to structure classes to meet a given requirement. The factory pattern is another well-known design pattern, but it is a little more complex. The contract between pattern variations and what the factory expects is not enforced, but the factory is free to either enforce this. Even though the coding examples will be in C++ as I am more comfortable with, they can be…. txt) or read online for free. Any application has to work with persistence and with some kind of list of items. For some reason it's being left behind in any design pattern usage in JavaScript. If we are using factory design pattern then no need create object in UI layer using New keyword. We can create factory class which will handle this task. Dagger Fern Earrings Pattern by Diane FitzgeraldThese free patterns are free with purchase; you will receive them via email once you place your order. Factory Method Design Pattern. This is the 2nd post in a series on techniques, strategies and patterns for writing JavaScript code. The Factory Design Pattern. The chapter on the Factory Pattern in HFDP is pretty long, and divided into three main sections. Factory Method Design Pattern in C++: Before and after Back to Factory Method description Before. JavaScript is disabled on your browser. using the Singleton pattern and the. Learning design patterns was a pivotal point for my understanding development. The Factory pattern provides a creational way for creating objects. Design Patterns. If all the code lives in static methods, and you're not using getters/setters, it's almost certainly a poor design. The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies. Builder class builds the final object step by step. Design Pattern - Decorator; Design Pattern - Singleton; Web Development Cheat Sheet; Maven + Jetty 測試 JSF 2 Annotation; Design Pattern - Abstract Factory; Design Pattern - Factory; Maven Setup Jetty Development Server; Design Pattern - Observer; Design Pattern - Strategy. Could someone please explain the abstract factory design pattern in simple english. For instance, we could create the following abstract interface:. Data Access Object or DAO design pattern is a popular design pattern to implement persistence layer of Java application. A factory function is simply a function that returns an object. CodeWoot is the best resource for all your programming tutorials and code sample needs. used to create objects, similar to factory method design pattern which is also creational design pattern. Factory design pattern works like a factory in the real world in that it creates something for others to use. Gang of four (GOF) have categorized Design Patterns into 3. Factory method is a creational design pattern, i. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more. Factory method design pattern is one of the well-known “Gang of Four” (GoF) design patterns and it is a creational design pattern that uses factory methods to deal with creating instances without specifying the exact class of the object that will be created. Advantage of Factory Design Pattern. Get scripts and apply to your page. One of the most commonly used design patterns is the factory pattern. The basic intention of object oriented design - as opposed to procedural design - is that you distribute both data and behaviour to objects. js, so users do not need to use new. The client instructs the factory what type of employee to create by passing a type argument into the Factory Method. The createEmployee method is the actual Factory Method. The Builder design pattern uses the Factory Builder pattern to decide which concrete class to initiate in order to build the desired type of object, as we will see below in the UML diagram: The participants classes in this pattern are: The Builder class specifies an abstract interface for creating parts of a Product object. An application needs to create the elements of a complex aggregate. They help ensure that when one part of a … - Selection from Learning JavaScript Design Patterns [Book]. Gang of Four Design Patterns. caching immutable objects, easy to introduce new objects etc. On the other hand, an abstract factory pattern creates the object through composition and produce families of products. You will understand what each pattern is ,why we need it and then work on implementing it hands on. Now i am going to show extremely basic demo sample code for factory design pattern. What are design patterns? Why are they useful? What is the factory design pattern?. It provides an interface for creating parts of a product. At present, tutorials in this section cover the GOF/Gang of Four Design Patterns. It provides a way of wrapping a mix of public and private methods and variables, protecting pieces from leaking into the global scope and accidentally colliding with another developer's interface. Instead of embedding this code directly in the class which calls the algorithm, a better approach is to decouple this code into another class which implements Factory method. In this JavaScript example the Factory object creates four different types of employees. JavaScript Factory Pattern with Mixins in ES6 is one of the great pattern in JavaScript that can be used easily. There’s a lot of code out there that starts with jQuery. The creation of an object often requires complex processes not appropriate to include within a composing object. Design Patterns JavaScript Design Patterns: Strategy. Data & Object Factory helps developers succeed with Design Patterns and Pattern Architectures through training, products, and a. Factory Method Design Pattern. This person may know some info they need in the people they hire, but that’s it. Any other code that uses the factory will be updated automatically. Here I try to make them stick in to your mind (and maybe mine) by explaining them in the simplest way possible. The Gang of Four are the four authors of the book, "Design Patterns: Elements of Reusable Object-Oriented Software". Right, let's sew an Ellie! WE'LL START WITH THE EARS: STEP 1. Difficulty-Intermediate Java Concurrency. For example consider a USB to Ethernet adapter. Implementation. Java Design Pattern Interview Questions Part 1 These are set of Java Design pattern both core and J2EE questions which you could expect in an interview. