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
k elements from 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(k), where k is the number of elements to drop.