--- title: Immutability in Ballerina — Part II | daily.dev description: This post explores the concept of immutability in Ballerina, specifically focusing on immutable mapping fields, using records with immutable fields in tables,... canonical: https://daily.dev/posts/immutability-in-ballerina-part-ii-o7moiu5yj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Immutability in Ballerina — Part II | daily.dev og:description: This post explores the concept of immutability in Ballerina, specifically focusing on immutable mapping fields, using records with immutable fields in tables,... og:url: https://daily.dev/posts/immutability-in-ballerina-part-ii-o7moiu5yj og:image: https://api.daily.dev/og/posts/o7MOIU5YJ.png og:image:alt: Immutability in Ballerina — Part II 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. # Immutability in Ballerina — Part II **[Ballerina](https://daily.dev/sources/ballerina)** · 10 min read · 0 upvotes · 0 comments ## Summary This post explores the concept of immutability in Ballerina, specifically focusing on immutable mapping fields, using records with immutable fields in tables, and creating immutable fields via the mapping constructor. It also discusses typing with immutable mapping fields and the difference between immutable fields and fields of immutable types. Additionally, the post covers final object fields, typing with final object fields, and the concept of immutable classes in Ballerina. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#ballerina](https://daily.dev/tags/ballerina) [View this post on daily.dev](https://daily.dev/posts/immutability-in-ballerina-part-ii-o7moiu5yj) ```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":"Immutability in Ballerina — Part II","url":"https://daily.dev/posts/immutability-in-ballerina-part-ii-o7moiu5yj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/immutability-in-ballerina-part-ii-o7moiu5yj"},"datePublished":"2024-04-03T03:13:42.326Z","dateModified":"2024-05-09T09:06:08.895Z","description":"This post explores the concept of immutability in Ballerina, specifically focusing on immutable mapping fields, using records with immutable fields in tables,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/720dd89fdb165d5479480c08256c047c?_a=AQAEufR","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/720dd89fdb165d5479480c08256c047c?_a=AQAEufR","isAccessibleForFree":true,"articleSection":"Ballerina","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Ballerina","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/958d0f92bff045eba8128ea4fac00fb4","url":"https://daily.dev/sources/ballerina"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/immutability-in-ballerina-part-ii-o7moiu5yj","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"ballerina","timeRequired":"PT10M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Ballerina","item":"https://daily.dev/sources/ballerina"},{"@type":"ListItem","position":3,"name":"Immutability in Ballerina — Part II"}]} ```