Andrew Healey articles - 49 total
Creating Randomness Without Math.random
In JavaScript, you can create random numbers using Math.random(). But what if we wanted to create our...
A Practical Introduction to Graphs (Network Diagrams)
A graph is a structure that represents the connections between objects. They can be used for social n...
Polyfilling the Fetch API for Old Browsers and Node.js
First some definitions. A polyfill will try to emulate certain APIs, so can use them as if they wer...
The Flow of Knowledge in a Team (or Why I Dig Tickets)
Engineering tickets often end up meaning a lot. For the product but also emotionally for the individu...
Adding Comments to Gatsby with Netlify Serverless Functions + GitHub
I wanted to accept user comments on a Gatsby website and store them on GitHub. As in, I wanted the co...
Hacking Together an E-ink Dashboard
I realized I was asking Google Assistant the same questions over and over again. Like What's the curr...
How I'm Working Remotely
Madeline and I moved our living room around so our desks could be up against the blinds in the lighte...
Twitter Ticker Tape with a POS58 Receipt Printer
Screens tend to keep me awake in the evening so I wondered if I could print out my Twitter home timel...
Book Review: The Developer's Guide to Content Creation
I'm in year two of technical blogging and I've learned a lot. I have far far more views and comments...
DEV Article Analysis
My second passion alongside coding is writing. Whenever I can combine them, I do. This weekend I...
Gatsby Sparks Joy
I migrated from Jekyll to Gatsby recently and so far I've had a really neat time. The whole process t...
Hardest JavaScript Puzzle I've Ever Solved
I love code puzzles. Always have. My deskmate told me about a puzzle that no one in the office had be...
Let's Build a CAPTCHA Generator with Node.js
CAPTCHAs are not accessible and in some cases not even effective but there's a lot to be learned by g...
Cloning Memcached with Go
My first program in Go was Conway's Game of Life. This time I made an in-memory HTTP caching server w...
My First Golang Program
I’m new to Go. Over the last week, I completed A Tour of Go and tonight I wrote my first program, an...
I Built a Bot to Try and Get Money Back From My Internet Provider
In my contract with my ISP, they gave me a range of speeds to expect but also a speed that was the gu...
My Experience with Pair Programming
I learnt about pair programming at university when we were studying Agile methodologies. At the time...
An Introduction to Caching on the Web, With Examples in Python
What's a cache? A cache stores data so that future requests can receive it faster. Generat...
What If I Want My Website to Last for 100 Years?
When all other resources fail me, technical blogs come to the rescue. They provide insight into my pr...
A Tutorial on Tricking Google: Encoding Messages in Apostrophes
Genius suspected their lyrics were being scraped by Google but they needed a way to prove it. So they...
Your First Open-Source Pull Request: a Walkthrough
"You should contribute to open-source." — The Internet. Maybe you've seen this advice. Either from...
Refactoring JavaScript for Performance and Readability (with Examples!)
Recently, I wrote an article about how to write very fast JavaScript. Some of the examples took it to...
Saving Data in JavaScript Without a Database
You've just written a great piece of JavaScript. But when the running process stops, or the user refr...
Interview Question: Implement a Progress Bar
I saw this question doing the rounds on social media. Apparently, top companies are using it to scree...
Solving Puzzles With High-Performance JavaScript
Premature optimization is the root of all evil. It's also the root of this article. I like programmi...
A Tiny Project, From Inception to Deployment
When I was starting out, I never understood how to tackle 'projects'. It was hard to understand the s...
Continuous Deployment to Glitch via GitHub Webhooks
We're going to use Glitch as a free container platform to host our application. Better yet, it will h...
Fun With Linear Time: My Favorite Algorithm
A Linear Time Majority Vote Algorithm I love this algorithm because it's amazing and appro...
What They Don't Teach You at a Computer Science Masters
My B.A. is in Creative Writing. I applied to study a Masters in Computer Science to get better at the...
The Weird Rules I Set Myself That Got Me a Job
The following isn't good advice. It's just advice. And even that's a stretch. I used to be really in...