Instance Method

popLast()

Removes and returns the last element of the collection.

Declaration

mutating func popLast() -> Character?

Return Value

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

Discussion

Calling this method may invalidate all saved indices of this collection. Do not rely on a previously stored index value after altering a collection with any operation that can change its length.

Complexity: O(1)

See Also

Removing Substrings

func remove(at: String.Index) -> Character

Removes and returns the character at the specified position.

func remove(at: Index) -> Character

Removes and returns the element at the specified position.

func removeAll(keepingCapacity: Bool)

Replaces this string with the empty string.

func removeAll(where: (Character) -> Bool)

Removes all the elements that satisfy the given predicate.

func removeFirst() -> Character

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() -> Character

Removes and returns the last element of the collection.

func removeLast(Int)

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

func removeSubrange(Range<String.Index>)

Removes the characters in the given range.

func removeSubrange(Range<Index>)

Removes the elements in the specified subrange from the collection.

func removeSubrange<R>(R)

Removes the elements in the specified subrange from the collection.

func filter((Character) -> Bool) -> String

Returns a new collection of the same type containing, in order, the elements of the original collection that satisfy the given predicate.

func drop(while: (Character) -> Bool) -> Substring

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

func dropFirst(Int) -> Substring

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

func dropLast(Int) -> Substring

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