Adding Go's defer to the TypeScript Compiler
Forking tsc to support Go's defer.
Andrew Healey's Blog
Andrew Healey's blog and personal website. Software engineer, writer, creator.
Latest posts
A Tiny Compiler for Data-Parallel Kernels
Exploring how compilers lower ordinary loops into explicit data-parallel kernels.
Building a Runtime with QuickJS
Building a tiny JavaScript runtime on top of QuickJS with timers, file I/O, and an event loop.
Building a Shell
I built a tiny shell in C to learn what fork, execvp, and dup2 are doing under the hood.
A Fair, Cancelable Semaphore in Go
Building a fair, cancelable semaphore in Go and the subtle concurrency issues involved.
Solving NYT's Pips Puzzle
A solver for The New York's Times' daily Pips puzzle.
Compiling a Forth
A bytecode compiler and VM for a Forth-like language.
Icepath: a 2D Programming Language
Sliding around a cave and hitting opcodes.
Counting Words at SIMD Speed
Rewriting a word counting program five times until it's 494x faster.
Optimizing My Disk Usage Program
Increasing performance by reducing thread scheduling overhead and lock contention.
Maybe the Fastest Disk Usage Program on macOS
A very fast du -sh clone for macOS.
Filesystem Backed by an LLM
FUSE filesystem where file operations are handled by an LLM.
Solving Queuedle
Writing a game solver for Queuedle.
How I Made Queuedle
A daily word-sliding puzzle game inspired by Wordle and Scrabble.
Visualizing Chess Bitboards
Brief introduction to chess bitboards and move generation with animations.
Installing NPM Packages Very Quickly
Building a package manager with a fast install step.
Building Game Prototypes with LÖVE
Chess, card games, and Lua.
Compiling Lisp to Bytecode and Running It
Extending my Lisp compiler and adding a fast virtual machine.
Generating Mazes
Visualizations and techniques for different maze generation algorithms.
Making Python Less Random
Using ptrace to intercept and modify a process's getrandom syscall.
2D Multiplayer From Scratch
Exploring patterns and systems for creating realtime browser games.
Lisp Compiler Optimizations
Smaller programs that do less work.
Lisp to JavaScript Compiler
Transpiling Lisp to JavaScript using Rust.
Adding a Line Profiler to My Language
Creating my own developer tooling, and some thoughts on line profilers.
Compressing CS2 Demos
Shrinking demo data by a factor of 13x.
A Custom WebAssembly Compiler
Making my programming language 4000x quicker, and adding a static type checker.
Rendering Counter-Strike Demos in the Browser
Building a demo player for coaches and analysts to visualize CS2 gameplay.
Porting Boolrule To Rust
Building a fast boolean expression evaluation engine.
Running Untrusted Python Code
Using seccomp and setrlimit to build a Python sandbox.
Building Family Websites
The highest user-joy-per-visit than any other project I'll ever work on.
My Own Python Web Framework
Using Vercel's Build Output API to explore some framework ideas.
My Time At The Recurse Center
Thoughts and reflections on my six week batch.
Sandboxing JavaScript Code
An overview of the sandboxing landscape, and some experiments with Deno.
Implementing Highlighting, Search, and Undo
How I added three new features to my text editor.
Making a Text Editor with a Game Engine
Writing my own quirky version of nano using the 2D game engine Ebitengine.
Profiling and Optimizing an Interpreter
Rewriting library code to speed up my interpreter benchmark by 28%.
Adding For Loops to an Interpreter
Extending an existing tree-walk interpreter step by step.
A Personal File Share CLI
Sharing files with my friends from the terminal.
CodeGuessr
Building a guessing game for popular open source projects.
Recent Projects I Didn't Finish
A few ideas I tried. Including flamegraphs, fast HTTP routing, and infinite chess.
Virtual Ants
Artificial life and Langton's ant.
Implementing Bitcask, a Log-Structured Hash Table
Shipping a speedy key/value store for datasets larger than memory.
Building and Solving Sokoban
Creating an automated solver for Sokoban puzzles.
Beating grep with Go
Writing a fast file searching program and benchmarking it.
When I'm Sad My Computer Sends Me Cats
I wrote a program that sends cats to my phone when I'm sad at the computer.
Designing a Code Playground for Adventlang
Using Web Workers and WebAssembly to build a speedy UI.
Designing a Programming Language for Advent of Code
What is the minimum amount of features I need to not hate my life during this festive season?
DOOM Rendered via Checkboxes
WebAssembly meets 16000 HTML checkboxes.
Porting Niceware to Rust
The sensation of incremental progress when programming with Rust.
Creating the Golfcart Programming Language
Writing an interpreter from scratch.