Returns a subsequence containing all but the specified number of final elements.
- Xcode 8.0+
- Swift Standard Library
The number of elements to drop off the end of the collection.
kmust be greater than or equal to zero.
A subsequence that leaves off the specified number of elements at the end.
If the number of elements to drop exceeds the number of elements in the collection, the result is an empty subsequence.
Complexity: O(1) if the collection conforms to
Random; otherwise, O(n), where n is the length of the collection.