Returns a subsequence containing all but the given number of initial elements.
SDK
- Xcode 11.0+
Framework
- Swift Standard Library
Declaration
func dropFirst(_ k: Int = 1) -> Slice<CollectionParameters
kThe number of elements to drop from the beginning of the collection.
kmust be greater than or equal to zero.
Return Value
A subsequence starting after the specified number of elements.
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.dropFirst(2))
// Prints "[3, 4, 5]"
print(numbers.dropFirst(10))
// Prints "[]"
Complexity: O(1) if the collection conforms to Random; otherwise, O(k), where k is the number of elements to drop from the beginning of the collection.