📋 Cheat Sheets

Developer Cheat Sheets

Quick reference pages for interviews, code reviews and daily development. Bookmark them.

CHEAT SHEET
Java Collections Cheat Sheet
Quick reference for Java Collections — ArrayList, LinkedList, HashMap, TreeMap, ...
CHEAT SHEET
Java Streams API Cheat Sheet
Complete Java Streams cheat sheet — intermediate and terminal operations, collec...
CHEAT SHEET
Python Built-in Functions Cheat Sheet
Complete reference for Python built-in functions — type conversion, math, sequen...
CHEAT SHEET
SQL Joins Cheat Sheet
Visual reference for all SQL JOIN types — INNER, LEFT, RIGHT, FULL OUTER, CROSS ...
CHEAT SHEET
Docker Commands Cheat Sheet
Essential Docker commands reference — containers, images, volumes, networks, Doc...
CHEAT SHEET
JVM Memory Model Diagram
Visual diagram of JVM memory areas — Heap, Young/Old generation, Metaspace, Stac...
CHEAT SHEET
How HashMap Works Internally
Illustrated diagram of Java HashMap internals — hashing, bucket array, collision...
CHEAT SHEET
Microservices Cheat Sheet
Visual reference for microservices architecture — API gateway, services, message...
CHEAT SHEET
Pandas Cheat Sheet
Quick reference for Pandas — DataFrame creation, selection, filtering, groupby, ...
CHEAT SHEET
Data Structures & Algorithms Cheat Sheet
Complete DSA quick reference — time/space complexities, Java implementations, so...