Instance Method

popFirst()

Removes and returns the first element of the collection.

Declaration

mutating func popFirst() -> Self.Element?
Available when Self is SubSequence.

Return Value

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

Discussion

Complexity: O(1)

See Also

Selecting and Excluding Elements

func removeFirst() -> Self.Element

Removes and returns the first element of the collection.

Available when Self is SubSequence.
func removeFirst(Int)

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

Available when Self is SubSequence.