design pattern in object-oriented software development
Factsheet
Name Singleton
Name Singleton
Wikipedia
en.wikipedia.org › wiki › Singleton_pattern
Singleton pattern - Wikipedia
October 17, 2025 - In object-oriented programming, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. It is one of the well-known "Gang of Four" design patterns, which describe how to solve recurring problems in object-oriented software.
Refactoring.Guru
refactoring.guru › home › design patterns › creational patterns
Singleton
January 1, 2026 - Singleton is a creational design pattern that lets you ensure that a class has only one instance, while providing a global access point to this instance.
language agnostic - Purpose of singletons in programming - Stack Overflow
This is, admittedly, a rather loose question. My current understanding of singletons is that they are a class/type that you define such that only one instance is ever created. This sounds a lot lik... More on stackoverflow.com
What, when why Singleton design pattern?
The main point of singletons isn't resources but domain modelling. If your class represents something, like a log file, that you only have one of, it should be a singleton. If not, it shouldn't. That doesn't mean it has to be implemented in a certain way, just that you should only have one instance of it. More on reddit.com
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September 12, 2019Singleton Design Pattern: Managing Global States in Your Applications
class Singleton Sigh.. Just export a plain object. More on reddit.com
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November 10, 2024Singleton where to avoid living
Singleton is a great town the best fishing is in the creeks like glennies or heading towards gresford way. Lake stClair is also great fishing camping and swimming, The o key parts to avoid is Buchan ave area and wakehurst crescent up the heights. Singleton is a very rich town with all of the miners and contractors to the mines Making huge coin (six figures easy) this make rentals hard to get and expensive. Singleton has 9 pubs 2 RSL’s a bowls club a golf club so the night life is quite good Plenary of shops and supermarkets ect. More on reddit.com
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November 7, 2022Videos
01:10
Singleton Pattern Explained in 60 SECONDS! #programming - YouTube
04:18
Unity Design Pattern - SINGLETON - YouTube
10:16
What is the Singleton Pattern? (Software Design Patterns) - YouTube
09:57
Singleton Pattern EXPLAINED IN 10 MINS | Javascript Design Patterns ...
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The Problem With Singletons You Need to Avoid - YouTube
15:31
The Real Reason the Singleton Pattern Exists - YouTube
Game Programming Patterns
gameprogrammingpatterns.com › singleton.html
Singleton · Design Patterns Revisited · Game Programming Patterns
When much of the industry moved to object-oriented programming from C, one problem they ran into was “how do I get an instance?” They had some method they wanted to call but didn’t have an instance of the object that provides that method in hand. Singletons (in other words, making it ...
Yahoo!
sports.yahoo.com › articles › broncos-fans-werent-thrilled-team-220753903.html
Broncos fans weren't thrilled about team re-signing Alex Singleton - Yahoo Sports
1 week ago - One of the moves Denver made on Monday was bring back linebacker Alex Singleton to a two-year deal worth $15.5 million. Singleton led the Broncos in total tackles in 2025, despite being diagnosed with testicular cancer in the middle of the season.
Rieck
bastian.rieck.me › blog › 2014 › brief_critique_singleton
A brief critique of the singleton pattern
August 24, 2014 - As a preparation for an upcoming workshop on design patterns, I revisited some of the more common design patterns. The most infamous one is probably the “singleton pattern”. Lauded by some, called an ugly mask for global variables by others, it certainly seems to divide the community.
Ardalis
ardalis.com › the-singleton-design-pattern
The Singleton Design Pattern - Ardalis (Steve Smith)
June 17, 2020 - The Singleton Design Pattern is a fairly simple creational pattern used to ensure that there is only ever a single instance of a class in an object-oriented language.
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The main advantage of a singleton over a class consisting of statics is that you can later easily decide that you need in fact more than one instance, e.g. one per thread.
However, in practice the main purpose of singletons is to make people feel less bad about having global variables.
A practical example for a good use of a singleton: you have an app that uses an SQL database and you need a connection pool. The purpose of such a pool is to reuse DB connection, so you definitely want all clients to use the same pool. Thus, having it as a singleton is the correct design. But one day you need the app to connect to a second DB server, and realize that you cannot have connections to different servers in the same pool. Thus your "one instance overall" singleton becomes "one instance per DB server".
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why you would wan't to
I wouldn't because singletons usually are a bad way to solve your problems. My recommendation to you is to avoid them completely.
The main reasons are:
- Singletons mostly represent global state (which is evil).
- Correct dependency injection becomes impossible.
I suggest you read the rest (including thorough explanations) in this Google employee's blog:
- Singletons are Pathological Liars
- Where Have All the Singletons Gone?
