[swift-evolution] mandatory "?" suffix for identifiers associated with optional types

Amir Michail a.michail at me.com
Fri Dec 4 10:17:18 CST 2015

> On Dec 4, 2015, at 10:57 AM, Alex Blewitt <alex.blewitt at gmail.com> wrote:
>> On 4 Dec 2015, at 16:44, Amir Michail <a.michail at me.com <mailto:a.michail at me.com>> wrote:
>> I don’t want to remember if a variable is optional. I want to see it in the variable name.
> Optionality is associated with the type, not the identifier. In addition, how would you deal with type aliases to optional constructs?
> typealias MaybeString = String?
> var maybe:MaybeString
> This doesn’t ‘look’ like an optional value (so would it deserve a ? at the end) but if you have MaybeString? you now have an Optional<Optional<String>>. Should you have ?? there now?
> Alex

You would have:

typealias MaybeString? = String?
var maybe?:MaybeString?

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