Returns a sequence containing all but the given number of final elements.
SDK
- Xcode 10.2+
Framework
- Swift Standard Library
Declaration
func dropLast(_ k: Int = 1) -> [Self.Element]
Parameters
nThe number of elements to drop off the end of the sequence.
nmust be greater than or equal to zero.
Return Value
A sequence leaving off the specified number of elements.
Discussion
The sequence must be finite. If the number of elements to drop exceeds the number of elements in the sequence, the result is an empty sequence.
let numbers = [1, 2, 3, 4, 5]
print(numbers.dropLast(2))
// Prints "[1, 2, 3]"
print(numbers.dropLast(10))
// Prints "[]"
Complexity: O(n), where n is the length of the sequence.