2 October 2025
Single-line and multi-line formatting with Topiary
The second part of a tutorial on how to quickly write a formatter for a programming language using Topiary, our open-source formatting engine based on Tree-sitter.
programming-languages
10 April 2025
Practical recursion schemes in Rust: traversing and extending trees
This post introduces recursion schemes, a functional programming technique used to neatly express recursive algorithms and transformations on trees, and what they are good for in Rust specifically.
30 January 2025
Writing a formatter has never been so easy: a Topiary tutorial
This blog post is a tutorial on how to quickly write a formatter for a programming language from scratch using Topiary, our open-source formatting engine based on tree-sitter.
25 May 2023
Functional Python, Part III: The Ghost in the Machine
Commandeering techniques from richly typed, functional languages into Python for fun and profit. In this episode: Testing strategies.
19 January 2023
Functional Python, Part II: Dial M for Monoid
Commandeering techniques from richly typed, functional languages into Python for fun and profit. In this episode: Typeclasses and continuation-passing style.
1 December 2022
Higher-orderness is first-order interaction
Revisit the fundamental concept of higher-order functions with a new perspective: interaction.
8 September 2022
Functional Python, Part I: Typopædia Pythonica
Commandeering techniques from richly typed, functional languages into Python for fun and profit. In this episode: Gradual typing and algebraic data types.