[swift-evolution] [Discussion] What is the future of tuples in Swift?

Anton Zhilin antonyzhilin at gmail.com
Thu Mar 2 05:24:02 CST 2017

I think that tuples should remain what they are now. Static-length vectors
should be types on their own and interact with tuples, with structs and
with Array<…> in the same way.

newtype should be what enables extension of tuples:

newtype Money = (Int, Int)
extension Money: CustomStringConvertible {
    var description: String {
        return String(format: "$%d.%02d", arguments: [getSelfFirst,
let x = (0, 42)let y = x as Money  // errorprint(x.description)  // error
let z = Money(0, 42)print(z.description)  //=> $0.42

Here, getSelfFirst and getSelfSecond are placeholders for some syntax to
access the underlying type.
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