--- title: What’s going wrong with this Kotlin code? | daily.dev description: A Kotlin code puzzle where a duplicate ID check fails despite strings appearing identical in logs. The challenge invites developers to diagnose why the same... canonical: https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--qmmiiyb4l twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: What’s going wrong with this Kotlin code? | daily.dev og:description: A Kotlin code puzzle where a duplicate ID check fails despite strings appearing identical in logs. The challenge invites developers to diagnose why the same... og:url: https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--qmmiiyb4l og:image: https://api.daily.dev/og/posts/QMmiIyB4L.png og:image:alt: What’s going wrong with this Kotlin 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. # What’s going wrong with this Kotlin code? **[Google for Developers](https://daily.dev/sources/googledevelopers)** · 1 min read · 0 upvotes · 0 comments ## Summary A Kotlin code puzzle where a duplicate ID check fails despite strings appearing identical in logs. The challenge invites developers to diagnose why the same request passes through twice, hinting at a subtle string comparison or equality issue. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [The Country That Broke Kotlin](https://daily.dev/posts/the-country-that-broke-kotlin-nh3zz1ock) · Medium · 0 upvotes · 0 comments --- Tags: [#kotlin](https://daily.dev/tags/kotlin) [View this post on daily.dev](https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--qmmiiyb4l) ```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":"What’s going wrong with this Kotlin code?","url":"https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--qmmiiyb4l","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--qmmiiyb4l"},"datePublished":"2026-07-13T13:12:20.944Z","dateModified":"2026-09-14T05:59:50.438Z","description":"A Kotlin code puzzle where a duplicate ID check fails despite strings appearing identical in logs. 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