Patterns.dev

Teaches Vite-specific bundle optimization patterns. Use when configuring Vite builds, code splitting, managing dependencies, or troubleshooting slow Vite builds.

Teaches virtual list (windowing) techniques for rendering large datasets. Use when rendering lists or tables with hundreds or thousands of items that cause scroll jank or slow initial render.

Teaches the View Transitions API for animating DOM changes. Use when you want smooth animated transitions between pages or UI states without manual animation code.

Teaches tree shaking for dead code elimination in JavaScript bundles. Use when your bundle includes unused exports and you want to reduce the final bundle size during the build step.

Teaches strategies for mitigating third-party script performance impact. Use when third-party scripts like analytics, ads, or widgets are degrading your page load times or Core Web Vitals.

Teaches streaming server-side rendering for chunked HTML delivery. Use when you need faster Time to First Byte and First Contentful Paint by streaming HTML as it's generated on the server.

Teaches static rendering (SSG) for build-time HTML generation. Use when your pages don't change per request and can be pre-rendered at build time for maximum cacheability and performance.

Teaches static ES2015 import syntax for module dependencies. Use when you need to import code that is required at load time and benefits from static analysis and tree shaking.

Teaches Vue state management with stores, Pinia, and the Composition API. Use when you need to share and synchronize state across multiple components beyond what props and events can handle.

Teaches the singleton pattern for managing a single shared instance. Use when exactly one instance of a class or object is needed to coordinate actions across your application.

Teaches server-side rendering (SSR) for React applications. Use when you need faster initial page loads, better SEO, or dynamic per-request HTML generation.

Teaches Vue's script setup syntax for concise Composition API usage. Use when writing Vue 3 single-file components and you want a more ergonomic, less boilerplate syntax for the Composition API.

Teaches route-based code splitting for single-page applications. Use when different routes load distinct feature sets and you want to avoid loading all route code upfront.

Teaches the renderless component pattern for logic-only Vue components. Use when you want to encapsulate behavior without dictating markup, letting consumers control rendering via scoped slots.

Teaches the render props pattern for flexible component composition. Use when you need to share rendering logic between components by passing a function that returns JSX as a prop.

Teaches Vue render functions and JSX for programmatic template creation. Use when templates are too limiting and you need the full power of JavaScript to construct component output dynamically.

Teaches React Server Components for zero-bundle server rendering. Use when components only need server-side data access and don't require client-side interactivity like state or event handlers.

Teaches selective hydration combined with streaming SSR in React 18+. Use when you need to prioritize hydrating interactive components while streaming the rest of the page.

Teaches React rendering performance optimization patterns. Use when reducing unnecessary re-renders, optimizing memoization, improving state design, or diagnosing React performance issues.

Teaches modern React data fetching patterns with TanStack Query, SWR, and Suspense. Use when implementing caching, deduplication, optimistic updates, or parallel loading in React applications.

Teaches modern React composition patterns for 2025/2026. Use when designing component APIs, building shared UI libraries, or refactoring prop-heavy components.

Provides a comprehensive guide to the modern React 2026 stack. Use when starting a new React project or modernizing an existing one with current frameworks, build tools, routing, state management, or AI integration.

Teaches the PRPL pattern for optimizing initial page load. Use when building Progressive Web Apps or when you need to push critical resources, render the initial route, pre-cache remaining routes, and lazy-load on demand.

Teaches the proxy pattern for intercepting object operations. Use when you need validation, logging, formatting, or access control on property access, assignment, or function invocation.

Teaches the provider pattern for sharing data across component trees. Use when multiple nested components need access to the same data and prop drilling becomes unwieldy.

Teaches Vue's provide/inject API for dependency injection across components. Use when deeply nested components need access to ancestor data without threading props through intermediate layers.

Teaches the prototype pattern for property sharing via the prototype chain. Use when creating many objects of the same type that should share methods or properties efficiently.

Teaches progressive hydration for prioritized client-side interactivity. Use when server-rendered pages have non-critical sections whose JavaScript can be deferred to improve Time to Interactive.

