Subscribing with $ Auto-subscription
Use the $ prefix to auto-subscribe and auto-unsubscribe from stores in components.
Subscribing with $ Auto-subscription is a free Sveltejs Academy lesson on CoddyKit. This is lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, and your progress syncs across the web and the CoddyKit app. The Sveltejs Academy course includes 4 lessons in total.
The $ Prefix
Prefix a store with $ inside a component to auto-subscribe and read its value.
<script>
import { count } from "./stores";
</script>
<p>{$count}</p>Auto-Unsubscribe
Svelte unsubscribes automatically when the component is destroyed. No memory leaks.
Compile-Time Magic
The compiler rewrites $count into the proper subscribe/unsubscribe boilerplate at build time.
Assigning to $store
You can also assign: $count = 5 is shorthand for count.set(5).
Updating $store
Operators like $count++ work, calling set with the new value under the hood.
Component-Only
The $ shorthand is only valid inside .svelte files. In plain .js use get(store) or subscribe.
Inside Reactive Statements
$store values are reactive, so they trigger $: declarations.
$: doubled = $count * 2;Inside Markup
Use {$store} wherever you would interpolate a regular variable.
Multiple Stores
Auto-subscribe to as many stores as you need; each is tracked independently.
Avoid Side Effects in $
The $ shorthand is for reading and assigning. Do not put complex logic inline.
Performance
Auto-subscription costs almost nothing per component. Use freely for shared state.
Quick Check
What does $count do in a Svelte component?
Recap
The $store shorthand reads, writes, and auto-cleans subscriptions. Use it everywhere inside .svelte files.
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Frequently Asked Questions
Is the “Subscribing with $ Auto-subscription” lesson free?
Yes — the full text of “Subscribing with $ Auto-subscription” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO. The Sveltejs Academy course includes 4 lessons in total.
What will I learn in “Subscribing with $ Auto-subscription”?
Use the $ prefix to auto-subscribe and auto-unsubscribe from stores in components. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 4.
How long does the “Subscribing with $ Auto-subscription” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Creating a writable Store
- Subscribing with $ Auto-subscription
- Updating Stores: set() and update()
- readable Stores and Custom Start Functions