Using Gauss summation to add numbers faster

Evaluating time-space complexity of gauss summation

RSA Encryption in nodejs

with code samples

Enforce that all keys in a map are a key of a certain type

Convert an OpenSSH key into RSA PKCS1 format

Using the command line

How to redact sensitive information from logs

Using pino and pino-noir to redact things

How to Mock AWS S3 in a Jest (Unit) Test

Using jest.fn to mock aws-sdk

Testing stdout in Node.js using Jest

How to assert against stdout output in Node.js

Quick gotcha: localstack returning BadRequest

a quick gotcha if you keep getting `BadRequest` without a useful error message trying to connect another container to localstack S3

How to create an S3 bucket and add files and tags to it

Using localstack to develop on AWS locally

How require and module.exports in node works

How node runs your code

How to quickly change kubernetes contexts using kubectl

Some shortcuts & a bash function to quickly change contexts

Using Swagger 3.0 for request & response validation

quick tutorial on setting up a simple express service using swagger 3.0

How mutating state can lead to bugs in software

Some examples of how mutating state can introduce unexpected bugs

Bash script to dynamically open web pages straight from the terminal

Automate opening up pages with repetitive patterns

How to Group an array of objects by key

Group an array of objects into an object organised by a key of choice

Unit testing using sinon sandbox

Sinon sandbox makes stubbing much easier

Understanding hoisting in JavaScript

How variables get hoisted, and the difference between using const, let and var

Examples of closures in JavaScript

A few examples of closures, and how they offer re-usability.

How I came to love small objects and methods in Ruby

How I started writing more readable & testable functions

Using Sinon calledWith to assert that a function was called correctly

Using Sinon to unit test better

How to make a word replacement Chrome extension

How I made the 'brexit means breadsticks' chrome extension

How to use the JavaScript fetch API to get UK bank holidays

Make a self-updating UK bank holiday tracker