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# updateOrAppend(_:)

Adds the given element to the set unconditionally, either appending it to the set, or replacing
an existing value if one with the same id is present.

```
@discardableResult mutating func updateOrAppend(_ item: MarkupOrderedSet.Element) -> MarkupOrderedSet.Element?
```

## Parameters

`item`

The value to append or replace.

## Return Value

The element this operation replaced, or `nil` if the operation appended the value to the end of the collection.

---

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