append(_:)
Appends a new member to the end of the set, if the set doesn’t already contain it.
Declaration
@discardableResult mutating func append(_ item: MarkupOrderedSet.Element) -> (inserted: Bool, index: Int)Parameters
- item:
The element to add to the set.
Return Value
A pair (inserted, index), where inserted is a Boolean value indicating whether the operation added a new element, and index is the index of item in the resulting set.