--- title: "Arrays, objects… now ‘composites’? – Frontend Masters Blog" url: https://daily.dev/posts/arrays-objects-now-composites-frontend-masters-blog-wmi32ct9u source_url: https://frontendmasters.com/blog/arrays-objects-now-composites type: article source: "Frontend Masters" published: 2026-05-11T23:19:34.475Z updated: 2026-05-11T23:20:04.481Z tags: ["javascript"] reading_time: 1 upvotes: 8 comments: 0 language: 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. # Arrays, objects… now ‘composites’? – Frontend Masters Blog **[Frontend Masters](https://daily.dev/sources/frontendmasters)** · 1 min read · 8 upvotes · 0 comments ## Summary A brief overview of the TC39 Composites proposal for JavaScript, which aims to solve the long-standing problem of value-based object comparison. Unlike plain objects, Composites support structural equality checks via `Composite.equal()` and can be used as Map keys. The proposal is seen as a more viable alternative to the earlier Records & Tuples proposal, which was dropped due to performance concerns. The proposal is still in early discussion stages. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [What's actually new in JavaScript \(and what's coming next\)](https://daily.dev/posts/what-s-actually-new-in-javascript-and-what-s-coming-next--nffnrggpd) · Neciu Dan · 66 upvotes · 5 comments - [Most JavaScript Developers Get == Wrong in Interviews \(Not Because It's Hard\)](https://daily.dev/posts/most-javascript-developers-get-wrong-in-interviews-not-because-it-s-hard--i6iheuzwh) · Medium · 1 upvotes · 0 comments --- Tags: [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/arrays-objects-now-composites-frontend-masters-blog-wmi32ct9u)