Returns a subsequence containing all but the specified number of final elements.
SDK
- Xcode 8.0+
Framework
- Swift Standard Library
Declaration
func dropLast(_ k: Int) -> ArrayParameters
kThe number of elements to drop off the end of the collection.
kmust be greater than or equal to zero.
Return Value
A subsequence that leaves off k elements from the end.
Discussion
If the number of elements to drop exceeds the number of elements in the collection, the result is an empty subsequence.
let numbers = [1, 2, 3, 4, 5]
print(numbers.dropLast(2))
// Prints "[1, 2, 3]"
print(numbers.dropLast(10))
// Prints "[]"
Complexity: O(1) if the collection conforms to Random; otherwise, O(k), where k is the number of elements to drop.