Applies the given difference to this collection.
- iOS 13.0+
- macOS 10.15+
- tvOS 13.0+
- watchOS 6.0+
func applying(_ difference: CollectionDifference<Self.Element>) -> Self?
The difference to be applied.
An instance representing the state of the receiver with the difference applied, or
nil if the difference is incompatible with the receiver’s state.