Generic stack data structure

stackDataStructure

public struct Stack<Element> {
    private var elements:[Element] = []
    
    public var isEmpty:Bool {
        peek() == nil
    }
    
    public init() { }
    
    public mutating func push(_ element:Element) {
        return self.elements.append(element)
    }
    
    @discardableResult public mutating func pop() -> Element? {
        return self.elements.popLast()
    }
    
    public func peek() -> Element? {
        return self.elements.last
    }
}