# The Data Structures Behind Text Editors: Gap Buffers, Piece Tables, Ropes, and CRDTs

DevFeed: [The Data Structures Behind Text Editors: Gap Buffers, Piece Tables, Ropes, and CRDTs](<https://devfeed.tech/articles/the-data-structures-behind-text-editors-gap-buffers-piece-tables-ropes-and-crdts-39655.md>)

Original publisher: [Read original article](<https://www.gauravsarma.com/posts/2026-04-05_text-editor-data-structures>)

Published: 2026-04-05T00:00:00Z

Content type: tutorial

Language: en

Sources: [Gaurav Sarma's Blog](<https://devfeed.tech/sources/gaurav-sarma-s-blog.md>)

Topics: [Data structures](<https://devfeed.tech/topics/data-structures.md>), [distributed-systems](<https://devfeed.tech/topics/distributed-systems.md>)

Tags: [data-structures](<https://devfeed.tech/tags/data-structures.md>), [delete](<https://devfeed.tech/tags/delete.md>), [distributed-systems](<https://devfeed.tech/tags/distributed-systems.md>), [editor](<https://devfeed.tech/tags/editor.md>), [file](<https://devfeed.tech/tags/file.md>), [insert](<https://devfeed.tech/tags/insert.md>), [memory](<https://devfeed.tech/tags/memory.md>), [search](<https://devfeed.tech/tags/search.md>), [syntax-highlighting](<https://devfeed.tech/tags/syntax-highlighting.md>)

## AI overview

This tutorial explains how text editors represent document buffers in memory. It compares gap buffers, piece tables, ropes, and CRDTs, focusing on the trade-offs among insertion, deletion, reading, cursor movement, memory efficiency, latency, and multi-user concurrency.

## Source excerpt

Open a text editor, type a character, and it appears on screen. That single keystroke triggers a surprisingly deep question: how does the editor represent your document in memory so that insertions, deletions, and cursor movements all feel instant, even on a file with millions of lines...