scorpionxdev

Markdown formatting reference

A quick reference for GitHub-Flavored Markdown. The rendered output is on the left in your head; the source is below. Headings markdown H1 H2 H3 Emphasis mar…

Useful Linux filesystem commands

A compact cheat sheet of filesystem commands I keep coming back to on the terminal. Moving around bash pwd where am I ls -lah long list, human sizes, include…

Debugging checklist

When something breaks and I have no idea why, I run through this list before touching any code. It turns panic into a process. 1. Reproduce it reliably A bug…

JavaScript async and await

async / await is syntax sugar over Promises that lets asynchronous code read top to bottom like normal code. Under the hood it is still Promises. The basics …

Git commands I use every day

A short reference of the Git commands I actually reach for daily. Not exhaustive, just the ones that earn their keep. Checking state bash git status what cha…

How caching improves application performance

Caching is storing the result of expensive work so you can reuse it instead of redoing it. Done well it is the highest-leverage performance tool you have. Do…

SwiftUI state management

SwiftUI rebuilds views from state. The trick is choosing the right property wrapper so ownership and updates flow the way you expect. The core property wrapp…

Kotlin coroutines overview

Coroutines are Kotlin's answer to asynchronous programming. They let you write concurrent code that reads sequentially, without blocking threads. Suspend fun…

SQL joins explained

A join combines rows from two tables based on a related column. The join type decides what happens to rows that have no match. Sample tables Say we have user…

Database indexing basics

An index is a sorted lookup structure that lets the database find rows without scanning the whole table. It is the single biggest lever for query speed, and …

React component design principles

A handful of principles that keep React components easy to change. None of them are rules, but ignoring all of them tends to produce components that are pain…

Clean code naming practices

Naming is the cheapest documentation you will ever write and the first thing the next reader sees. A good name removes the need for a comment. Say what it is…