Learn SVELTE with Real Code Examples
Updated Nov 21, 2025
Architecture
Compile-time reactive framework
Component-based structure
No virtual DOM - direct DOM updates
Built-in store-based state management
Optional server-side rendering with SvelteKit
Rendering Model
No virtual DOM
DOM updates generated by compiler
Reactive variable access triggers rendering
Hydration available via SvelteKit
Optimized diffing at build time
Architectural Patterns
Store-based state management
Component composition via slots
Reactive statements and declarations
SSR/SPA/SSG via SvelteKit
Endpoint-driven backend integration
Real World Architectures
SvelteKit SaaS apps
Interactive dashboards
E-commerce SPAs
Marketing landing pages
Design systems with reusable components
Design Principles
Compile-time optimization
Minimal runtime cost
Human-readable and predictable code
Component-driven architecture
Built-in animations and transitions
Scalability Guide
Use modules and stores for large state
Lazy-load SvelteKit routes
Split reusable components into `src/lib`
Optimize server endpoints
Monitor build output and bundle size
Migration Guide
Move from Svelte 2 -> 3 using new reactivity
Refactor `.html` files to `.svelte` components
Adopt SvelteKit for routing and SSR
Update transitions to new syntax
Test stores and reactive blocks thoroughly