You can do it today (2.2 and 3.0-master) like this:
switch cityIDs["Paris"] {
case let .Some(parisCityID) where 0..<10 ~= parisCityID:
print("Paris city ID: \(parisCityID)")
default:
break
}
> On May 27, 2016, at 1:58 AM, Natthan Leong via swift-evolution
> <[email protected]> wrote:
>
> Hi there,
>
> I was wondering if the community would like Swift to have a switch statement
> with optional binding.
>
> Take this simple dictionary as an example:
>
> let cityIDs = ["Paris": 1, "London": 2]
>
> Currently, this is how things are done if parisCityID is used only once
> within an if-let statement for only a switch statement:
>
> if let parisCityID = cityIDs["Paris"] {
> switch parisCityID {
> case 0..<10:
> print("Paris city ID: \(parisCityID)")
> default:
> break
> }
> }
>
> And here is the proposed switch statement with optional binding:
>
> switch let parisCityID = cityIDs["Paris"] {
> case 0..<10:
> print("Paris city ID: \(parisCityID)")
> default:
> break
> }
>
> With var:
>
> switch var parisCityID = cityIDs["Paris"] {
> case 0..<10:
> parisCityID += 2 // just to demonstrate var
> print("Paris city ID: \(parisCityID)")
> default:
> break
> }
>
> Feedback welcomed!
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