Implement Generic Stack Swift5

How to implement Generic stack in iOS/Swift

//----------------------Generic Stack----------------------//

struct Stack<T> {

    private var stackArr: [T]

    init() { stackArr = [] }

    var isEmpty : Bool { return stackArr.count == 0 }

    var tos : T? { return isEmpty ? nil : stackArr.last }

    mutating func push(_ data: T){ stackArr.append(data) }

    mutating func pop() { if isEmpty { return; }; stackArr.removeLast(); }

}

//----------------------Generic Stack----------------------//

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