Extending my Lisp compiler and adding a fast virtual machine.

Compiling Lisp to Bytecode and Running It

Visualizations and techniques for different maze generation algorithms.

Generating Mazes

Using ptrace to intercept and modify a process's getrandom syscall.

Making Python Less Random

Exploring patterns and systems for creating realtime browser games.

2D Multiplayer From Scratch

Lisp Compiler Optimizations

Transpiling Lisp to JavaScript using Rust.

Lisp to JavaScript Compiler

Creating my own developer tooling, and some thoughts on line profilers.

Adding a Line Profiler to My Language

Compressing CS2 Demos

Making my programming language 4000x quicker, and adding a static type checker.

A Custom WebAssembly Compiler

Building a demo player for coaches and analysts to visualize CS2 gameplay.

Rendering Counter-Strike Demos in the Browser

Building a fast boolean expression evaluation engine.

Porting Boolrule To Rust

Using seccomp and setrlimit to build a Python sandbox.

Running Untrusted Python Code

The highest user-joy-per-visit than any other project I'll ever work on.

Building Family Websites

Using Vercel's Build Output API to explore some framework ideas.

My Own Python Web Framework

Thoughts and reflections on my six week batch.

My Time At The Recurse Center

An overview of the sandboxing landscape, and some experiments with Deno.

Sandboxing JavaScript Code

How I added three new features to my text editor.

Implementing Highlighting, Search, and Undo

Writing my own quirky version of nano using the 2D game engine Ebitengine.

Making a Text Editor with a Game Engine

Rewriting library code to speed up my interpreter benchmark by 28%.

Profiling and Optimizing an Interpreter

Extending an existing tree-walk interpreter step by step.

Adding For Loops to an Interpreter

Sharing files with my friends from the terminal.

A Personal File Share CLI

Building a guessing game for popular open source projects.

CodeGuessr

A few ideas I tried. Including flamegraphs, fast HTTP routing, and infinite chess.

Recent Projects I Didn't Finish

Virtual Ants

Shipping a speedy key/value store for datasets larger than memory.

Implementing Bitcask, a Log-Structured Hash Table

Creating an automated solver for Sokoban puzzles.

Building and Solving Sokoban

Writing a fast file searching program and benchmarking it.

Beating grep with Go

I wrote a program that sends cats to my phone when I'm sad at the computer.

When I'm Sad My Computer Sends Me Cats

Using Web Workers and WebAssembly to build a speedy UI.

Designing a Code Playground for Adventlang

What is the minimum amount of features I need to not hate my life during this festive season?

Designing a Programming Language for Advent of Code

DOOM Rendered via Checkboxes

The sensation of incremental progress when programming with Rust.

Porting Niceware to Rust

Creating the Golfcart Programming Language

Building a live dashboard with the help of a few hardware modules.

Listening to Satellites with my Raspberry Pi

Picking the correct thread colors from embroidery hoop images.

Computer Vision and Embroidery

Applying photo geolocation estimation to the game of GeoGuessr.

GeoGuessing with Deep Learning

Building a technical demo to understand this blossoming area of technology.

WebAssembly Search Tools for Static Sites

Generating random but familiar text by building Markov chains from scratch.

Generating Text With Markov Chains

People that inspire me the most (and that I steal from most regularly).

Personal Websites and Internet Writing

Exploring the computational complexity of chess. Code snippets in Python so you can do the same.

Building My Own Chess Engine

Making a casual game more competitive and arguing with my friends about Elo systems.

Writing Software for an Among Us League

Picking up Ink and giving back to the community.

Learning the Ink Programming Language

Learning more about user data collection by writing my own analytics system.

Privacy Focused Analytics From Scratch

The famous flocking simulation built with the Ebiten game library.

Boids in WebAssembly Using Go

Building a replacement for JavaScript's random number generator.

Creating Randomness Without Math.random

Calculating the path between two countries with the least border crossings.

A Practical Introduction to Graphs (Network Diagrams)

A quick look at polyfilling, along with with solutions for both environments.

Polyfilling the Fetch API for Old Browsers and Node.js

Engineering tickets often end up meaning a lot. For the product but also emotionally for the individual.

The Flow of Knowledge in a Team (or Why I Dig Tickets)

Use Netlify serverless functions to let users add comments to a static website.

Adding Comments to Gatsby with Netlify Serverless Functions + GitHub

A prototype Raspberry Pi dashboard to save me talking to my smart assistant.

Hacking Together an E-ink Dashboard

Writing code, working (almost) solo, and exploring remote-life during the UK lockdown.

How I'm Working Remotely

Building a fun toy with my Raspberry Pi, Python, and Tweepy.

Twitter Ticker Tape with a POS58 Receipt Printer

Discussing an amazing resource for those writing for developers.

Book Review: The Developer's Guide to Content Creation

Building a tool for users to analyze their work over time.

