Instance Method

dropFirst(_:)

Returns a subsequence containing all but the given number of initial elements.

Declaration

func dropFirst(_ k: Int = 1) -> Range<Bound>
Available when Bound conforms to Strideable and Bound.Stride conforms to SignedInteger.

Parameters

k

The number of elements to drop from the beginning of the collection. k must 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 RandomAccessCollection; otherwise, O(k), where k is the number of elements to drop from the beginning of the collection.

See Also

Excluding Elements

func dropLast(Int) -> Range<Bound>

Returns a subsequence containing all but the specified number of final elements.

func drop(while: (Bound) -> Bool) -> Range<Bound>

Returns a subsequence by skipping elements while predicate returns true and returning the remaining elements.

func popFirst() -> Bound?

Removes and returns the first element of the collection.

func popLast() -> Bound?

Removes and returns the last element of the collection.

func removeFirst() -> Bound

Removes and returns the first element of the collection.

func removeFirst(Int)

Removes the specified number of elements from the beginning of the collection.

func removeLast() -> Bound

Removes and returns the last element of the collection.

func removeLast(Int)

Removes the given number of elements from the end of the collection.