??.swift

test("Optional Binding") {
    for _ in 0...repeatCount {
        let unrapped: String
        if let tmp = s {
            unrapped = tmp
        } else {
            unrapped = "default"
        }
    }
}

test("??") {
    for _ in 0...repeatCount {
        let unrapped = s ?? "default"
    }
}