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. Even though the coding examples will be in C++ as I am more comfortable with, they can be…. Factory Design Pattern Super Class. The Builder design pattern is in many ways a continuation of the Abstract Factory design pattern. The Factory Method design pattern can be applied to similar situations in programming where you have a set of component classes but won't know exactly which one you'll need to instantiate. A design pattern is a reusable software solution. …Factory Method lets a class defer…instantiation to subclasses. Here I try to make them stick in to your mind (and maybe mine) by explaining them in the simplest way possible. Factory Design Pattern has many different implementations and many extensions. js, so users do not need to use new. It basically deals with the issue of creating objects when the class that instantiates it needs to be dynamic. The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies. Better Unit Tests through Design Patterns: Repository, Adapter, Mocks, and more… Benjamin Day. It provides a way of wrapping a mix of public and private methods and variables, protecting pieces from leaking into the global scope and accidentally colliding with another developer's interface. I saw a tutorial about design pattern in javascript. We will learn, How to create objects from other objects in javascript. Another way of looking at patterns are as templates for how we solve problems - ones which can be used in quite a few different situations. Consider for example a game of war, were there is a large number of soldier objects; a soldier object maintain the graphical representation of a soldier, soldier behavior such as motion, and firing weapons, in addition soldier’s health and location on the war terrain. An Overview of JavaScript Design Patterns 1. So far we’ve covered the Simple Factory, which creates this functionality in a Singleton object, which is the _simplest _way of creating a Factory, hence its nomenclature (I love that word). Net technology I didn’t write about. What's the best approach for developing an application with JavaScript? This book helps you answer that question with numerous JavaScript coding patterns and best practices. This series is dedicated to the design patterns using JavaScript. link Key Concepts. Learn the Command Design Pattern with easy Java source code examples as James Sugrue continues his design patterns tutorial series, Design Patterns Uncovered. Programming tips, tools, and projects from our developer community. When creation of an object is complex or a subject to a change, a factory acts as a nice mediator. The factory pattern is one of the most widely used creational patterns. Design patterns are tested by others and are safe to follow, e. A design pattern is a solution to a general What Can You Do for Us That Other Top 16 design patterns interview questions and answers If you need top 7 free please visit: 4career. net azure best practices boxing c# career clean architecture Clean Code Community database data structures David Thomas ddd dedicated practice deliberate practice design design patterns devops domain driven design gadgets git interfaces javascript linq open-source podcast practice. Adapter Design Pattern Intent. They're time tested solutions to common problems in software design. In this course, I will show you tried and true design patterns to help structure and organize your code to make your JavaScript code more readable and maintainable. In their view, it's actually a variation of three classical design patterns: the Observer, Strategy and Composite patterns. used to create objects, similar to factory method design pattern which is also creational design pattern. Depending on how MVC has been implemented in a framework, it may also use the Factory and Template patterns. What is Template Method design pattern? What are the basic principles? How to implement and where we can use this. In their view, it's actually a variation of three classical design patterns: the Observer, Strategy and Composite patterns. Strategy with Factory Method design pattern. For example:. Exploring 20 different design patterns, this video course demonstrates the internal logic of each, while providing examples and real-world scenarios that developers can adopt and implement when programming in JavaScript, and solving a wide array of JavaScript programming problems. It is also commonly referred as Factory method and have few variations based on how the objects are getting created. Writing "bad" JavaScript is easy. Design patterns are discussed in detail in GoF book named "Design Patterns Elements of Reusable Object Oriented Software". If you want to keep your code efficient, more manageable,. The subclasses are responsible for creating concrete product objects; for factory method is possible adding new product classes without changing the abstract factory. An object is an iterator when it knows