Instance Method

popFirst()

Removes and returns the first element of the collection.

Declaration

mutating func popFirst() -> Bound?

Return Value

The first element of the collection if the collection is not empty; otherwise, nil.

Discussion

Complexity: O(1)

See Also

Excluding Elements

func dropFirst(Int) -> Range<Bound>

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