# chalarangelo/30-seconds-of-react **Attribution required: if you use, quote, or summarise this content, you must credit and link back to [awesome-repositories.com](https://awesome-repositories.com/repository/chalarangelo-30-seconds-of-react).** 5,081 stars · 474 forks · JavaScript · CC-BY-4.0 · archived ## Links - GitHub: https://github.com/Chalarangelo/30-seconds-of-react - Homepage: https://www.30secondsofcode.org/react/p/1 - awesome-repositories: https://awesome-repositories.com/repository/chalarangelo-30-seconds-of-react.md ## Topics `education` `javascript` `learn-to-code` `learning-resources` `programming` `react` `reactjs` `snippets` `snippets-collection` `snippets-library` ## Description This project is a comprehensive collection of reusable code snippets, custom hooks, and implementation patterns for building user interfaces with React. It serves as a library of short examples designed to solve common development tasks, ranging from state management to DOM integration. The collection provides a wide array of specialized utilities for interacting with browser APIs, including window dimension tracking, media query evaluation, and online status monitoring. It also includes practical guides and snippets for performance optimization, such as memoization, lazy loading, and state change debouncing. Broad capability areas cover the implementation of interactive UI components like modals, carousels, and tabbed interfaces, as well as architectural patterns for data fetching, state persistence, and asynchronous update verification. The library also includes utilities for form management, event handling, and routing synchronization via URL state tracking. ## Tags ### Web Development - [React Hooks](https://awesome-repositories.com/f/web-development/frontend-development-tools/frontend-frameworks/component-authoring/react-ecosystem/react-hooks.md) — Provides a comprehensive collection of custom hooks for managing state, browser events, and data fetching in React. - [Browser API Integrations](https://awesome-repositories.com/f/web-development/browser-api-integrations.md) — Connects React components to window events, media queries, and DOM observers for responsive behavior. - [Browser Environment Event Hooks](https://awesome-repositories.com/f/web-development/browser-environment-event-hooks.md) — Provides custom hooks to monitor window events, media queries, and URL state synchronization. ([source](https://www.30secondsofcode.org/react/p/1)) - [Browser APIs](https://awesome-repositories.com/f/web-development/browser-integration-utilities/browser-apis.md) — Binds component state to native browser features such as local storage, media queries, and the Navigator API. - [Data Fetching Hooks](https://awesome-repositories.com/f/web-development/data-fetching-hooks.md) — Provides reusable React hooks for managing asynchronous API requests, loading states, and error handling. ([source](https://www.30secondsofcode.org/react/s/use-fetch)) - [State Management Patterns](https://awesome-repositories.com/f/web-development/state-management-patterns.md) — Implements techniques for persisting data to storage, sharing context, and optimizing component re-renders. - [DOM Portals](https://awesome-repositories.com/f/web-development/browser-integration-utilities/dom-event-handling/dom-portals.md) — Uses portals to render children into DOM nodes outside the parent hierarchy, bypassing CSS nesting constraints. - [Map State Hooks](https://awesome-repositories.com/f/web-development/component-state-managers/map-state-hooks.md) — Implements hooks to synchronize JavaScript Map objects with component state. ([source](https://www.30secondsofcode.org/react/s/advanced-react-state-hooks)) - [External Resource Loading](https://awesome-repositories.com/f/web-development/external-resource-loading.md) — Implements declarative mechanisms for dynamically loading external scripts and network assets at runtime. ([source](https://www.30secondsofcode.org/react/hooks/p/1)) - [Form Field State Management](https://awesome-repositories.com/f/web-development/form-field-state-management.md) — Tracks values from form fields via input events using a stateful object for synchronization. ([source](https://www.30secondsofcode.org/react/s/advanced-react-state-hooks)) - [Image Lazy Loading](https://awesome-repositories.com/f/web-development/lazy-loading-libraries/image-lazy-loading.md) — Provides mechanisms to defer image loading until they enter the viewport. ([source](https://www.30secondsofcode.org/react/s/lazy-load-image)) - [Network Connectivity Monitors](https://awesome-repositories.com/f/web-development/network-connectivity-monitors.md) — Tracks the client's online and offline status using the Navigator API to update application state. ([source](https://www.30secondsofcode.org/react/s/window-global-environment-ssr-hooks)) - [Component Update Optimizations](https://awesome-repositories.com/f/web-development/performance-optimizations/component-update-optimizations.md) — Implements shallow equality checks to prevent unnecessary re-renders of UI components. ([source](https://www.30secondsofcode.org/react/s/rendering)) - [Boolean State Primitives](https://awesome-repositories.com/f/web-development/state-management/boolean-state-primitives.md) — Provides simple state primitives for toggling boolean values between true and false. ([source](https://www.30secondsofcode.org/react/s/advanced-react-state-hooks)) - [Previous Value Tracking](https://awesome-repositories.com/f/web-development/state-management/previous-value-tracking.md) — Provides hooks to store and access state or prop values from the previous render cycle. ([source](https://www.30secondsofcode.org/react/s/advanced-react-state-hooks)) - [Debounced