--- title: JavaScript Visualized | daily.dev description: This post explores the inner workings of promises in JavaScript, including the creation of promises using the `new Promise` constructor, the purpose of the... canonical: https://daily.dev/posts/aszcpn8z7 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: JavaScript Visualized | daily.dev og:description: This post explores the inner workings of promises in JavaScript, including the creation of promises using the `new Promise` constructor, the purpose of the... og:url: https://daily.dev/posts/aszcpn8z7 og:image: https://api.daily.dev/og/posts/AszCpn8Z7.png og:image:alt: Post cover image 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 Visualized **[DevDojo](https://daily.dev/sources/thedevdojo)** · [@bobbyiliev](https://daily.dev/bobbyiliev) · 321 upvotes · 4 comments ## Summary This post explores the inner workings of promises in JavaScript, including the creation of promises using the `new Promise` constructor, the purpose of the Promise Reaction record, and how promises can be used to handle asynchronous tasks in a non-blocking way. ## 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. **@alexitaylor** · 1 upvotes > Top quality article!! 💯 **@bhatzeeshan** · 1 upvotes > Nice one **@kawsarkabir** · 0 upvotes > Wow, this breakdown makes Promises so much clearer! I really liked how you connected the internal slots like [[PromiseState]] and [[PromiseResult]] with the event loop and microtask queue — it helped me visualize what’s actually happening under the hood. The step-by-step example with setTimeout and the chaining explanation was super practical too. Thanks for updating this topic and making such a tricky concept so approachable ## 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: [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/aszcpn8z7) ```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":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/aszcpn8z7","headline":"JavaScript Visualized","text":"Shared: JavaScript Visualized","url":"https://daily.dev/posts/aszcpn8z7","datePublished":"2025-06-06T21:25:40.292Z","dateModified":"2025-06-06T21:25:40.295Z","author":{"@type":"Person","name":"Bobby Iliev","url":"https://daily.dev/bobbyiliev","image":"https://avatars3.githubusercontent.com/u/21223421?v=4","description":"DevOps, DevEx, cloud & open source\n","worksFor":{"@type":"Organization","name":"Materialize","logo":"https://res.cloudinary.com/daily-now/image/upload/s--4mL2CrlK--/f_auto/v1725263959/companies/materialize"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":78910}},"image":"https://media.daily.dev/image/upload/s--CxzD6vbw--/f_auto/v1722860399/public/Placeholder%2005","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":321},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":4}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/Jf60GLU2W"},"comment":[{"@type":"Comment","text":"Top quality article!! 💯","datePublished":"2025-06-13T19:21:54.606Z","url":"https://daily.dev/posts/AszCpn8Z7#c-NAYJuc1rK","author":{"@type":"Person","name":"Alexi Taylor","url":"https://daily.dev/alexitaylor","image":"https://lh3.googleusercontent.com/a-/AAuE7mD9HNQYyxW59QdHSM9PVjrTUCeJf_uk6pwisBu0Ew=s100"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"Nice one","datePublished":"2025-08-19T09:32:06.775Z","url":"https://daily.dev/posts/AszCpn8Z7#c-0hG2pmbxb","author":{"@type":"Person","name":"Bhat Zeeshan","url":"https://daily.dev/bhatzeeshan","image":"https://lh3.googleusercontent.com/a/ACg8ocKb9LQQygse0lJANuvYVPSnDoaQVPnm0emhAf1Gru6oon42-WvH=s96-c"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"Wow, this breakdown makes Promises so much clearer! I really liked how you connected the internal slots like [[PromiseState]] and [[PromiseResult]] with the event loop and microtask queue — it helped me visualize what’s actually happening under the hood. The step-by-step example with setTimeout and the chaining explanation was super practical too. 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