Teaches the presentational/container pattern for separating view and logic. Use when you want to isolate data fetching and business logic from UI rendering for better testability and reuse.

Teaches resource preloading to prioritize critical assets. Use when critical resources like fonts, hero images, or key scripts are discovered late in the loading waterfall.

Teaches resource prefetching strategies for faster navigation. Use when you can predict which resources the user will need next and want to load them during idle time.

Teaches the observer pattern for event-driven communication. Use when you need decoupled publish/subscribe behavior where multiple parts of your system react to state changes or events.

Teaches the module pattern for code organization and encapsulation. Use when structuring JavaScript into reusable, maintainable pieces with clear public and private boundaries.

Teaches the mixin pattern for sharing functionality without inheritance. Use when you need to add reusable behavior to multiple objects or classes that don't share a common ancestor.

Teaches the mediator pattern for centralized component communication. Use when multiple components need to communicate and direct coupling between them creates complexity or tight dependencies.

Teaches resource loading sequence optimization for Core Web Vitals. Use when you need to improve FCP, LCP, or FID by reordering how critical resources are discovered and loaded.

Provides framework-agnostic JavaScript runtime performance patterns. Use when optimizing hot paths, loops, DOM operations, caching, or data structure choices in performance-critical code.

Teaches the islands architecture pattern for partial hydration. Use when building content-heavy sites where most of the page is static and only small regions need interactivity.

Teaches Incremental Static Regeneration (ISR) for updating static content post-build. Use when you have static pages that need periodic updates without a full site rebuild.

Teaches visibility-based lazy loading using Intersection Observer. Use when you have below-the-fold components or images that don't need to load until the user scrolls to them.

Teaches interaction-based lazy loading for non-critical resources. Use when you have heavy components or libraries that are only needed after user interaction like clicks, hovers, or form input.

Teaches React Hooks for reusing stateful logic across components. Use when extracting shared behavior like form handling, subscriptions, or side effects into reusable custom hooks.

Teaches the Higher-Order Component (HOC) pattern for logic reuse. Use when you need to share cross-cutting concerns like authentication, logging, or data fetching across multiple components.

Teaches the flyweight pattern for memory optimization. Use when your application creates large numbers of similar objects and memory consumption is a concern.

Teaches the factory pattern for flexible object creation. Use when you need to create objects dynamically without using the new keyword or when object creation logic should be centralized.

Teaches dynamic import() for on-demand code loading. Use when you need to reduce initial bundle size by lazily loading modules that aren't required at startup.

Teaches dynamic component switching with Vue's <component> element. Use when you need to render different components conditionally based on runtime state using the is attribute.

Teaches the data provider pattern using renderless components and scoped slots. Use when you need to abstract data fetching or state management logic and expose it to child components via slots.

Teaches the container/presentational pattern for Vue components. Use when you want to separate data fetching and business logic from presentation for better testability and reuse.

Teaches JavaScript compression techniques including Gzip and Brotli. Use when optimizing network transfer times or configuring server-side compression for production builds.

Teaches the compound component pattern for shared implicit state. Use when building related components like tabs, accordions, or dropdowns that need to coordinate without explicit prop passing.

Teaches Vue composables for reusable stateful logic with the Composition API. Use when extracting shared reactive state, side effects, or computed logic that multiple components need.

Teaches Vue component fundamentals including markup, logic, and styles. Use when building or structuring Vue single-file components as the foundational building blocks of your application.

Teaches the command pattern for decoupling task execution from invocation. Use when you need undo/redo functionality, queued operations, or want to decouple the object that invokes an operation from the one that performs it.

Teaches client-side rendering (CSR) for React applications. Use when building highly interactive apps where SEO is not a priority and the UI is driven by user actions.

Teaches bundle splitting techniques for web performance. Use when your application has a large JavaScript bundle that affects load times or when you need to reduce FCP/LCP.

Teaches async component loading in Vue for performance optimization. Use when you have heavy components that aren't needed on initial render and can be loaded on demand.

Teaches design patterns for building AI-powered React interfaces. Use when creating chatbots, intelligent assistants, streaming UIs, or any AI-driven user experience in React.