--- title: Didact Fiber: Incremental reconciliation | daily.dev description: A deep-dive tutorial rebuilding React 16's Fiber architecture from scratch as a learning exercise called 'Didact'. Covers the fiber data structure... canonical: https://daily.dev/posts/didact-fiber-incremental-reconciliation-yzwbymwey twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Didact Fiber: Incremental reconciliation | daily.dev og:description: A deep-dive tutorial rebuilding React 16's Fiber architecture from scratch as a learning exercise called 'Didact'. Covers the fiber data structure... og:url: https://daily.dev/posts/didact-fiber-incremental-reconciliation-yzwbymwey og:image: https://api.daily.dev/og/posts/yzwBYmWEy.png og:image:alt: Didact Fiber: Incremental reconciliation 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. # Didact Fiber: Incremental reconciliation **[Rodrigo Pombo](https://daily.dev/sources/pomb)** · 16 min read · 0 upvotes · 0 comments ## Summary A deep-dive tutorial rebuilding React 16's Fiber architecture from scratch as a learning exercise called 'Didact'. Covers the fiber data structure (parent/child/sibling/alternate properties), incremental reconciliation using requestIdleCallback for scheduling, the work-in-progress tree concept, effect tags (PLACEMENT, UPDATE, DELETION), and the commit phase for DOM mutations. Explains why recursive reconciliation was replaced with a loop-based approach to allow pausing and resuming work without blocking the main thread. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [A deep dive into React Fiber](https://daily.dev/posts/a-deep-dive-into-react-fiber-02afflafp) · LogRocket · 16 upvotes · 0 comments - [React Behind The Scenes: Virtual DOM, Reconciliation, Render Phase, Commit Phase & Fiber Explained.](https://daily.dev/posts/react-behind-the-scenes-virtual-dom-reconciliation-render-phase-commit-phase-fiber-explained--9uynk7eyd) · Medium · 5 upvotes · 0 comments - [Reactive Depth: Building a Scroll-Driven 3D Image Tube with React Three Fiber](https://daily.dev/posts/reactive-depth-building-a-scroll-driven-3d-image-tube-with-react-three-fiber-wk7ebqcso) · Codrops · 0 upvotes · 0 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#react](https://daily.dev/tags/react) [View this post on daily.dev](https://daily.dev/posts/didact-fiber-incremental-reconciliation-yzwbymwey) ```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":"Didact Fiber: Incremental reconciliation","url":"https://daily.dev/posts/didact-fiber-incremental-reconciliation-yzwbymwey","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/didact-fiber-incremental-reconciliation-yzwbymwey"},"datePublished":"2026-03-31T12:30:12.878Z","dateModified":"2026-03-31T12:40:14.167Z","description":"A deep-dive tutorial rebuilding React 16's Fiber architecture from scratch as a learning exercise called 'Didact'. 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