Algorithms and Data Structures in TypeScript – Free Book (~400 Pages)
I started writing this book 10 years ago in JavaScript, got through a few chapters (asymptotic notation, basic techniques, start of sorting), and then abandoned it. Recently I picked it back up, converted everything to TypeScript, and used AI (Zenflow [1] + Claude Opus 4.6) to complete the remaining chapters. I provided the structure, direction, and initial chapters; the AI generated the bulk of the remaining content under a spec-driven workflow. The book covers roughly a first 1-2 year CS curriculum: sorting, dynamic programming, graph algorithms, trees, heaps, hash tables, and more. All…
Algorithms and Data Structures in TypeScript – Free Book (~400 Pages) launched on March 13, 2026 with 65 votes, #680 of 23,380 launches that month and more than 95% of that year's launches.
In plain words
This free, open-source book covers core computer science topics including sorting, dynamic programming, graph algorithms, trees, heaps, and hash tables in TypeScript. Written over a decade and completed with AI assistance, it provides approximately 400 pages of executable, typed code with comprehensive tests. The book targets students and developers learning fundamental algorithms and data structures, offering practical implementations suitable for a first one-to-two year CS curriculum. All code examples are runnable and tested, with the material available under an MIT license.
written from the facts on this page · September 2026
From the sources
A free, comprehensive book on algorithms and data structures — with idiomatic TypeScript 5 implementations, complexity analysis, exercises, and a full Vitest test suite. Covers sorting, graphs, dynamic programming, and more.
Algorithms with TypeScript is a free, comprehensive textbook covering algorithms and data structures from first principles to advanced topics. Spanning 22 chapters across six parts, it features idiomatic TypeScript 5 implementations, step-by-step complexity analysis, exercises, and a full test suite using Vitest — bridging the gap between academic Computer Science theory and practical software engineering. Beta: This book is currently in beta and is still under active review. It may contain errors or incomplete sections. Report errors or issues — contributions are welcome via the GitHub repository . This book grew out of a simple observation: most software engineers use algorithms and data…from amoilanen.github.io
In the maker’s words, at launch
I started writing this book 10 years ago in JavaScript, got through a few chapters (asymptotic notation, basic techniques, start of sorting), and then abandoned it. Recently I picked it back up, converted everything to TypeScript, and used AI (Zenflow [1] + Claude Opus 4.6) to complete the remaining chapters. I…
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