{"id":9362,"date":"2022-09-18T14:31:51","date_gmt":"2022-09-18T09:01:51","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-singleton-is-design-pattern-or-anti-pattern-closed\/"},"modified":"2022-09-18T14:31:51","modified_gmt":"2022-09-18T09:01:51","slug":"solved-singleton-is-design-pattern-or-anti-pattern-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-singleton-is-design-pattern-or-anti-pattern-closed\/","title":{"rendered":"[Solved] singleton is design-pattern or anti-pattern? [closed]"},"content":{"rendered":"

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As far as I know, the book AntiPatterns<\/em> by Brown et al, 1998 may have been the first to popularise the term. It defines an anti-pattern like this:<\/p>\n

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“An AntiPattern is a literary form that describes a commonly occurring solution to a problem that generates decidedly negative consequences.”<\/p>\n<\/blockquote>\n

I think that it’s worthwhile to pay attention to the phrase decidedly negative consequences<\/em>. Most solutions come with some disadvantages, but in order for a ‘solution’ to be an anti-pattern, the disadvantages must clearly outweigh any advantages produced.<\/p>\n

I usually look at it another way<\/a>. If I can solve the problem in a different way that generates at least as many advantages, but fewer disadvantages, then the first ‘solution’ might be an anti-pattern.<\/p>\n

As described in the GoF book, the Singleton design pattern addresses a particular problem: Sometimes you want to ensure that only one instance of a class can exist.<\/p>\n

This can be appropriate for performance reasons. If the object holds a large amount of data, making sure that only one exists could improve performance.<\/p>\n

Even if the object doesn’t hold a large amount of memory, you may want to make a small immutable object a Singleton if you otherwise expect that client code might instantiate millions of identical objects.<\/p>\n

Particularly when the Singleton object represents immutable data it’s hard to argue that it has decidedly negative consequences. It’s basically just a constant, like string.Empty<\/code>. The Singleton pattern is a good solution to that kind of problem.<\/p>\n

On the other hand, many people use mutable<\/em> Singletons as a replacement for techniques like Dependency Injection or partial function application. When used in this way, a Singleton becomes a global variable<\/strong>, which most people nowadays agree should be avoided.<\/p>\n

Since Singleton has valid uses, I don’t think it can be called an anti-pattern. On the other hand, I’d consider a mutable<\/em> Singleton a code smell bordering on anti-pattern.<\/p>\n<\/p><\/div>\n

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solved singleton is design-pattern or anti-pattern? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"

[ad_1] As far as I know, the book AntiPatterns by Brown et al, 1998 may have been the first to popularise the term. It defines an anti-pattern like this: “An AntiPattern is a literary form that describes a commonly occurring solution to a problem that generates decidedly negative consequences.” I think that it’s worthwhile to … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2639,1011,2638],"class_list":["post-9362","post","type-post","status-publish","format-standard","hentry","category-solved","tag-anti-patterns","tag-design-patterns","tag-singleton"],"yoast_head":"\n[Solved] singleton is design-pattern or anti-pattern? [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-singleton-is-design-pattern-or-anti-pattern-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] singleton is design-pattern or anti-pattern? [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] As far as I know, the book AntiPatterns by Brown et al, 1998 may have been the first to popularise the term. It defines an anti-pattern like this: “An AntiPattern is a literary form that describes a commonly occurring solution to a problem that generates decidedly negative consequences.” I think that it’s worthwhile to ... 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