A design pattern is a general reusable solution to a commonly occurring problem in software design.

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Is loose coupling w/o use cases an anti-pattern?

Loose coupling is, to some developers, the holy grail of well-engineered software. It's certainly a good thing when it makes code more flexible in the face of changes that are likely to occur in the ...
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What are the drawbacks to the ActiveRecord pattern?

I'm curious what are the drawbacks to using the ActiveRecord pattern for data access/business objects. The only one I can think of off the top of my head is that it violates the Single Responsibility ...
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Mediator vs Observer?

Can someone provide me with a canonical answer on the differences between an Observer and a Mediator, and a summary of when you should use one pattern over the other? I am unsure of what kind of ...
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Map of functions vs switch statement

I'm working on a project that processes requests, and there are two components to the request: the command and the parameters. The handler for each command is very simple (< 10 lines, often < ...
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success:/failure: blocks vs completion: block

I see two common patterns for blocks in Objective-C. One is a pair of success:/failure: blocks, the other is a single completion: block. For example, lets say I have a task that will return an object ...
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How to design website workflow?

I have been thinking about this for really long time without reaching an optimum answer. First of all, I'm a medical doctor who loves programming but never really studied it, except for home learning ...
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Web Developer interview questions [closed]

I read an article today that listed some basic questions about web development: Describe how POST data was submitted to a server by a browser. Explain a number of HTTP status codes (except maybe 404 ...
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Interfaces on an abstract class

My coworker and I have different opinions on the relationship between base classes and interfaces. I'm of the belief that a class should not implement an interface unless that class can be used when ...
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Do enums create brittle interfaces?

Consider the example below. Any change to the ColorChoice enum affects all IWindowColor subclasses. Do enums tend to cause brittle interfaces? Is there something better than an enum to allow for ...
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Is Dependency Injection worth it outside of UnitTesting

Given a constructor that will never, ever, have to use any different implementations of several objects that it initializes, is it still practical to use DI? After all, we might still want to unit ...
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Why is MVC more popular than PAC? [closed]

I just stumbled upon a question at SO about PAC and got interested in the pattern. I'm wondering why it's not as widely used as MVC? What is the MVC benefits compared to PAC?
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GoF Design Patterns - which ones do you actually use? [closed]

I'm trying to educate my colleagues in the area of design patterns. Some of the original Gang of Four patterns are a little esoteric, so I'm wondering if there is a sub-group of "essential" patterns ...
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Strategies for avoiding SQL in your Controllers… or how many methods should I have in my Models?

So a situation I run into reasonably often is one where my models start to either: Grow into monsters with tons and tons of methods OR Allow you to pass pieces of SQL to them, so that they are ...
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Newbie question about Decorator design pattern

I was reading a programming article and it mentioned the Decorator pattern. I've been programming for awhile but without any kind of formal education or training, but I'm trying to learn about the ...
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How to store prices that have effective dates?

I have a list of products. Each of them is offered by N providers. Each providers quotes us a price for a specific date. That price is effective until that provider decides to set a new price. In ...
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Static factory vs factory as a singleton

In some of my code, I have a static factory similar to this: public class SomeFactory { // Static class private SomeFactory() {...} public static Foo createFoo() {...} public ...
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Is there a specific design strategy that can be applied to solve most chicken-and-egg problems while using immutable objects?

Coming from a OOP background (Java), I'm learning Scala on my own. While I can readily see the advantages of using immutable objects individually, I'm having a hard time seeing how one can design a ...
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Does the state Pattern violate Liskov Substitution Principle?

This image is taken from Applying Domain-Driven Design and Patterns: With Examples in C# and .NET This is the class diagram for the State Pattern where a SalesOrder can have different states during ...
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Relationship between Repository and Unit of Work

I am going to implement a repository, and I would like to use the UOW pattern since the consumer of the repository could do several operations, and I want to commit them at once. After read several ...
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When to use prototypical programming in JavaScript

I've spent a good bit of time developing simple widgets for projects in the following way: var project = project || {}; (function() { project.elements = { prop1: val1, prop2: val2 } ...
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What are DRY, KISS, SOLID, etc. classified as?

Is something like DRY a design pattern, a methodology, or something in between? They do not have specific implementations that could neccessarily be demonstrated(even if you can easily demonstrate a ...
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Is this pattern bad? [duplicate]

I notice that when I code I often use a pattern that calls a class method and that method will call a number of private functions in the same class to do the work. The private functions do one thing ...
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If Else - Repeated Code Logic

My boss gave me a project with a particular logic. I have to develop a web page which has to lead the navigator through many cases until he/she arrives at the product. This is the path scheme of the ...
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Does anyone have a specific example of using the Flyweight Pattern?

I have been studying design patterns and came accross the fly weight pattern. I have been trying to see opportunities to use the pattern in my applications but I am having trouble seeing how to use ...
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How to determine if a class meets the single responsibility principle?

The Single Responsibility Principle is based on the high cohesion principle. The difference between the two is that a highly cohesive classes features a set of responsibilities that are strongly ...
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DDD - Does an aggregate root's repository handle saving aggregates?

