Adds an element to the end of the collection.
Required. Default implementation provided.
- Xcode 10.0+
- Swift Standard Library
The element to append to the collection.
If the collection does not have sufficient capacity for another element, additional storage is allocated before appending
new. The following example adds a new number to an array of integers:
Complexity: O(1) on average, over many calls to
append(_:) on the same collection.