Stack

public struct Stack<T>

Stack A stack is like an array but with limited functionality. You can only push to add a new element to the top of the stack, pop to remove the element from the top, and peek at the top element without popping it off. A stack gives you a LIFO or last-in first-out order. The element you pushed last is the first one to come off with the next pop. Push and pop are O(1) operations.

## Usage

 var myStack = Stack(array: [])
 myStack.push(10)
 myStack.push(3)
 myStack.push(57)
 myStack.pop() // 57
 myStack.pop() // 3

  • Indicates the number of values contained within the array object.

    Declaration

    Swift

    public var count: Int { get }

  • Indicates whether or not the array object contains zero (0) values.

    Declaration

    Swift

    public var isEmpty: Bool { get }

  • Pushes an item to the top of the stack.

    Declaration

    Swift

    public mutating func push(_ element: T)

    Parameters

    element

    The item being pushed.

  • Removes and returns the item at the top of the stack.

    Declaration

    Swift

    public mutating func pop() -> T?

    Return Value

    The item at the top of the stack.

  • top

    Returns the item at the top of the stack. This is otherwise known as peek.

    Declaration

    Swift

    public var top: T? { get }

  • Undocumented

    Declaration

    Swift

    public mutating func clear()

  • Indicates whether or not the array object contains zero (0) values.

    Declaration

    Swift

    public var isNotEmpty: Bool { get }