var list: [Int]? = [1, 2, 3]
// what's the best way to mutate list?
// this doesn't work:
if var x = list {
x.append(123)
}
print(list ?? "list is nil") // Optional([1, 2, 3])
// this work, but is there better way?
if let _ = list {
list?.append(44)
list!.append(44444)
}
print(list ?? "list is nil") // Optional([1, 2, 3, 44, 44444])
list?.append(123)
(There's no need for any check, since optional chaining will make it do nothing if it's nil.)
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