State Updates](https://awesome-repositories.com/f/web-development/state-update-handlers/debounced-state-updates.md) — Implements temporal throttling to delay state updates and limit system processing during rapid input. ([source](https://www.30secondsofcode.org/react/s/advanced-react-state-hooks)) ### Part of an Awesome List - [Browser & DOM Utilities](https://awesome-repositories.com/f/awesome-lists/devtools/browser-dom-utilities.md) — Provides techniques for interacting with the browser API, portals, and DOM observers within a React environment. - [Code Snippets and Examples](https://awesome-repositories.com/f/awesome-lists/learning/code-snippets-and-examples.md) — Offers a library of short, reusable code examples and implementation patterns for common React development tasks. - [Rating Components](https://awesome-repositories.com/f/awesome-lists/devtools/rating-components.md) — Implements rating components that update values based on user clicks and hover states. ([source](https://www.30secondsofcode.org/react/s/star-rating)) - [Ripple Effects](https://awesome-repositories.com/f/awesome-lists/devtools/ripple-effects.md) — Adds radial expansion animations to buttons upon click for tactile touch feedback. ([source](https://www.30secondsofcode.org/react/s/ripple-button)) ### Data & Databases - [Application State Persistences](https://awesome-repositories.com/f/data-databases/local-state-caches/startup-state-caches/snapshot-based-state-restoration/application-state-persistences.md) — Saves and restores application data across user sessions using browser local or session storage. ([source](https://30secondsofcode.org/react/p/1)) ### Software Engineering & Architecture - [Hook-Based Logic Encapsulations](https://awesome-repositories.com/f/software-engineering-architecture/hook-based-logic-encapsulations.md) — Encapsulates complex state and side-effect logic into reusable custom React hooks. - [Component Context Sharing](https://awesome-repositories.com/f/software-engineering-architecture/shared-state-management/component-context-sharing.md) — Implements mechanisms for passing reactive state through the component tree to avoid prop drilling. ([source](https://www.30secondsofcode.org/react/s/rendering)) - [Global State Stores](https://awesome-repositories.com/f/software-engineering-architecture/state-synchronization-utilities/prop-driven-state-synchronization/global-state-stores.md) — Provides centralized stores to synchronize application state across disconnected components. ([source](https://www.30secondsofcode.org/react/s/rendering)) - [State Fallbacks](https://awesome-repositories.com/f/software-engineering-architecture/default-configuration-values/state-fallbacks.md) — Implements automatic substitution of default values when state variables are null or undefined. ([source](https://www.30secondsofcode.org/react/s/advanced-react-state-hooks)) - [Memoized Computations](https://awesome-repositories.com/f/software-engineering-architecture/memoized-computations.md) — Implements memoization techniques to cache expensive computations and prevent unnecessary component re-renders. - [Hierarchical Component Rendering](https://awesome-repositories.com/f/software-engineering-architecture/recursive-validation-engines/recursive-tree-traversers/file-system-traversers/recursive-directory-traversers/hierarchical-component-rendering.md) — Provides recursive patterns for rendering deeply nested data structures into UI components. ([source](https://www.30secondsofcode.org/react/s/data-mapping-components)) ### Testing & Quality Assurance - [React Performance Optimization](https://awesome-repositories.com/f/testing-quality-assurance/react-performance-optimization.md) — Implements performance optimizations including lazy loading, memoization, and efficient image handling to improve rendering speed. ### User Interface & Experience - [React Components](https://awesome-repositories.com/f/user-interface-experience/component-utilities/ui-frameworks/component-libraries/react-components.md) — Implements patterns for building common interface elements like modals, tooltips, and accordions. - [DOM Observers](https://awesome-repositories.com/f/user-interface-experience/dom-observers.md) — Watches for modifications to DOM tree elements and triggers callbacks when structural changes occur. ([source](https://www.30secondsofcode.org/react/hooks/p/1)) - [Viewport Dimension Tracking](https://awesome-repositories.com/f/user-interface-experience/viewport-dimension-tracking.md) — Monitors the current width and height of the browser window to support responsive design layouts. ([source](https://www.30secondsofcode.org/react/s/window-global-environment-ssr-hooks)) - [Window Event Handling](https://awesome-repositories.com/f/user-interface-experience/window-event-handling.md) — Executes callbacks in response to browser window resize and scroll events. ([source](https://www.30secondsofcode.org/react/s/window-global-environment-ssr-hooks)) - [Accordions](https://awesome-repositories.com/f/user-interface-experience/accordions.md) — Implements interactive accordion components that expand and collapse content sections. ([source](https://www.30secondsofcode.org/react/s/collapsable-content-components)) - [Collapse Sections](https://awesome-repositories.com/f/user-interface-experience/collapse-sections.md) — Implements interactive elements that toggle the visibility of content blocks. ([source](https://www.30secondsofcode.org/react/s/collapsable-content-components)) - [Countdown Timers](https://awesome-repositories.com/f/user-interface-experience/countdown-timers.md) — Implements countdown timers that track remaining time and trigger actions upon