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Cheatsheets

Quick reference guides for common programming languages, frameworks, and tools. Bookmark this page for easy access.

Version Control

Git Commands

Essential Git commands for version control

git clone <url> - Clone a repository

git add . - Stage all changes

git commit -m "message" - Commit changes

git push origin main - Push to remote

git pull - Fetch and merge

git branch <name> - Create branch

git checkout <branch> - Switch branches

git merge <branch> - Merge branch

git stash - Stash changes

git log --oneline - Compact history

JavaScript

JavaScript ES6+

Modern JavaScript syntax and features

const/let - Block-scoped variables

Arrow functions: () => {}

Template literals: `Hello ${name}`

Destructuring: { a, b } = obj

Spread operator: [...arr]

Rest parameters: (...args)

Promises: .then().catch()

Async/await

Array methods: map, filter, reduce

Optional chaining: obj?.prop

Python

Python Basics

Python syntax quick reference

List comprehension: [x for x in range(10)]

Dictionary: {key: value}

Lambda: lambda x: x * 2

f-strings: f"Hello {name}"

try/except/finally

with open() as file:

__init__(self) - Constructor

pip install <package>

virtualenv venv

if __name__ == "__main__":

React

React Hooks

React hooks at a glance

useState - State management

useEffect - Side effects

useContext - Context consumer

useReducer - Complex state

useCallback - Memoize callbacks

useMemo - Memoize values

useRef - Refs and persistence

useLayoutEffect - Sync effects

Custom hooks: use<Name>

Rules: Top-level only

Database

SQL Queries

Common SQL operations

SELECT * FROM table

WHERE condition

ORDER BY column ASC/DESC

GROUP BY column

JOIN table ON condition

LEFT/RIGHT/FULL JOIN

INSERT INTO table VALUES

UPDATE table SET column = value

DELETE FROM table WHERE

CREATE INDEX ON table(column)

DevOps

Terminal Commands

Essential command line

ls -la - List all files

cd <dir> - Change directory

mkdir <dir> - Create directory

rm -rf <dir> - Remove recursively

cp -r <src> <dest> - Copy

mv <src> <dest> - Move/rename

cat <file> - View file

grep "pattern" file - Search

chmod +x file - Make executable

curl -X GET <url> - HTTP request

TypeScript

TypeScript Essentials

TypeScript type annotations

type Alias = string | number

interface IUser { name: string }

Array<T> or T[]

Record<K, V> - Object type

Partial<T> - All optional

Required<T> - All required

Pick<T, K> - Select keys

Omit<T, K> - Exclude keys

keyof T - Union of keys

typeof variable - Type from value

CSS

CSS Flexbox & Grid

Modern CSS layouts

display: flex/grid

justify-content: center

align-items: center

flex-direction: row/column

flex-wrap: wrap

gap: 1rem

grid-template-columns: repeat(3, 1fr)

grid-gap: 1rem

place-items: center

flex: 1 1 auto

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