Stack

public struct Stack<Element>
extension Stack: Collection
extension Stack: CustomDebugStringConvertible where Element: CustomDebugStringConvertible

A basic stack type implementing the LIFO principle - only the last inserted element can be accessed and removed.

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  • Creates an empty Stack.

    Declaration

    Swift

    public init()
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  • The number of elements in this stack.

    Declaration

    Swift

    public var count: Int { get }
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  • Pushes (appends) an element onto the stack.

    Declaration

    Swift

    public mutating func push(_ element: Element)

    Parameters

    element

    The element to push onto the stack.
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  • Removes and returns the last element of the stack.

    Declaration

    Swift

    @discardableResult
public mutating func pop() -> Element?

    Return Value

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

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  • Returns the last element of the stack if the stack is not empty; otherwise, nil.

    Declaration

    Swift

    public func peek() -> Element?
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  • Check whether the sequence contains an element that satisfies the given predicate.

    Declaration

    Swift

    public func contains(where predicate: (Element) -> Bool) -> Bool

    Parameters

    predicate

    A closure that takes an element of the sequence and returns whether it represents a match.

    Return Value

    true if the sequence contains an element that satisfies predicate.

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  • Modify the last element.

    Declaration

    Swift

    public mutating func modifyLast(by modifier: (inout Element) -> Void)

    Parameters

    modifier

    A function to be applied to the last element to modify the same in place.
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  • Declaration

    Swift

    public var startIndex: Int { get }
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  • Declaration

    Swift

    public var endIndex: Int { get }
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  • Declaration

    Swift

    public subscript(position: Int) -> Element { get }
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  • Declaration

    Swift

    public func index(after index: Int) -> Int
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Available where Element: CustomDebugStringConvertible