Learn SVELTE with Real Code Examples

Svelte allows developers to build reactive and component-driven interfaces with minimal boilerplate.

It compiles code at build time, eliminating the need for a virtual DOM.

Svelte prioritizes performance, simplicity, and a clean development experience.

Reactive assignments (`count += 1` updates UI)

Svelte stores (`writable`, `readable`, `derived`)

Component scoping with `<script>`, `<style>`, `<template>` style syntax

Lifecycle hooks (`onMount`, `beforeUpdate`, `afterUpdate`, `onDestroy`)

Animations, transitions, and motion primitives

Reactive variables

Props passing

Bindings (`bind:value`)

Logic blocks (`{#if}`, `{#each}`, `{#await}`)

Stores and subscriptions

src/ - main source code

src/routes/ - SvelteKit routing

src/lib/ - components and utilities

static/ - static assets

svelte.config.js - framework config

Create `.svelte` component files

Write reactive JS inside `<script>`

Use HTML-based templates

Style with scoped `<style>`

Run project with hot module replacement

Beginner: component-based UI widgets

Intermediate: small SPAs

Advanced: SvelteKit SSR apps

Expert: custom stores & transitions

Community: contributing to SvelteKit plugins

Faster than React/Vue due to compile-time model

Less boilerplate than Angular

Simpler reactivity vs Vue’s computed/watchers

SvelteKit provides full-stack tools like Next.js

Great for performance-focused applications

2016 – Svelte initial release

2018 – Svelte 2 with improvements

2019 – Svelte 3 with new reactivity model

2022 – SvelteKit 1.0 released

2024–2025 – Continued SvelteKit ecosystem expansion

Reactive Declaration: Code marked with `$:` that auto-updates

Store: Reactive global state object

Transition: Built-in animation effect

Slot: Placeholder for child content

Adapter: SvelteKit deployment transformer