--- title: JavaScript Best Practices 2024 | daily.dev description: JavaScript continues to evolve, and staying up-to-date with the latest best practices is crucial for developers. Key practices include aligning with... canonical: https://daily.dev/posts/javascript-best-practices-2024-7ryt1mxlw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: JavaScript Best Practices 2024 | daily.dev og:description: JavaScript continues to evolve, and staying up-to-date with the latest best practices is crucial for developers. Key practices include aligning with... og:url: https://daily.dev/posts/javascript-best-practices-2024-7ryt1mxlw og:image: https://api.daily.dev/og/posts/7rYt1mxlW.png og:image:alt: JavaScript Best Practices 2024 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 Best Practices 2024 **[JetBrains](https://daily.dev/sources/jetbrains)** · 24 min read · 3516 upvotes · 122 comments ## Summary JavaScript continues to evolve, and staying up-to-date with the latest best practices is crucial for developers. Key practices include aligning with project-defined rules, using 'let' and 'const' instead of 'var' for variable declarations, leveraging classes over function prototypes, and implementing private class fields with '#'. Arrow functions are recommended for better syntax and context binding, while the nullish coalescing (??) and optional chaining (?.) operators improve code readability and reliability. Modern methods like 'Object.entries()', async/await syntax, and the 'Intl' API are also important for efficient and maintainable code. Additionally, using tools for precise calculations, handling JSON with big integers carefully, and employing robust testing practices are essential for developing high-quality JavaScript projects. ## 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. **@thangws24** · 13 upvotes > would definitely try to master these practices in my side projects **@wolfram74** · 13 upvotes > Overall really good article! > Just two thoughts: > Using callbacks (.then) or await: stick to one, mixing creates headaches. (Personally I like callbacks more.) > "Common practices" 1: use strict (===) > "Common practices" 2: 'if (name != null) { // Explicitly checking for null or undefined' ;P **@xiaoyu888** · 12 upvotes > cool **@stefanjudis** · 11 upvotes > Is it just me or is this post missing syntax highlighting? > >  **@paolalola** · 9 upvotes > looking forward for best practices 2025 ;) ## 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: [#webdev](https://daily.dev/tags/webdev), [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/javascript-best-practices-2024-7ryt1mxlw) ```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 Best Practices 2024","url":"https://daily.dev/posts/javascript-best-practices-2024-7ryt1mxlw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/javascript-best-practices-2024-7ryt1mxlw"},"datePublished":"2024-10-28T13:14:26.196Z","dateModified":"2024-12-12T09:04:23.040Z","description":"JavaScript continues to evolve, and staying up-to-date with the latest best practices is crucial for developers. 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(Personally I like callbacks more.)\n“Common practices” 1: use strict (===)\n“Common practices” 2: ‘if (name != null) { // Explicitly checking for null or undefined’ ;P","datePublished":"2024-10-29T14:06:10.164Z","url":"https://daily.dev/posts/7rYt1mxlW#c-6s1fzYPIo","author":{"@type":"Person","name":"Wolfram","url":"https://daily.dev/wolfram74","image":"https://media.daily.dev/image/upload/s--O0TOmw4y--/f_auto/v1715772965/public/noProfile"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":13}},{"@type":"Comment","text":"cool","datePublished":"2024-10-29T06:36:45.449Z","url":"https://daily.dev/posts/7rYt1mxlW#c-GuRKdl7tq","author":{"@type":"Person","name":"xiaoyu","url":"https://daily.dev/xiaoyu888","image":"https://media.daily.dev/image/upload/s--DlUK8bCH--/f_auto/v1730081423/avatars/avatar_9zsNylkNWIepqlNYmNdUR"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":12}},{"@type":"Comment","text":"Is it just me or is this post missing syntax highlighting?","datePublished":"2024-10-30T07:08:58.880Z","url":"https://daily.dev/posts/7rYt1mxlW#c-wKra3eq9z","author":{"@type":"Person","name":"Stefan Judis","url":"https://daily.dev/stefanjudis","image":"https://media.daily.dev/image/upload/s--r7SXleYc--/f_auto/v1730570556/avatars/avatar_PmEo6iUdc6wpgnZDWjBdx"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":11}},{"@type":"Comment","text":"looking forward for best practices 2025 ;)","datePublished":"2024-10-29T11:29:32.074Z","url":"https://daily.dev/posts/7rYt1mxlW#c-AGjfMC0YD","author":{"@type":"Person","name":"lola","url":"https://daily.dev/paolalola","image":"https://media.daily.dev/image/upload/s--1qiDxIi9--/f_auto/v1730284558/avatars/avatar_gPEtV1L8PcuhMT1PJ7bYe"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":9}}]} ```