I am using a DDD-like approach for a greenfield module of an existing application; it's not 100% DDD due to architecture but I'm trying to use some DDD concepts. I have a bounded context (I think ...
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Equivalent of SOLID principles for functional programming

I've found the SOLID principles quite useful when thinking about object-oriented design. Is there a similar / equivalent set of language-agnostic principles tailored for functional programming?
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Is “Analysis Patterns: Reusable Object Models” Still A Good Book To Use For Its Subject Matter Today? [closed]

Is "Analysis Patterns: Reusable Object Models" by Martin Fowler (published 1996) still a good book to use for the content it covers? Are there other good books that cover the same content? Are there ...
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What if I will not use Software Design Patterns? [closed]

What kind of problems may I face, if I won't use Software Design Patterns? Can you tell me about the problems of approaching the design using standard object-oriented techniques?
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Is logging next to an implementation a SRP violation?

When thinking of agile software development and all the principles (SRP, OCP, ...) I ask myself how to treat logging. Is logging next to an implementation a SRP violation? I would say yes because ...
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Are too many if-else statements for validation bad? [duplicate]

From the book Professional Enterprise .Net, which has 5 star rating on Amazon that I am doubting after having a read through. Here is a Borrower class (In C# but it's pretty basic; anyone can ...
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Where is the M in MVC?

I'm trying to refactor my application into MVC, but I'm stuck on the M part. In a database-backed app, the model is implemented in the app code, right? But then, what is in the database -- is that ...
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How can I explain the usefulness of Inheritance? [closed]

When trying to explain the concept of Inheritance in OOP, the common example is often the mammals example. IMHO, this is really a bad example, because it will lead the newbies to use this concept the ...
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Is it possible to loosely couple an application to its framework?

Let's say I'm developing a web application. My first choice is to use PHP with Fat-Free Framework (F3) and MVC pattern. Next year, I might decide I want to switch to Zend Framework, or maybe even ...
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Is the GoF book still the one to read? [duplicate]

Possible Duplicate: Is there a canonical book on design patterns? I'd like to read a design patterns book. GoF for sure is the one to read. But after 15 years is it still valid, I mean ...
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When should complexity be removed?

Prematurely introducing complexity by implementing design patterns before they are needed is not good practice. But if you follow all (or even most of) the SOLID principles and use common design ...
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What is a 'good number' of exceptions to implement for my library?

I've always wondered how many different exception classes I should implement and throw for various pieces of my software. My particular development is usually C++/C#/Java related, but I believe this ...
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What are the main practices and design patterns every .NET guy should know? [closed]

In my brief time as a professional programmer I've seen lots of applications written by programmers who's entire education appears to have been reading the first couple of chapters in a .NET 2.0 book. ...
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Proper Model-View-_____ design

I've been reading up about Model View Controller, Model View Presenter, Model View ViewModel, and so on, and generally, the underlying concept seems pretty simple to understand: keep the pretty ...
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How can you tell whether to use Composite Pattern or a Tree Structure, or a third implementation?

I have two client types, an "Observer"-type and a "Subject"-type. They're both associated with a hierarchy of groups. The Observer will receive (calendar) data from the groups it is associated with ...
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Does MVC apply only to web

It is almost and instantaneous whenever I talk to developers about Model View Controller (MVC) they say you make a request to a url the server builds a entity (MODEL) and provides you with visual ...
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Is there a pattern for a more “natural” way of adding items to collections? [closed]

I think the most common way of adding something to a collection is to use some kind of Add method that a collection provides: class Item {} var items = new List<Item>(); items.Add(new ...
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How to avoid “managers” in my code

I'm currently re-designing my Entity System, for C++, and I have a lot of Managers. In my design, I have these classes, in order to tie my library together. I've heard a lot of bad things when it ...
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What is pattern based programming?

Can somebody explain the obsession with patterns and anti-patterns in programming? I ask because I have absolutely no idea what any of the patterns mean. When faced with a programming task I think ...
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Does the Decorator Pattern exist in the Java IO classes?

For an assignment, I have to find out which of the Gang of Four design pattern the classes java.io.Reader and its subclasses java.io.PushbackReader, java.io.BufferedReader and java.io.FilterReader ...
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Does Liskov Substitution Principle also apply to classes implementing an interface?

LSP states that classes should be substitutable for their base classes, meaning that derived and base classes should be semantically equivalent. But does LSP also apply to classes implementing an ...
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How do I set up MVP for a Winforms solution?

I have used MVP and MVC in the past, and I prefer MVP as it controls the flow of execution so much better in my opinion. I have created my infrastructure (datastore/repository classes) and use them ...
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Best overview to modern C++ paradigms? [closed]

I used to write C++ extensively between 8 and 10 years ago. I have since moved on to C# for professional reasons. However, from time to time I see statements like "If you're still manually ...
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How to make an ASP.NET MVC site modular

I'm in the planning stage for an employee intranet system to be built with ASP.NET MVC 4. We'd like the site to consist of separate "modules", each of which provides a different feature: messaging, ...
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Should universities put more emphasis on teaching their students about design patterns? [closed]

While I've heard about design patterns being mentioned in a few courses at uni, I know of only a single course which actually teaches design patterns. In almost all other areas (algorithms, ...