--- title: Javascript Design Patterns | daily.dev description: Singleton design pattern exposes a single instance that can be used by multiple components. Singleton Pattern can be considered the basics of global state... canonical: https://daily.dev/posts/javascript-design-patterns-z7nr1izeg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Javascript Design Patterns | daily.dev og:description: Singleton design pattern exposes a single instance that can be used by multiple components. Singleton Pattern can be considered the basics of global state... og:url: https://daily.dev/posts/javascript-design-patterns-z7nr1izeg og:image: https://api.daily.dev/og/posts/z7nr1iZEg.png og:image:alt: Javascript Design Patterns og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Javascript Design Patterns **[gitconnected](https://daily.dev/sources/gc)** · 5 min read · 225 upvotes · 4 comments ## Summary Singleton design pattern exposes a single instance that can be used by multiple components. Singleton Pattern can be considered the basics of global state management libraries such as Redux or React Context. The factory pattern is preferred in cases where the object creation process depends on dynamic factors. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@arshad167** · 0 upvotes > good one **@anubhavbhatt** · 0 upvotes > good one explanation **@waroi** · 0 upvotes > 👍 **@danoph** · 0 upvotes > Another use for factories is with unit testing. I create factories for objects that have the same shape as data coming from a database. When combined with a library like faker you can simulate realistic data without having to create records in a database and delete them before and after each test run. ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 1 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments - [CNCF Unveils Schedule for KubeCon \+ CloudNativeCon Europe 2026](https://daily.dev/posts/cncf-unveils-schedule-for-kubecon-cloudnativecon-europe-2026-ikhcoa5cb) · CNCF · 2 upvotes · 0 comments - [CNCF Debuts KubeCon \+ CloudNativeCon Japan 2026 Schedule](https://daily.dev/posts/cncf-debuts-kubecon-cloudnativecon-japan-2026-schedule-xp5pyudub) · CNCF · 1 upvotes · 0 comments --- Tags: [#react](https://daily.dev/tags/react), [#webdev](https://daily.dev/tags/webdev), [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/javascript-design-patterns-z7nr1izeg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Javascript Design Patterns","url":"https://daily.dev/posts/javascript-design-patterns-z7nr1izeg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/javascript-design-patterns-z7nr1izeg"},"datePublished":"2022-11-19T17:23:24.277Z","dateModified":"2022-11-19T17:23:24.276Z","description":"Singleton design pattern exposes a single instance that can be used by multiple components. 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I create factories for objects that have the same shape as data coming from a database. When combined with a library like faker you can simulate realistic data without having to create records in a database and delete them before and after each test run.","datePublished":"2023-03-14T18:47:41.133Z","url":"https://daily.dev/posts/z7nr1iZEg#c-YoWzAyFWc","author":{"@type":"Person","name":"Daniel Errante","url":"https://daily.dev/danoph","image":"https://avatars.githubusercontent.com/u/10590?v=4"}}]} ```