Reference Sheets

A collection of high-density, implementation-focused reference sheets for systems programmers.

Languages

Bash

C

C#

C++

Go

Java

JavaScript

Kotlin

Lua

Node.js

Objective-C

PHP

PowerShell

Python

Ruby

Rust

Swift

ZSH

Databases

MySQL

Oracle

PostgreSQL

SQLite

SQL Server (MSSQL)

Data Processing

Pandas

PySpark

Philosophy

  • Implementation-Driven: Focuses on immediate “how-to” code rather than conceptual theory.
  • Zero-Dependency: Strictly limited to standard libraries and ubiquitous system tools (no pip, npm, or cargo).
  • Ready-to-Run: Provides self-contained, copy-pasteable snippets including all imports and headers.
  • Systems-Focused: Prioritizes low-level tasks like binary packing, byte streams, and raw socket networking.