how to access items from a collection one at a time, while keeping track of its current position within that sequence. You will understand the Dependency Injection pattern, which is the main principle behind the decoupling process that Spring performs, thus making it easier to manage your code. You will understand what each pattern is ,why we need it and then work on implementing it hands on. This pattern handles the problem by defining a completely separate method for the creation of objects and which sub-classes are able to override so they can specify the ‘type’ of factory product that. I try to explain it in simple terms with focus on application. Factory pattern is one of the most used design patterns in Java. In this article, Xianzhong demonstrates the application of six popular design patterns from GoF in JavaScript. Often, factory functions are used as API wrappers, like in the cases of jQuery and moment. In a software design pattern view, lazy initialization is often used together with a factory method pattern. With no way to define classes in ECMAScript, developers created functions to encapsulate the creation of objects with specific interfaces, such as in this example:. The Repository Design Pattern, defined by Eric Evens in his Domain Driven Design book, is one of the most useful and most widely applicable design patterns ever invented. Composite pattern is a partitioning design pattern and describes a group of objects that is treated the same way as a single instance of the same type of object. This is typically not used at the framework level, and is only used by clients wishing to gain access to the presentation. This gives your. In this article, I would like to share what is strategy pattern and how is it work? What is Strategy Design pattern?. JavaScript-optimized patterns are available in our JavaScript + jQuery Design Pattern Framework, a unique guide for web app developers and architects. net • Free ebook: 75 interview questions and answers. Now, we can design a factory for our different kingdom factories. Let’s take a quick dive into some of the major Javascript design patterns. Table of Contents The Strategy pattern is one of my personal favorites and you've probably seen or used it in some fashion without even knowing it. It provides a way of wrapping a mix of public and private methods and variables, protecting pieces from leaking into the global scope and accidentally colliding with another developer's interface. widget and jQuery’s API, providing a more built-in. Both singleton and custom type patterns can be used as the base for your new factory. I have included some of the commonly used ones. In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface. He provides comprehensive coverage of the Singleton, Factory Method, Decorator, Observer, Facade, and Command patterns. The Factory Method defines a method for creating the objects, which subclasses can then override to specify the derived type that will be created. Abstract factory: Abstract factory pattern is used whenever we need another level of abstraction over a group of factories created using factory pattern. There are 23 classical design patterns described in the book Design Patterns: Elements of Reusable Object-Oriented Software. In this article, Xianzhong demonstrates the application of six popular design patterns from GoF in JavaScript. js There's a common design pattern in the Node. The Factory design pattern separates object creation from the rest of code. The idea is to use a static member-function (static factory. The Factory Method Pattern is also known as Virtual Constructor. The Factory method lets a class defer instantiation to subclasses". Some design patterns are built into Python, so we use them even without knowing. in JavaScript. We can implement dependency injection in java to move the dependency resolution from compile-time to runtime. Role The Visitor pattern defines and performs new operations on all the elements of an existing structure, without altering its classes. Lazy initialization (also called lazy function definition or lazy loading) is a creational design pattern which often boosts performance. As a perfect example, the "Factory" pattern is completely unnecessary in some languages, Ruby as the example I am thinking of (because object construction is just a method on the Class instance):. Architectural pattern on Wikipedia; Software design pattern on Wikipedia; Collection of implementation examples; Factory. If you told me at the time that I…medium. Mediator design pattern is used to provide the loose coupling or to reduce the interaction complexity between multiple objects. Learn the Command Design Pattern with easy Java source code examples as James Sugrue continues his design patterns tutorial series, Design Patterns Uncovered. It is not a finished design that can be transformed directly into source or machine code. See and hear andy's views on design and how it helps our clients. Object equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait. A collaborative learning platform for software developers. To Mom, and those who have listened, thanks —Dustin Diaz To Alec, Dymphi, and Terry —Ross Harmes. We need this when we have an Ethernet interface on one end and USB on the other. The functionality classes (PageObjects) in this design represent a logical relationship between the pages of the application. The OLOO pattern simplifies the predominant class-based design patterns (listed above and below) by creating objects directly from other objects, instead of using constructor. Creational Pattern. This is an implementation