DEV Article Analysis

Gatsby Sparks Joy

Writing JavaScript with a one character width restriction.

Hardest JavaScript Puzzle I've Ever Solved

Using Canvas, Express, and a GitHub Action.

Let's Build a CAPTCHA Generator with Node.js

Cloning Memcached with Go

My First Golang Program

I Built a Bot to Try and Get Money Back From My Internet Provider

My Experience with Pair Programming

An Introduction to Caching on the Web, With Examples in Python

What If I Want My Website to Last for 100 Years?

Using character codes to hide in plain sight.

A Tutorial on Tricking Google: Encoding Messages in Apostrophes

Making a small change to the Jekyll project.

Your First Open-Source Pull Request: a Walkthrough

Refactoring JavaScript for Performance and Readability (with Examples!)

The title is a lie I also show how to use SQLite.

Saving Data in JavaScript Without a Database

Interview Question: Implement a Progress Bar

Solving Puzzles With High-Performance JavaScript

A Tiny Project, From Inception to Deployment

Joining two of my favorite ecosystems together.

Continuous Deployment to Glitch via GitHub Webhooks

Breaking down the Boyer–Moore majority vote algorithm with examples in Python.

Fun With Linear Time: My Favorite Algorithm

What They Don't Teach You at a Computer Science Masters

The Weird Rules I Set Myself That Got Me a Job

How to Write an Awesome GitHub README

Let's learn how to pass data back and forth between languages.

Talking to Python from JavaScript (and Back Again!)

Learn the Storage API by Building a Note Taking App (Tutorial)

Embed Your Latest DEV Posts Anywhere (Tutorial)

Crawling a website for missing resources using the Python standard library.

Build a Python Bot to Find Your Website's Dead Links (Tutorial)

Answered: What the Heck is Code Golf?

Dust off your ternary expressions, we're going in.

JavaScript One-Liners That Make Me Excited

The basics of building a Reddit bot that listens for phrases and replies to them.

Need a Friend? Write a Reddit Bot with Python to Follow You Around (Tutorial)

How to setup Travis CI for a Node/Express project.

Earn a Build Passing Badge on GitHub! Testing Your Express App with Travis CI (Tutorial)

A lo-fi solution for streaming images from your Raspberry Pi to the web.

Coding a Live Cam for the Raspberry Pi in Python (Tutorial)

An overview of how I learned to code. Also a bit on my experience during my CS Masters.

How Flappy Bird Got Me My Start in Software

Living, working, building, and drinking too much coffee.

A Day in the Life of a Mediumly Productive Software Engineer

A little on the history of WebSockets and a brief overview on how to use them in JavaScript.

Kicking Butt and Taking Names With WebSockets (Tutorial)

Two Things About My First In-house Software Job That I Didn't See Coming

Creating GitHub badges based off the time when most people contribute to a GitHub project.

Creating Cute GitHub Badges Based Off a Project's Mood (Node.js)

Building a website which live streams every emoji posted to Reddit.com.

Real-Time Streaming of Every Emoji Posted as a Comment to Reddit.com

Goofy project in which you can play Sudoku entirely within your URL bar.

I Ported Sudoku to Your URL Bar and It Plays like a Dream

Writing an order tracker with Node, Express, and Firebase.

Cloning Dominos Order Tracker as a Microservice with Node.js and Firebase!

Benchmarking websocket servers and frameworks with async Python.

Benchmarking WebSocket Servers with Python!

Solutions for: Move Zeroes, Merge Two Sorted Lists, and Merge Two Binary Trees.

Leetcode - Episode 17 - Moving, Shaking, and Folding (3 x E)

Solutions for: Flipping an Image, Leaf-Similar Trees, and Maximum Depth of N-ary Tree.

Leetcode - Episode 16 - Pretty Efficient (3 x E)

Solutions for: Invert Binary Tree, N-ary Tree Postorder Traversal, and N-ary Tree Preorder Traversal.

Leetcode - Episode 15 - Three Tree Qs (3 x E)

Solutions for: Monotonic Array, Max Consecutive Ones, and Contains Duplicate.

Leetcode - Episode 14 - Short, Easy Solutions (3 x E)

Solutions for: Range Sum of BST, Max Increase to Keep City Skyline, and Custom Sort String.

Leetcode - Episode 13 - Finding My Stride (3 x M)

Solutions for: Verifying an Alien Dictionary, Reverse Only Letters, and Backspace String Compare.

Leetcode - Episode 12 - Starting Early (3 x E)

Solutions for: Reverse Vowels of a String, Isomorphic Strings, and Reverse Words in a String.

Leetcode - Episode 11 - Faster than 99.17% (1 x M, 2 x E)

Andrew Healey's blog and personal website. Software engineer, writer, creator.

Recent (110 articles)

Popular