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Add array examples to reactive variable documentation #10235

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merged 3 commits into from
Nov 21, 2022
Merged

Add array examples to reactive variable documentation #10235

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c56e352
Add troubleshooting tips to the reactive var documentation.
larrymyers Oct 27, 2022
b888e66
Updates from PR review:
larrymyers Nov 15, 2022
a28a84d
Remove troubleshooting section, update Modifying section with more co…
larrymyers Nov 18, 2022
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12 changes: 8 additions & 4 deletions docs/source/local-state/reactive-variables.mdx
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Expand Up @@ -40,15 +40,19 @@ To modify the value of your reactive variable, call the function returned by `ma

```js
const cartItemsVar = makeVar([]);
const cartItemIds = [100, 101, 102];

cartItemsVar([100, 101, 102]);
cartItemsVar(cartItemIds);

// Output: [100, 101, 102]
console.log(cartItemsVar());

cartItemsVar([456]);
// Don't mutate an existing object or array.
// cartItemIds.push(456) will not trigger an update.
// Instead, pass a new copy:
cartItemsVar([...cartItemIds, 456]);

// Output: [456]
// Output: [100, 101, 102, 456]
console.log(cartItemsVar());
```

Expand Down Expand Up @@ -77,4 +81,4 @@ export function Cart() {

## Example application

[This example to-do list application](https://github.com/apollographql/ac3-state-management-examples/tree/master/apollo-local-state) uses reactive variables to track both the current list of to-do items and the filter that determines which items to display. See [`cache.tsx`](https://github.com/apollographql/ac3-state-management-examples/blob/master/apollo-local-state/src/cache.tsx) in particular.
[This example to-do list application](https://github.com/apollographql/ac3-state-management-examples/tree/master/apollo-local-state) uses reactive variables to track both the current list of to-do items and the filter that determines which items to display. See [`cache.tsx`](https://github.com/apollographql/ac3-state-management-examples/blob/master/apollo-local-state/src/cache.tsx) in particular.