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Brian Vaughn
2017-11-17 10:09:21 -08:00
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content/docs/lists-and-keys.md
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@@ -130,7 +130,7 @@ const todoItems = todos.map((todo, index) =>
);
```
We don't recommend using indexes for keys if the items can reorder as that would impact performance, and may cause issues with the reordering of components and their respective states. If you choose not to assign a key to your list items then React will use indexes as keys. You may read an [in-depth explanation about why keys are necessary](/docs/reconciliation.html#recursing-on-children) if you're interested in more information.
We don't recommend using indexes for keys if the order of items may change. This can negatively impact performance and may cause issues with component state. If you choose not to assign a key to your list items then React will use indexes as keys. You may read an [in-depth explanation about why keys are necessary](/docs/reconciliation.html#recursing-on-children) if you're interested in more information.
### Extracting Components with Keys