Advanced
JavaScript Currying and CompositionCheatsheet
Transform multi-argument functions into chained calls and combine small functions into pipelines.
Build / Code
Code Cheatsheets
One-page quick reference sheets on code. Clear, example-driven build help when you need it.
Browse by Sub-Category
Advanced
JavaScript Event LoopCheatsheet
Learn how the call stack, microtask queue, and task queue control JavaScript execution order.
Advanced
JavaScript GeneratorsCheatsheet
Learn how generator functions pause and resume execution to build lazy sequences and iterables.
Intermediate
JavaScript Optional ChainingCheatsheet
Access nested properties safely with optional chaining and pair it with nullish coalescing for defaults.
Advanced
JavaScript Prototypal InheritanceCheatsheet
Understand the prototype chain, Object.create, and how class syntax wraps prototypal inheritance.
Advanced
JavaScript Proxy and ReflectCheatsheet
Learn how Proxy traps and the Reflect API intercept and control object behavior in JavaScript.
All Code Cheatsheets
Beginner
JavaScript StorageCheatsheet
Use localStorage and sessionStorage to persist data in the browser across sessions and refreshes.
Beginner
JavaScript DestructuringCheatsheet
Master object and array destructuring for cleaner variable assignment and function parameters.
Beginner
React Event HandlingCheatsheet
Handle user events in React with camelCase handlers, synthetic events, and controlled inputs.
Beginner
Next.js API Routes PatternsCheatsheet
Build REST APIs with route handlers, middleware, CORS, and auth patterns.
Beginner
Next.js DirectivesCheatsheet
Use use server and use client directives to control rendering and data access.
Beginner
Next.js Environment VariablesCheatsheet
Manage environment variables and configure Next.js for different environments.
Beginner
Next.js File StructureCheatsheet
Organize Next.js projects for maintainability and performance.
Beginner
Next.js Getting StartedCheatsheet
Set up a Next.js project and start building pages and API routes quickly.
Beginner
Next.js Image OptimizationCheatsheet
Optimize images in Next.js using the Image component for better performance.
Beginner
React useRef HookCheatsheet
Learn useRef fundamentals: DOM access, callback refs, useImperativeHandle, and React 19 ref-as-prop.
Beginner
TypeScript EnumsCheatsheet
Use enums effectively for type-safe constants and fixed sets of values.
Beginner
Next.js Font OptimizationCheatsheet
Load web fonts efficiently with next/font for performance and UX.
Beginner
Next.js Link and NavigationCheatsheet
Use the Link component and useRouter for fast client-side navigation in Next.js.
Beginner
React Fragment and KeysCheatsheet
Master React.Fragment, short syntax, and when keys are necessary.
Beginner
React useState HookCheatsheet
Manage React component state with useState to store and update values across renders.
Beginner
React Keys and ListsCheatsheet
Render lists efficiently with the key prop, understand reconciliation, and avoid common list rendering bugs.
Beginner
React Props and ChildrenCheatsheet
Master prop drilling, children, and patterns for composable component APIs.
Beginner
TypeScript Enums Best PracticesCheatsheet
Use enums effectively for type-safe constants and avoid common pitfalls.
Beginner
JavaScript LoopsCheatsheet
Pick the right loop in JavaScript with for, while, for-of, for-in, and array methods.
Beginner
JavaScript String MethodsCheatsheet
Master string manipulation with substring, slice, replace, split, and common text operations.
Beginner
JavaScript Template LiteralsCheatsheet
Learn template literals, string interpolation, multiline strings, and tagged templates for cleaner code.
Beginner
JavaScript Try CatchCheatsheet
Handle errors safely with try-catch patterns for async code, error propagation, global handlers, and JSON parsing.
Beginner
JavaScript Arrow FunctionsCheatsheet
Learn arrow function syntax, implicit returns, and lexical this with clear practical examples.
Beginner
JavaScript Date and TimeCheatsheet
Create, format, and modify dates in JavaScript with timestamps, UTC, and common calculations.
Beginner
JavaScript Debugging ToolsCheatsheet
Quick debugging one-liners for logging, tracing, timing, and inspecting JavaScript values in any project.
Beginner
JavaScript DOM ManipulationCheatsheet
Select, edit, style, and create DOM elements with vanilla JavaScript and handle user events.
Beginner
JavaScript Object ManipulationCheatsheet
Create, clone, merge, and transform JavaScript objects with modern syntax and practical patterns.
Beginner
JavaScript Array MethodsCheatsheet
A quick reference for adding, transforming, searching, and ordering items in JavaScript arrays.
Beginner
Next.js Dynamic RoutesCheatsheet
Create dynamic pages with brackets, access route params, and generate static paths with generateStaticParams.
Beginner
React Conditional RenderingCheatsheet
Show or hide elements in React using if statements, ternaries, logical operators, and switch patterns.
Beginner
React Forms HandlingCheatsheet
Build and manage controlled forms in React with inputs, validation, and submit handlers.
Beginner
TypeScript BasicsCheatsheet
A starter guide to TypeScript covering types, variables, and basic syntax for newcomers.
Beginner
TypeScript ClassesCheatsheet
A guide to TypeScript classes, constructors, access modifiers, and inheritance with practical examples.
Beginner
TypeScript InterfacesCheatsheet
Learn how interfaces define object shapes, optional properties, and contracts for cleaner typed code.
Beginner
TypeScript ModulesCheatsheet
Learn how to organize TypeScript code using ES modules, named exports, and default exports.
Beginner
TypeScript Tsconfig OptionsCheatsheet
Quick reference for the most important tsconfig.json options to configure your TypeScript projects.
Beginner
TypeScript Type AliasesCheatsheet
Understand type aliases, unions, and intersections to make your TypeScript code more expressive.