of the Abstract Factory pattern. The factory method pattern is used when we have group of classes and one class needs to be instantiated to represent the user data. The factory method design pattern exists in order to encapsulate an actual class instantiation. I have included some of the commonly used ones. Factory Design Pattern Super Class. In essence, you would want to use the Builder design pattern when you need to create a complex object in a step by step manner. Gang of four (GOF) have categorized Design Patterns into 3. The createEmployee method is the actual Factory Method. This means that you can always validate. A superclass defines an interface to create an object. The singleton is a design pattern in JavaScript which is used when we know we have only one object to be created of a specific type. The client instructs the factory what type of employee to create by passing a type argument into the Factory Method. Upcoming tutorials and articles will cover design areas such as Enterprise Integration Patterns, J2EE Core Design Patterns, Anti-patterns, and design refactoring. Strategy vs. Sample code in JavaScript. js is generated by default. That means the code interacts solely with the. Both singleton and custom type patterns can be used as the base for your new factory. Spin up Pattern Lab loaded with frameworks like Bootstrap, Foundation, or Material Design. The original "Gang of Four" design patterns book described two more variations of the factory pattern: Factory Method and Abstract Factory. Discover the modern implementation of design patterns in JavaScript. Its primary purpose is to help you. Convert the interface of a class into another interface clients expect. We will learn, How to create objects from other objects in javascript. The new observers can be added directly in the. The beginner section will help to get insight into software design principles and software Design patterns along with Gang of four design patterns. Strategy vs. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. Clicking anywhere other than inside #innerContainer will hide the original hidden div and remove the document-wide event handler. Design patterns are used to represent some of the best practices adapted by experienced object-oriented software developers. By this way, the factory break the tight coupling between source of data and process of data. JavaScript patterns and antipatterns collection. Selenium Page Factory Pattern is like an extension to Page Object Model , but Page Factory is much enhanced model. In my previous post I introduced what I call “function spaghetti code” and explained some of the problems it introduces. Several other patterns, such as, Factory, Prototype, and Façade are frequently implemented as Singletons when only one instance is needed. Factory Design Pattern has many different implementations and many extensions. External resources and inspiration:. It is also commonly referred as Factory method and have few variations based on how the objects are getting created. A Factory is simply an object that creates other objects. This gives your. Factory Method Design Pattern. Learning design patterns was a pivotal point for my understanding development. If a page in the AUT has multiple components, it may improve maintainability if there is a separate page object for each component. Factory Method: The Factory Method Pattern defines an interface for creating an object, but lets subclasses decide which. For some reason it's being left behind in any design pattern usage in JavaScript. Small screen design patterns Guides to effective component design patterns that work on small screen apps, including Firefox OS. Factory Pattern. JavaScript Design Patterns: Decorator 2012/01/13 Today I’d like to show another JavaScript Design Pattern: the Decorator, which is a way to add features to objects without subclassing or adding extra attributes. The factory design pattern is really a way of delaying the implementation of multiple seams until you know what to hand the calling thread of execution. It describes the problem. Today we feature the Factory pattern. Object equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait. It also helps a lot with organizing your code, because: Isolates the objects that need to be created. A discussion of the general concept of factories and the two design patterns: Factory Method and Abstract Factory. Decorator Design Pattern in Java. This folders are the different steps to. It cannot be transformed directly into the source code as a finished design since it is more of a template that can be used in many different situations. The beginner section will help to get insight into software design principles and software Design patterns along with Gang of four design patterns. Consider the following example of the factory pattern:. The Factory pattern is one of the fundamental creational patterns along side the Singleton pattern which we talked about before. Factory and Abstract factory Introduction Hi friends, Please do not think you get an architecture position by reading interview questions. I am trying to understand the factory design pattern and how it can be implemented in Javascript. In this video I show you how a Factory pattern could work in Javascript. The 23 Gang of Four. The Factory Method design pattern is one of the "Gang of Four" design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse. It provides a way of wrapping a mix of public and private methods and variables, protecting pieces from leaking into the global scope and accidentally colliding with another developer's interface.