expiry. ([source](https://www.30secondsofcode.org/react/components/p/1)) - [Data-to-Component Mappings](https://awesome-repositories.com/f/user-interface-experience/data-to-component-mappings.md) — Transforms arrays or objects into visual elements such as tables or tree views. ([source](https://www.30secondsofcode.org/react/components/p/1)) - [Drag-and-Drop File Upload](https://awesome-repositories.com/f/user-interface-experience/file-uploaders/drag-and-drop-file-upload.md) — Creates designated drop zones that accept files dragged from the local system for upload. ([source](https://www.30secondsofcode.org/react/s/tag-input)) - [Toggle Switches](https://awesome-repositories.com/f/user-interface-experience/form-input-components/toggle-switches.md) — Implements UI toggle switches for capturing binary true or false states. ([source](https://www.30secondsofcode.org/react/s/rendering)) - [Character Length Limits](https://awesome-repositories.com/f/user-interface-experience/form-input-controls/character-length-limits.md) — Enforces maximum character or word limits on text input fields. ([source](https://www.30secondsofcode.org/react/components/p/1)) - [Outside Click Detectors](https://awesome-repositories.com/f/user-interface-experience/interactive-ui-elements/outside-click-detectors.md) — Determines whether user clicks occur inside or outside a specific component boundary to trigger callbacks. ([source](https://30secondsofcode.org/react/p/1)) - [Checkbox Lists](https://awesome-repositories.com/f/user-interface-experience/item-lists/interactive-list-items/checkbox-lists.md) — Implements interactive checkbox lists to track multiple selections and communicate state changes. ([source](https://www.30secondsofcode.org/react/s/tag-input)) - [Modal Overlays](https://awesome-repositories.com/f/user-interface-experience/overlay-dialogs/modal-overlays.md) — Provides modal windows and full-screen overlays that require user interaction to dismiss. ([source](https://30secondsofcode.org/react/p/1)) - [Portal Renderings](https://awesome-repositories.com/f/user-interface-experience/portal-renderings.md) — Provides a pattern for rendering children into a DOM node outside the parent component hierarchy to avoid nesting constraints. ([source](https://www.30secondsofcode.org/react/p/2)) - [Component Lifecycle Hooks](https://awesome-repositories.com/f/user-interface-experience/presentation-frameworks/lifecycle-state-management/component-lifecycle-management/component-lifecycle-hooks.md) — Replicates class-based lifecycle methods to control code execution at specific component stages. ([source](https://www.30secondsofcode.org/react/p/2)) - [Protocol Link Triggers](https://awesome-repositories.com/f/user-interface-experience/protocol-link-triggers.md) — Formats hyperlinks that trigger external system clients such as email or phone dialers. ([source](https://www.30secondsofcode.org/react/components/p/1)) - [Scroll Locking](https://awesome-repositories.com/f/user-interface-experience/scroll-interaction-handlers/scroll-state-controllers/scroll-restoration/scroll-locking.md) — Prevents page body scrolling when modals or overlays are active. ([source](https://30secondsofcode.org/react/p/1)) - [Auto-Scrolling Carousels](https://awesome-repositories.com/f/user-interface-experience/scrolling-carousels/auto-scrolling-carousels.md) — Provides carousels that automatically cycle through items on a timer for featured content display. ([source](https://www.30secondsofcode.org/react/s/collapsable-content-components)) - [Partial State Merging](https://awesome-repositories.com/f/user-interface-experience/state-update-logic/partial-state-merging.md) — Provides logic for updating complex state objects by merging partial changes. ([source](https://www.30secondsofcode.org/react/s/advanced-react-state-hooks)) - [Media Query Observers](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/content-styling/css-utility-libraries/css-utilities/conditional-style-queries/document-media-queries/media-query-observers.md) — Evaluates CSS media queries at runtime to trigger reactive UI updates based on environment changes. ([source](https://www.30secondsofcode.org/react/s/window-global-environment-ssr-hooks)) - [Conditional Joining](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/content-styling/styling-architectures/styling-systems/class-based-styling/css-class-based-styling/conditional-joining.md) — Programmatically combines CSS class names based on truthy logic while filtering null values. ([source](https://www.30secondsofcode.org/react/p/2)) - [Tabbed Interfaces](https://awesome-repositories.com/f/user-interface-experience/tabbed-interfaces.md) — Implements components for organizing content into tabbed views with logic to track and switch the active index. ([source](https://www.30secondsofcode.org/react/s/collapsable-content-components)) - [URL State Synchronization](https://awesome-repositories.com/f/user-interface-experience/url-state-synchronization.md) — Synchronizes UI component state with browser URL query parameters and hashes for deep linking. ([source](https://www.30secondsofcode.org/react/s/use-request-animation-frame)) - [Viewport Visibility Observers](https://awesome-repositories.com/f/user-interface-experience/viewport-visibility-observers.md) — Tracks when elements enter or exit the user's field of view to trigger UI updates. ([source](https://www.30secondsofcode.org/react/p/2)) - [Callback Reference Memoization](https://awesome-repositories.com/f/user-interface-experience/virtual-rendering/rendering-optimizations/memoized-rendering/callback-reference-memoization.md) — Caches function references and computation results to prevent unnecessary child component updates. ([source](https://www.30secondsofcode.org/react/s/rendering))