> For the complete documentation index, see [llms.txt](https://standard-resource.js.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://standard-resource.js.org/groups/updating.md).

# Updating

Use [`store.update()`](/api-reference/store.md#update-path-changes-options) and [`store.remove()`](/api-reference/store.md#remove-path-changes) to update groups. The following operations are possible:

Using `update()`:

* replace the contents of a group
* append new items to the end of a group

Using `remove()`:

* remove resource(s) from a group

> Heads up: you can also delete an entire group using either `update()` or `remove()`. This is covered in the next guide, [Deleting Groups](/groups/deleting.md).

## Replacing a Group

Replacing the contents of a group is straightforward: it looks the exact same as the call to create a group. In this example, we replace our `selectedBooks` group with a different set of IDs:

```javascript
const newSelectedBooks = store.getResources('books', [50, 24]);

store.update('groups.selectedBooks', newSelectedBooks);
```

## Appending to a Group

Sometimes, you want to add a new value to a group without losing the old values. Once again, you use `store.update()` for this purpose. One of the options to `store.update()` is called `concatGroups`. Pass it as `true`, and the IDs will be added to the group.

```javascript
store.update('groups.selectedBooks', [{ id: 2, resourceType: 'books' }], {
  concatGroups: true,
});
```

## Removing Resources From a Group

To remove resources from a group, you can use `store.remove()`. The arguments are the same as adding a resource to the group.

```javascript
store.remove('groups.selectedBooks', [
  { id: 50, resourceType: 'books' },
  { id: 24, resourceType: 'books' },
]);
```

## Updating Multiple Groups

The previous examples used the `path` argument to `store.update()` to update a single group. But you can update as many groups across as many resources at a single time using these methods. In this example, we perform a bulk operation to replace several groups at the same time:

```javascript
store.update({
  groups: {
    selectedBooks: [{ id: 2, resourceType: 'books' }],
    favoriteBooks: [
      { id: 2, resourceType: 'books' },
      { id: 10, resourceType: 'books' },
      { id: 55, resourceType: 'books' },
    ],
    favoriteMovies: [],
  },
});
```

## Tips

* Resources that don't exist at the time that you add them to a group will be created for you. This is

  useful if you need to create a resource and add it to a group at the same time.