快速展开多个可选

Question

我认为这是可能的，但似乎无法让它发挥作用。我确定我只是在装傻。我试图以

的形式输出格式化地址

"one, two, three"

来自一组可选组件(一、二、三)。如果“二”为零，则输出为

“一、三”

let one: String?
let two: String?
let three: String?

one = "one"
two = nil
three = "three"

if let one = one,
        two = two,
        three = three {
     print("\(one),\(two),\(three)")
}

Answer 1

我不知道你为什么需要这个，但接受它 =)

if let _ = one ?? two ?? three {
    print("\(one),\(two),\(three)")
}