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docs: Add proxy behavior example to Deep State tutorial #1715

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12 changes: 12 additions & 0 deletions apps/svelte.dev/content/tutorial/01-svelte/02-reactivity/02-deep-state/index.md
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Expand Up @@ -30,3 +30,15 @@ function addNumber() {
```

> [!NOTE] Deep reactivity is implemented using [proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy), and mutations to the proxy do not affect the original object.
>
> **Example:**
> ```js
> let original = [1, 2, 3, 4];
> let numbers = $state(original);
> // Now you have TWO separate things:
> // 1. `numbers` - the reactive proxy (triggers UI updates)
> // 2. `original` - the non-reactive original array
>
> numbers.push(5); // ✅ UI updates! numbers is now [1,2,3,4,5]
> console.log(original); // ❌ Still [1,2,3,4] - unchanged!
> ```