Master Svelte's reactive syntax, stores, and compile-time optimizations with practical interview questions
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Master writable, readable, and derived stores for state management
Learn how Svelte's compiler produces minimal, optimized JavaScript
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Svelte reactive syntax and declarations
Component props and slots
Stores (writable, readable, derived)
SvelteKit routing and SSR
Transitions and animations
Compile-time optimizations
A: Svelte's reactivity is compile-time, not runtime. Reactive statements use $: label syntax. When a variable changes, Svelte automatically updates dependent statements and DOM. No virtual DOM - updates compile to direct DOM manipulation. Example: $: doubled = count * 2 automatically recomputes when count changes.
A: Writable stores can be updated externally (set/update methods). Readable stores are read-only with internal logic controlling updates. Derived stores compute values from other stores. Use writable for app state, readable for external data sources (WebSocket), derived for computed values like totals or filtered lists.
A: Svelte is a compiler, not a framework shipped to browser. It compiles components to vanilla JavaScript at build time, eliminating framework overhead. No virtual DOM diffing code. Only includes code you actually use. Result: much smaller bundles and faster runtime performance than React/Vue.
A: Transitions animate elements entering/leaving DOM using transition: directive. Built-in: fade, fly, slide, scale. Can create custom transitions with CSS or JavaScript. Supports in/out variants for different enter/exit animations. Transitions are coordinated - intro waits for outro to complete.
Understand reactive declarations with $: and when they trigger
Practice with component lifecycle functions: onMount, onDestroy, beforeUpdate, afterUpdate
Know how to use slots for component composition
Master SvelteKit for full-stack applications with SSR
Understand the difference between Svelte's compiler approach vs runtime frameworks
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