Stack structure in Swift

Stack.swift

struct Stack<T>: CustomStringConvertible {
    var description: String {
        let title = "==== Stack ==== \n"
        let body = self.array.map{ "\($0)" }.reversed().joined(separator: "\n")
        let end = "\n==============="
        return title + body + end
    }
    
    private var array: [T] = []
    
    mutating func push(_ item: T) {
        self.array.append(item)
    }
    
    mutating func pop() -> T? {
        return self.array.popLast()
    }
    
    func peek() -> T? {
        return self.array.last
    }
}

Example

var stringStack = Stack<String>()

stringStack.push("hello man")

stringStack.push("fuck")

print(stringStack)

stringStack.pop()

stringStack.peek()