--- title: Refactoring old code | daily.dev description: A colleague asked me to write an extension on an old codebase. The old code was using loops and wasn't really efficient with the tools we have nowadays. I... canonical: https://daily.dev/posts/refactoring-old-code-arjkzpemg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Refactoring old code | daily.dev og:description: A colleague asked me to write an extension on an old codebase. The old code was using loops and wasn't really efficient with the tools we have nowadays. I... og:url: https://daily.dev/posts/refactoring-old-code-arjkzpemg og:image: https://api.daily.dev/og/posts/ArjkZpEmG.png og:image:alt: Refactoring old code 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. # Refactoring old code **[Hashnode](https://daily.dev/sources/hashnode)** · [@dailydevtips](https://daily.dev/dailydevtips) · 4 min read · 57 upvotes · 7 comments ## Summary A colleague asked me to write an extension on an old codebase. The old code was using loops and wasn't really efficient with the tools we have nowadays. I decided to use the Map method to map the data into the desired format. The last thing we need is to have the array sorted based on the number variable. ## 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. **@way2extreme** · 3 upvotes > The comments on this article are hilarious. It would seem that most people disagree with the author. **@bscott** · 2 upvotes > Good read ## 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: [#angular](https://daily.dev/tags/angular), [#general-programming](https://daily.dev/tags/general-programming), [#html](https://daily.dev/tags/html), [#react](https://daily.dev/tags/react), [#vuejs](https://daily.dev/tags/vuejs) [View this post on daily.dev](https://daily.dev/posts/refactoring-old-code-arjkzpemg) ```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":"Refactoring old code","url":"https://daily.dev/posts/refactoring-old-code-arjkzpemg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/refactoring-old-code-arjkzpemg"},"datePublished":"2021-01-14T12:09:49.426Z","dateModified":"2026-03-15T03:53:13.109Z","description":"A colleague asked me to write an extension on an old codebase. 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It would seem that most people disagree with the author.","datePublished":"2021-01-19T13:47:53.267Z","url":"https://daily.dev/posts/ArjkZpEmG#c-pZRmyrZ8Q","author":{"@type":"Person","name":"Rod Hartzell","url":"https://daily.dev/way2extreme","image":"https://avatars3.githubusercontent.com/u/862497?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":3}},{"@type":"Comment","text":"Good read","datePublished":"2021-01-15T06:18:59.430Z","url":"https://daily.dev/posts/ArjkZpEmG#c-p5in_BHtI","author":{"@type":"Person","name":"Brian Scott","url":"https://daily.dev/bscott","image":"https://avatars1.githubusercontent.com/u/191290?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2}}]} ```