"guard" statement in Swift
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class Stack<T> {
var items: [T?] = [T?]()
func push(item: T) {
items.append(item)
}
func pop() -> T? {
guard items.count > 0 else {
return nil
}
return items.removeLast()
}
}
let stack = Stack<Int>()
stack.push(1)
let n1 = stack.pop()
//n1 is Optional(1)
let n2 = stack.pop()
//n2 is nil
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