Untitled
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| Language | Swift |
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| Owner | w3xue |
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| Modified | |
| Visibility | Public |
struct Stack<Element> {
var items = [Element]()
mutating func push(_ item: Element) {
items.append(item)
}
mutating func pop() -> Element {
return items.removeLast()
}
}
extension Stack {
var topItem: Element? {
return items.isEmpty ? nil : items[items.count - 1]
}
}
var stackOfStrings = Stack<String>()
print("字符串元素入栈: ")
stackOfStrings.push("google")
stackOfStrings.push("W3xue")
if let topItem = stackOfStrings.topItem {
print("栈中的顶部元素是：\(topItem).")
}
print(stackOfStrings.items)
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