--- title: Immutability in JavaScript – Explained with Examples description: Immutability in JavaScript is an important concept for developers to understand. Primitives like strings and numbers are immutable by default, while arrays and... canonical: https://daily.dev/posts/immutability-in-javascript-explained-with-examples-5yl77mo3u twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Immutability in JavaScript – Explained with Examples | daily.dev og:description: Immutability in JavaScript is an important concept for developers to understand. Primitives like strings and numbers are immutable by default, while arrays and... og:url: https://daily.dev/posts/immutability-in-javascript-explained-with-examples-5yl77mo3u og:image: https://api.daily.dev/og/posts/5yl77MO3u.png og:image:alt: Immutability in JavaScript – Explained with Examples 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 JavaScript – Explained with Examples **[freeCodeCamp](https://daily.dev/sources/freecodecamp)** · 7 min read · 29 upvotes · 0 comments ## Summary Immutability in JavaScript is an important concept for developers to understand. Primitives like strings and numbers are immutable by default, while arrays and objects are mutable. However, developers can use techniques like the spread operator to achieve immutability with arrays and objects. Embracing immutability can lead to more predictable and consistent code, simpler debugging and maintenance, and adherence to functional programming principles. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/immutability-in-javascript-explained-with-examples-5yl77mo3u) ```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 JavaScript – Explained with Examples","url":"https://daily.dev/posts/immutability-in-javascript-explained-with-examples-5yl77mo3u","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/immutability-in-javascript-explained-with-examples-5yl77mo3u"},"datePublished":"2024-01-13T06:59:16.771Z","dateModified":"2024-01-13T06:59:14.772Z","description":"Immutability in JavaScript is an important concept for developers to understand. Primitives like strings and numbers are immutable by default, while arrays and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/0c4ff54132efd5578f1c601d7dbe70cf?_a=AQAEufR","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/0c4ff54132efd5578f1c601d7dbe70cf?_a=AQAEufR","isAccessibleForFree":true,"articleSection":"freeCodeCamp","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":"freeCodeCamp","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1628412854/logos/freecodecamp","url":"https://daily.dev/sources/freecodecamp"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/immutability-in-javascript-explained-with-examples-5yl77mo3u","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":29},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"javascript","timeRequired":"PT7M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"freeCodeCamp","item":"https://daily.dev/sources/freecodecamp"},{"@type":"ListItem","position":3,"name":"Immutability in JavaScript – Explained with Examples"}]} ```