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docs: explain signal object and array updates #1627

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docs: explain signal object updates
dongyikuan919 Aug 12, 2026
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Merge branch 'main' into agent/document-signal-object-updates
kodiakhq[bot] Aug 12, 2026
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11 changes: 11 additions & 0 deletions src/routes/(0)concepts/(2)signals.mdx
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Expand Up @@ -72,6 +72,17 @@ setCount((prevCount) => prevCount + 1);
console.log(count()); // output: 1
```

When a signal contains an object or array, mutating it directly does not notify subscribers because the setter was not called.
Use the setter to create a new object or array instead:

```jsx
const [items, setItems] = createSignal(["apple", "banana"]);

setItems((currentItems) => [...currentItems, "cherry"]);
```

For state that requires frequent nested updates, consider using a [store](/concepts/stores) instead.

## Reactivity

Signals are reactive, which means that they automatically update when their value changes.
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