tear along the dotted line ✂

Cheat sheets

Dense one-pagers for last-minute revision. Open one, hit print (or save as PDF) and stick it on your wall the night before the interview.

JavaScript Essentials

48 must-know facts & snippets

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TypeScript

From unknown to infer, on one page

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TypeScript Utility Types

Partial → Awaited, all of them

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React

Rendering to Server Components, on one page

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React Hooks

Every hook, one example each

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Angular

Signals to guards, standalone-first

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RxJS Operators

The 30 operators you'll actually use

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HTML & CSS

Semantics to grid, cascade to stacking

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Node.js

Event loop to streams, checked on Node 22

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Java

OOP to virtual threads, on one page

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Spring Boot

Beans to JWT and @Transactional, one page

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SQL & PostgreSQL

Joins to MVCC, every query run on Postgres 16

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Docker

Dockerfile to Compose, layers to PID 1

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Git & CI/CD

Staging area to canary deploys, on one page

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Data Structures & Algorithms

Big-O to DP, with Python templates

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System Design

Rendering to caching, plus five mini-designs

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