- Root Cause of Singletons
- Flaw: Brittle Global State & Singletons
Walmart
walmart.com › ip › Singleton-Paperback-9781933846767 › 568534226
Singleton (Rústica) - Walmart.com
Singleton (Rústica)
Singleton no era un hombre simple; simplemente tenía necesidades simples, y hablaba de ellas simplemente. Transportó carga a través de los Estados Unidos, y su vida era lo que muchos clasificarían como la de un vagabundo. Pero Singleton eligió el camino. Eligió los interminables destinos de transporte y vacíos. No porque huyera de una vida estable y constante, sino porque estaba trabajando. Y trabajar era todo lo que sabía. Al igual que Hemingway y Steinbeck, · Cady escribió sobre la condición del trabajador estadounidense. Singleton es a la vez una memoria y una meditación en el camino abiert
Price $17.99
Reddit
reddit.com › r/csharp › what, when why singleton design pattern?
r/csharp on Reddit: What, when why Singleton design pattern?
September 12, 2019 -
I am reading about Singleton design pattern and I don't understand why we should use it, a lot of people will say, oh to create a single instance of that class in order to save resources, and it's fine I get it, then we should use it for every class? Because from my understating we use it only on classes that their data not change, se they upload it one time in the memory and share them across the code, am I right? At this point will be useless to instantiate multiple objects which return the same unchangeable data? Right?
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I develop software for medical devices: robotic diagnostics and robotic surgery systems. In these systems, we use Singleton design patterns in our hardware drivers, to ensure a hardware or electrical system is associated only with a single object in software, to prevent the components from receiving conflicting instructions, or from the software storing conflicting state information.
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The main point of singletons isn't resources but domain modelling. If your class represents something, like a log file, that you only have one of, it should be a singleton. If not, it shouldn't. That doesn't mean it has to be implemented in a certain way, just that you should only have one instance of it.
Wikipedia
en.wikipedia.org › wiki › Singleton
Singleton - Wikipedia
August 2, 2025 - Singleton (global governance), a hypothetical world order with a single decision-making agency
Patterns.dev
patterns.dev › vanilla › singleton-pattern
Singleton Pattern
Restricting the instantiation to just one instance could potentially save a lot of memory space. Instead of having to set up memory for a new instance each time, we only have to set up memory for that one instance, which is referenced throughout the application. However, Singletons are actually considered an anti-pattern, and can (or..
Reddit
reddit.com › r/javascript › singleton design pattern: managing global states in your applications
r/javascript on Reddit: Singleton Design Pattern: Managing Global States in Your Applications
November 10, 2024 - Zustand answers this by requiring crazy mocks that reset a store's internal state between tests, because, used in the suggested fashion, you can't conjure-up a new singleton instance of a store because it is bound to a module.
NDepend
blog.ndepend.com › home › what the singleton pattern costs you
Understanding What the Singleton Pattern Costs You
August 1, 2025 - So let’s consider implications and usage. When you use this pattern, you define an object that will exist across all application scope and that you can easily access from anywhere in the code at any time. A logger is, perhaps, the most iconic example of a singleton use case.
Medium
medium.com › star-gazers › what-is-singleton-pattern-and-what-is-the-advantage-of-it-43f09509aa7f
What is Singleton pattern and what is the advantage of it. | by Verdiyev Mahammad | Star Gazers | Medium
October 25, 2020 - Singleton is a creational pattern.
406mtsports
406mtsports.com › college › big-sky-conference › montana-state-university › broncos-re-sign-former-bobcat-alex-singleton-falcons-restructure-troy-andersens-contract › article_f3b3eab1-a523-4c9c-b1ce-de1dbd8a7953.html
Broncos re-sign former Bobcat Alex Singleton, Falcons restructure Troy Andersen's contract
Former Bobcat Alex Singleton shared his cancer diagnosis, Caden Dowler was named player of the week, and Justin Lamson and Brent Vigen preview…
Published 1 week ago
Malts
malts.com › en-us › the-singleton
The Singleton Whisky | Exceptional Single Malt Scotch | Malts US - Malts
At The Singleton, we believe that life is richer when you slow things down. At our 3 award-winning distilleries in the Scottish Highlands, we use slow batch distillation to create richer, smoother single malts loved by newcomers and connoisseurs alike.
Apple Developer
developer.apple.com › documentation › swift › managing-a-shared-resource-using-a-singleton
Managing a Shared Resource Using a Singleton | Apple Developer Documentation
Provide access to a shared resource using a single, shared class instance.
SourceMaking
sourcemaking.com › design_patterns › singleton
Singleton Design Pattern
The Singleton pattern ensures that a class has only one instance and provides a global point of access to that instance. It is named after the singleton set, which is defined to be a set containing one element.
Diageo
diageo.com › home › our brands › scotch whisky › the singleton
The Singleton | Diageo
The Singleton, an award-winning Single Malt Scotch Whisky, emerges from three Highland distilleries: Glen Ord, Glendullan, and Dufftown.
AlgoMaster
algomaster.io › learn › lld › singleton
Singleton | LLD | AlgoMaster.io
3 weeks ago - Global variables in languages that support them have similar accessibility but no initialization control. A Singleton can control when and how the instance is created, perform lazy initialization, enforce thread safety during construction, and validate that only one instance ever exists.